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SS6781B
Battery Charge Controller
FEATURES
Fast Charge Control of NiMH/NiCd Batteries, even with a Fluctuating Charging Current. Fast Charge Termination by: T / t , -V , 0 V , Safety Timer, Maximum Temperature, Maximum Voltage. Linearly Adjustable T / t Detection Slope and Safety Timer. Adjustable Peak Voltage Timer for 0 V . Battery Voltage Protection Range Selectable. Selectable Battery Temperature Protection Mode. Protection against Battery Voltage and Battery Temperature Faults. Selectable LED Display Mode for Battery Status. Five Pulsed Trickle Charge Modes. Discharge-before-Charge Function Available for Eliminating Memory Effect. Quick and Easy Testing for Production. 16-pin DIP or SO Packages.
DESCRIPTION
The SS6781B fast charge controller IC is designed for intelligent charging of NiMH or NiCd batteries without the risk of overcharge. -V Detection (-0.25%), 0 V detection (peak voltage timer) and T / t detection are the primary methods employed by the SS6781B to terminate fast charge. The fast charge can also be cut off by maximum battery voltage and maximum battery temperature detection along with the safety timer to prevent charging under fault conditions of the charging system or the battery itself. Both T / t and -V detection methods have been proved powerful in terminating fast charging for NiMH and NiCd batteries. The SS6781B utilizes the combination of these two methods to achieve reliable decision of ending fast charge and prevent misacting caused by using -V detection alone under certain conditions. Fig. 1 shows an example of charging curve of a battery charged by a fluctuating current from a NiMH battery charger, which uses the SS6781B controller IC to achieve optimal charging. This technique, in cooperating with the 0 V detection (peak voltage timer), is particularly suitable for NiMH batteries, whose voltage drop is hardly significant yet temperature rises rapidly. The T / t or -V detection circuitry may be disabled independently for different applications, such as system-integrated chargers, chargers with varying charge current, or battery packs lack of temperature sensing thermistor. The safety timer period, mode of battery temperature protection, battery voltage protection range, pulsed trickle charge duty, and LED display mode are all adjustable or selectable. Discharge-before-charge function is included to get rid of memory effect of NiCd batteries without
APPLICATIONS
Battery Fast Chargers for: Mobile Phones. Notebook and Laptop Personal Computers. Portable Power Tools and Toys. Portable Communication Equipments. Portable Video & Stereo Equipments.
1.55 100
Charge Current = 600 mA Cell Capacity = 550 mA NiMH Battery
Cell Voltage
1.35
60
1.25
40
Temperature
1.15 0 10 20 30 40 50 60 20
Charge Time (min.)
Fig. 1 Battery Charging Characteristics Resulting from an SS6781B-Controlled Charger with a Fluctuating Charging Current
Pb-free; RoHS-compliant
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Temperature (C)
Cell Voltage (V)
1.45
80
SS6781B
the risk of overdischarging. Test mode is provided for charger manufactures to dramatically reduce production test time.
TYPICAL APPLICATION CIRCUIT
D1 R1 1K L1 220H R5 120/0.5W U1 DC DE CF GND SS6563 BOOST IS VCC FB 8 7 6 5 + C4 220F 1N5819 D2 IN5819 R2 20/5W R3 270 LED1 R8 300K + R9 91K BAT1 **BATTERY R7 RX
THERMISTOR
SW1 PB SW YELLOW LED2 R12 100K DSW ICON LED2 LED1 GND SEL1 SEL2 MODE 16 15 14 13 12 11 10 9 R16 680 GREEN RED R17 680 LED3
IN4148 C2 1F
C5
R10 100K C10 47nF
1 2
U2
PEAK VBT DIS VTS VCC ADJ SEL3 TMR
0.1F
R4 390K
1 2 3
D3 IN4148 RS 0.3/1W + C3
D4
C9
4.7F
C7 0.1F
Q1
MPS2222A
R15 680
3 4 5 6
C1 470P
4
R14 + C11 C8 200K R6 50K R11
7 8
220F
RY
C6 0.1F
100F R13 470K
0.1F
SS6781B
5.1K
VIN 11~15V
+
U3 VIN C12 1F
78L05 VOUT GND Q2 MMBT2222A
+
C13 10F
**3~5 NiMH/NiCd cells. Note: Charge Current=0.3/RS Ampere Safety Timer: 80min
Battery Charge Circuit for Fluctuating Charging Current Application
ORDERING INFORMATION
SS6781BXXXX
PIN CONFIGURATION PACKING TYPE TR: TAPE & REEL TB: TUBE PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE C: COMMERCIAL G: LEAD FREE COMMERCIAL TOP VIEW
PEAK VBT DIS VTS VCC ADJ SEL3 TMR
1 2 3
4
16 15 14 13 12
DSW ICON LED2 LED1 GND
5 6 7
8
11 SEL1 10 9
SEL2 MODE
Example: SS6781BCSTR in SO-16 Package & Tape & Reel Packing Type (CN is not available in TR packing type) SS6781BGSTR in SO-16 Lead Free Package & Tape & Reel Packing Type
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SS6781B
ABSOLUTE MAXIMUM RATINGS
Supply Voltage DC Voltage Applied on any pin Sink current of ICON pin, LED1 and LED2 pin Operating Temperature Range Storage Temperature Range Junction Temperature Range Lead Temperature (Soldering 10 sec) 5.5V 5.5V 20mA -40C~ 85C -65C~ 150C 125C 260C
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
VCC VOLTAGE SOURCE + YELLOW R1 560 PEAK VBT DIS VTS DSW ICON LED2 LED1 R3 560 R4 560 R5 560 GND SEL1 SEL2 MODE VCC VCC VCC VCC RED GREEN ORANGE
-
+
VOLTAGE SOURCE VCC (5V) VCC V1 (0.95V) V2 (3V) 5.1K R2
SS6781B
VCC ADJ SEL3 TMR
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SS6781B
ELECTRICAL CHARACTERISTICS (TA=25C, VCC=5V, unless otherwise specified.)
(Note1) PARAMETER Supply Voltage Supply Current Battery Low During Initial Timer After Initial Timer (SEL3>3V) (SEL3<2V) Battery High (SEL3>3V) (SEL3<2V) Temperature High Temperature Sense Limit Output impedance of DIS Pin LED1, LED2, ICON pins Output Impedance ON OFF Source Current Capability SEL3 pin DSW pin MODE, PEAK, SEL1, SEL2 pins VBT, VTS, ADJ pins Recommended External Resistor of TMR pin Battery Charge Current (Note2, Note3, Note4) Temperature detective function is enabled. Battery's type is GP180AAHC w.r.t. RTMR 1 0.9 5.1 27 ISEL3 IDSW 1 5.5 90 300 25 50 M A Temperature Low VTS ZDIS TEST CONDITIONS SYMBOL VCC ICC MIN. 4.5 TYP. 5.0 1.1 MAX. 5.5 UNIT V mA
0.11 VBT 0.63 1.1 2.6 1.9 1.35 3.5
0.16 0.69 1.2 2.7 2.0 1.45 3.6 50
0.21 0.75 1.30 2.80 2.10 1.55 3.70 100 V V
Voltage Protection Limit
Input Impedance
k M k
0.25
0.8
1
C
-V Detection Peak Value
Level
-0.25
%
* w.r.t.: with respect to
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SS6781B
Note 1: Specifications are production tested at TA=25 . Specifications over the -40 to 85 operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). Note 2: Guaranteed by battery's specification. Note 3: Disable the temperature detective function is not recommended. Disable the temperature detection function may cause the detection error in some conditions. (For example, battery over discharge) Note 4: Generally the electrical current for charge or discharge is expressed in terms of a multiplier of C. For example, if the capacity is 1800mAh, we have the following: 0.1C=0.1*1800=180mA
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SS6781B
TYPICAL PERFORMANCE CHARACTERISTICS
VCC=5V, refer to Test Circuit)
1.08 81.5 81.0 1.02
(TA=25C, R2=5.1K,
Supply Current (mA)
Safety Timer (min)
4.6 4.8 5.0 5.2 5.4
80.5 80.0 79.5 79.0 78.5
0.96
0.90
0.84 4.4
VCC (V)
78.0 4.4
4.6
4.8
VCC (V)
5.0
5.2
5.4
5.6
Fig. 2 Supply Current vs. Supply Voltage
4.4
Fig. 3 Safety Timer vs. Supply Voltage
1.05
Supply Current (mA)
Frequency (Hz)
4.2
1.00
0.95
4.0
0.90
3.8
0.85
3.6 4.4
4.6
4.8
5.0
5.2
5.4
5.6
0.80 0
20
VCC (V) Fig. 4 LED Flashing Frequency vs. Supply Voltage
82 81 5.0 4.8
Temperature (C)
40
60
80
Fig.5 Supply Current vs. Temperature
Safety Timer (min)
80 79 78 77 76 75
Frequency (Hz)
4.6 4.4 4.2 4.0 3.8 3.6
0
20
40
60
80
3.4 -20
0
Temperature (C) Fig. 6 Safety Timer vs. Temperature
Temperature (C)
20
40
60
80
Fig. 7 LED Flashing Frequency vs. Temperature
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SS6781B
TYPICAL PERFORMANCE CHARACTERISTICS
2.80 2.28
(Continued)
2.76 2.16
VBT (V)
VBT (V)
0 20 40 60 80
2.72
2.68
2.04
2.64 1.92 2.60
0
20
40
60
80
Fig. 8
Temperature (C) VBT (High) Limit vs. Temperature (SEL3>3V)
Fig. 9
Temperature (C) VBT (High) Limit vs. Temperature (SEL3<2V)
0.20
33
0.18
Output Impedance ()
0 20 40 60 80
30
VBT (V)
0.16
27
0.14
24
0.12
21
Fig.10
Temperature (C) VBT (Low) Limit vs. Temperature (During Initial Timer)
Temperature (C) Fig.11 Output Impedance vs. Temperature (LED1, LED2, ICON Pins)
1.55
0
20
40
60
80
4.0
3.8
1.50
VTS (V)
3.6
VTS (V)
0 20 40 60 80
1.45
3.4
1.40
3.2
1.35
0
20
40
60
80
Fig.12
Temperature (C) VTS (Low Temp) Limit vs. Temperature
Temperature (C) Fig.13 VTS (High Temp) Limit vs. Temperature
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SS6781B
1.5
0.84
0.80
1.4
VBT (V)
VBT (V)
0 20 40 60 80
0.76
1.3
0.72
1.2
0.68
1.1
0.64 1.0 0 20 40 60 80
Temperature (C) Fig. 14 VBT (Low) Limit vs. Temperature (SEL3>3V, After Initial Timer)
Fig.15
Temperature (C) VBT (Low) Limit vs. Temperature (SEL3<2V, After Initial Timer)
BLOCK DIAGRAM
PEAK MODE GND VCC TMR
Peak Voltage Timer Control
MODE Selection
Bandgap Reference & Voltage Regulator
LED2
Oscillator
SEL3
Battery Voltage & Temperature Portection Setting
Charge Control
SEL1 SEL2 ADJ
LED`s Display & Trickle Pulse Duty Setting T/t Detection Setting Battery Temp. Protection 13-bit A/D Battery Voltage Protection
Display Control Unit
LED1
State Machine
ICON
Charge Control Unit
DIS
Discharge Control Unit
DSW
VTS
VBT
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SS6781B
PIN DESCRIPTIONS
PIN 1: PEAK- Tri-level input, determining the period of peak voltage timer. (See 0V cut-off section in application informations.) PIN 2: VBTPIN 3: DISDivided battery voltage input to sense the battery voltage. Push-pull output, used to control an external transistor to discharge the battery. DIS is active high when the SS6781B enters discharge mode. The battery cell temperature is represented as a voltage input to the SS6781B at this pin. The acceptable voltage range of VTS pin is 0.29VCC to 0.72VCC. The battery temperature is regarded as too high if the voltage of VTS pin is lower than 0.29VCC, and is otherwise regarded as too low if the voltage of VTS pin is higher than 0.72VCC. Power supply input at 5V10%. For adjusting the slope of T/t. Acceptable voltage range for this pin is approximately 0.28V to 3.8V. If voltage higher than VCC-0.3V, the function of T/t detection is disabled. the acceptable Determine voltage range of VBT pin and mode of temperature protection function.
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PIN 8: TMR-
Determine the period of safety timer with an external resistor connected to GND. the mode of PIN 9: MODE- Determine operation for the SS6781B.
PIN 10: SEL2 - Tri-level inputs, that jointly control the LED display mode and the duty of trickle charge after the completion of fast charge. PIN 11: SEL1- The same as Pin 10. PIN 12: GNDPower ground.
PIN 4: VTS-
PIN 13: LED1 & PIN 14: LED2- Open-drained outputs used to indicate the battery charging status. Two modes of display are available, depending on the setting of SEL1 and SEL2 pins. PIN 15: ICON- Open-drained output, used to control the charging current to the battery. PIN 16: DSW- Controlling the function of discharge- before- charge. (See discharge- before- charge subsection in application informations).
PIN 5: VCCPIN 6: ADJ-
PIN 7: SEL3-
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SS6781B
APPLICATION INFORMATIONS
THE SS6781B OPERATION Power-on and Battery Pre-qualifying When power is first applied to the SS6781B, all internal digital circuit blocks of the SS6781B are reset by the internal power-on-reset circuitry and output LEDs (depending on the setting of SEL1 and SEL2 pins) flash 3 times to indicate the initiation of power-on. The internal control unit then examines the battery condition through the VBT and VTS pins. The acceptable limits of VBT pin is determined by the input voltage of SEL3 pin and the acceptable temperature sense voltage window for VTS pin is 0.29 VCC to 0.72 VCC. If the voltage of VBT pin fails to fall within the predetermined acceptable limits, the SS6781B enters a charge-suspending mode, in which all the internal circuitry remains in reset state. If the voltage of VTS pin is outside the 0.29 VCC to 0.72 VCC window, action of SS6781B is determined by the input voltage of SEL3 pin. Discharge-Before-Charge The SS6781B provides the function of discharge-before-charge to precondition NiCd batteries which suffer from memory effect. This function can only be activated after the pre-qualification of battery voltage and temperature, yet before the charge completion is registered for the fast charge cycle. To trigger this function, DSW pin has to be biased to GND for over 0.18 second. After discharge begins, LED1 and LED2 pins are both off, ICON pin is on, and DIS pin goes high to activate an external circuit to discharge the battery until the voltage of VBT pin falls below 0.9V (or 0.69V, depending on the input voltage of SEL3 pin) or DSW pin is biased to GND for over 0.18 second again. Fast charge will automatically start after
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discharge is finished. The application circuit is included in TYPICAL APPLICATION CIRCUIT. Fast Charge After the battery passes fault checks and required discharging of the battery is completed, fast charging begins while initial timer and safety timer of the SS6781B start counting. Functions of -V detection, peak voltage timer, T/t detection, and maximum battery voltage are, however, disabled temporarily until the initial timer period in the initial stage of a charge cycle elapses. The initial timer period is equal to 1/80 of safety timer. Since the low limit of acceptable VBT voltage is only about 0.16V during the initial timer period, even deeply discharged batteries can easily qualify to be fast charged subsequently. In the course of fast charge, the SS6781B constantly monitors the voltages at VBT and VTS pins. The fast charge process is switched to trickle charge when any one of the following situations is encountered, which are explained below: Negative delta voltage (-V) Peak voltage timer (0 V ) Delta temperature/ delta time (T/t) Maximum charge time Maximum battery voltage Maximum battery temperature -V Cutoff The SS6781B makes a voltage sampling at VBT pin every 4 seconds when safety timer period is set equal to 80 minutes. If a negative delta voltage of 0.25% compared to its peak value is detected at VBT pin, the fast charge cycle is terminated. 0V Cutoff If the battery voltage stays at its peak value or decreases very slowly for the duration determined by the peak voltage timer, which is in turn
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SS6781B
determined by PEAK pin voltage, the fast charge action is terminated. T/t Cutoff The T/t detection of the SS6781B is performed by sensing the decrease of VTS pin voltage in a specific timer interval dictated by the safety timer. The fast charging terminates when the decrease of VTS pin voltage in 56 seconds exceeds the predetermined value set by ADJ pin input. This time interval of 56 seconds is based on the assumption that voltage of VTS pin is sampled once for every 8 seconds, which is also determined by safety timer. Functioning of -V detection and peak voltage timer (0 V ) can be disabled if the MODE pin is biased to GND. Functioning of T/t detection can be disabled if the voltage of ADJ pin is higher than VCC - 0.3V. Maximum Safety Timer Cutoff The maximum fast charge period is determined by the safety timer, which is set by a resistor connected from TMR pin to GND. Safety timer, -V sampling rate, and T/t sampling rate will be longer if the resistor value is larger. When the value of the resistor is 5.1K, the safety timer period equals 80 minutes. This can be verified by biasing MODE pin to VCC and the measured frequency on DSW pin should be around 32.8 KHz. After the safety timer period is finished, the fast charge action is terminated. Maximum Voltage and Temperature Cutoff The SS6781B guards against the maximum limits for battery voltage and temperature during fast charging. If either of these limits is exceeded, fast charge action is terminated. Trickle Charge There are five different selectable duty cycles for trickle charge after the fast charge to prevent the
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loss of charge due to battery self-discharging. The duty cycle is controlled by the setting of SEL1 and SEL2 pins. The functions and charging states control mentioned above are illustrated in the function flow chart of SS6781B (Fig. 16)
DESIGN GUIDE Selecting Peak Voltage Timer (0V) The voltage of PEAK pin along with safety timer determines the period of peak voltage timer. It can be selected according to the following table: TABLE 1 PEAK PIN VCC Floating GND PEAK VOLTAGE TIMER 1.5% of safety timer 3.7% of safety timer 6% of safety timer
Battery Voltage Measurement The SS6781B measures the battery voltage through VBT pin, which is connected to battery positive terminal through a resistor-divider network, as shown in Fig. 17. The input voltage of SEL3 pin determines the acceptable limit of divided battery voltage.
VBAT RA R5 + C5 100K 4.7F C6 0.1F AIC1781B 2 VBT
RB
Fig. 17 Battery Voltage Divider
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SS6781B
Power ON
LED Flash 3 Times
If VBT in Normal Range Yes
No
LED's Display Abnormal, ICON ON, Safety Timer Reset Yes If SEL3>VCC-0.3V or VCC/2-0.4V>SEL3 >1.4V
If VNTC<0.72 VCC No Yes
No
No
T/t Disabled
If VNTC>0.29VCC
No
If SEL3>VCC-0.3V or VCC/2-0.4V>SEL3 >1.4V
Yes
LED's Display, Abnormal, ICON ON, Safety Timer Reset
Yes No If Discharge Finished Yes If Discharge Enabled Battery Replacement No LED's Display Fast Charge, ICON OFF Safety Timer Counts No Yes
Yes
If Initial Timer Finished T/t Detector, -V Detector, Peak timer are all Disabled No Yes If Peak Timer Period has Finished No If 0.25% Decline of VBT is Detected No
Yes
Yes
LED's Display Battery Fulll, Fast Charge Finished, Trickle charge Starts
Battery Replacement
Yes
If T/ t has Reached
Yes No
No If Safety Timer Period has Finished
No
Yes
Fig. 16 Function Flow Chart of SS6781B
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SS6781B
For SEL3 > (VCC/2) + 0.4V, the suggested divider resistance of RA and RB for the corresponding number of battery cells are as below: TABLE 2 BATTERY CELLS 2~4 3~6 4~8 5~10 6~12 8~16 RA/RB 2 3.3 4.9 6.4 7.8 10.8 RA (K) 240 300 300 300 310 390 RB (K) 120 91 62 47 39
Battery Temperature Measurement The SS6781B employs a negative temperature coefficient (NTC) thermistor to measure the battery's temperature. The thermistor is inherently nonlinear with respect to temperature. To reduce the effect of nonlinearity, a resistor-divider network in parallel with the thermistor is recommended. A typical application circuit is shown in Fig. 18.
VCC VBAT Rx 4 Thermistor C7 0.1F 5 VCC VTS
36
AIC1781B
Ry 12 GND
For SEL3 < (VCC/2) -0.4V, the suggested divider resistance of RA and RB for the corresponding number of battery cells are as below: TABLE 3 BATTERY CELLS 2 3 4 5 6 8 10 12 16 RA/RB 1 2 3 4 5 7 9 11 15 RA(K) 240 240 240 300 300 360 360 390 410 RB (K) 240 120 80 75 60 51 40 36 27
Fig. 18 Battery Temperature Sense Circuit with a Negative Temperature Coefficient (NTC) Thermistor
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SS6781B
66 The calculation for Rx and Ry in the circuit is as following. Ry//RTH 0.29 VCC = x VCC Rx + (Ry// RTH) RTH= The resistance of thermistor at upper limit of temperature protection. Ry//R TL 0.72 VCC = x VCC Rx + (Ry// R TL ) RTL= The resistance of thermistor at lower limit of temperature protection. Substitution and rearranging the equations yield Rx= 2.061 x Ry =
RTL x RTH RTL - RTH 5. 3 x RTL x RTH RTL - 6. 3RTH
5.7 5.5 5.3 5.2 5.0
31.6 29.5 27.5 25.8 24.3
67 68 69 70
TABLE 5 Values of Rx and Ry at TL = -10C TH (C) 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Rx (K) 11.4 11.0 10.6 10.2 9.8 9.5 9.1 8.8 8.5 8.2 7.9 7.6 7.4 7.1 6.9 6.7 6.4 6.2 6.0 5.8 5.6 Ry (K) 95.6 85.0 76.2 68.9 62.8 57.5 52.9 48.8 45.3 42.1 39.4 36.8 34.6 32.5 30.7 29.0 27.4 26.0 24.6 23.4 22.2
If temperature characteristic of the thermistor is like that of SEMITEC 103AT-2, the resistance of Rx and Ry is tabulated for different TL and TH as below. (Note: TL is lower temperature limit and TH is upper temperature limit.) TABLE 4 Values of Rx and Ry at TL = 0C TH (C) 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65
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Rx(K) 10.1 9.7 9.4 9.0 8.7 8.4 8.1 7.8 7.5 7.2 7.0 6.8 6.5 6.3 6.1 5.9
Ry (K) 551.1 300.7 204.8 153.9 122.8 101.8 86.5 75.0 66.0 58.7 52.8 47.8 43.6 39.9 36.8 34.0
Setting the ADJ Pin Voltage The slope of T/t detection is determined by ADJ pin voltage of the SS6781B. The calculation of ADJ pin voltage is shown in the following procedure followed by an example.
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SS6781B
Procedure
(a) First, determine the temperature protection limits TH and TL. Then, substitute TH & TL into the following equation: V TS 0.72 V CC - 0. 29 V CC 0. 43 V CC = = TBASE TH - TL TH - TL (b) Determine the safety timer to obtain the value of tBASE . 56(sec.) tBASE(sec.) = x Safety Timer (min .) 80(min .) (c) Determine the expected slope of T / t at which temperature rises yC in x seconds and fast charge is subsequently cut off. T y = t x (d) Calculate the value of VADJ
120 min. (0.67C) 160 min. (0.5C) 200 min. (0.4C) 240 min. (0.33C)
1.35 1.80 2.25 2.70
1.80 2.40 3.01 3.61
2.25 3.01 3.76
A similar table for temperature range from 0C to 60C is as below. TABLE 7 ADJ Pin Voltage (TL=0C, TH=60C) T / t S.T. 40 min. (2C) 80 min. (1C) 120 min. (0.67C) 160 min. (0.5C) 200 min. (0.4C) 240 min. (0.33C) 0.75 1.0 1.25 (C/min.) (C/min.) (C/min.)
0.37 0.75 1.12 1.50 1.88 2.25
0.50 1.00 1.50 2.00 2.50 3.01
0.62 1.25 1.88 2.50 3.13 3.76
VADJ = 30 x
VTS T x x tBASE TBASE t
Example
VBT Range and Temperature Protection The acceptable voltage range of VBT pin and mode of temperature protection function is determined by the voltage of SEL3 pin, shown as the following: (a) SEL3 > VCC - 0.3V Acceptable VBT Range: Before initial timer: 0.16V~2.7V After initial timer: 0.69V~2.7V Temperature Protection Mode: Entering charge-suspending mode when temperature is either too low or too high, same as abnormal battery voltage. Latch for charge-suspending function is provided for high temperature protection, but not for low temperature protection.
(a) Let TH=50C, TL=0C, VCC =5V. We have VTS 0.43 x 5 = = 0.043V/ C TBASE 50 - 0 which means that VTS decreases 43mV as temperature rises 1C. (b) If safety timer is equal to 80 minutes, tBASE is then 56 seconds. (c) If fast charge should be terminated when temperature rises 1C in 60 seconds, then 1 T/t = = 0.0166 60 (d) VADJ =30 x 0.043x 0.0166 x 56 = 1.2(V) If the temperature range is from 0C to 50C, the voltage of VADJ under different setting conditions should be set as tabulated below. TABLE 6 ADJ pin Voltage (TL=0C, TH=50C) T / t S.T. 40 min. (2C) 80 min. (1C)
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(b) VCC - 1.4V> SEL3 >
V cc + 0.4V 2
0.75 1.0 1.25 (C/min.) (C/min.) (C/min.)
Acceptable VBT Range: Before initial timer: 0.16V~2.7V After initial timer: 0.69V~2.7V Temperature Protection Mode: If temperature is too high, battery charging is regarded as completed. If temperature is too
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0.45 0.90
0.60 1.20
0.75 1.50
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SS6781B
low, function of T/t detection is disabled, just as thermistor is not existing.
120
100
V cc (c) - 0.4V>SEL3 >1.4V 2
Acceptable VBT Range: Before initial timer: 0.16V~2V After initial timer: 1.2V~2V Temperature Protection Mode: Entering charge-suspending mode when temperature is either too low or too high, same as abnormal battery voltage. Latch for charge-suspending function is provided for high temperature protection, but not for low temperature protection. (d) 0.3V> SEL3 Acceptable VBT Range: Before initial timer: 0.16V~2V After initial timer: 1.2V~2V Temperature Protection Mode: If temperature is too high, battery charging is regarded as completed. If temperature is too low, function of T/t detection is disabled, just as thermistor is not existing. Setting the Period of Safety Timer The SS6781B provides a method for linearly adjusting the period of safety timer with an external resistor connected from TMR pin to GND. The relation between safety timer length and the external resistor (RTMR) is shown in Fig. 19. The table following shows the resistor values for some of the commonly chosen safety timer periods. Also shown in the table are their corresponding oscillator frequencies.
RTIM (Kohm)
80
60
40
20
0 0 200 400 600 800 1000 1200 1400
Safety Timer (min.)
Fig. 19 TABLE 8 RTMR (K)
Safety Timer vs. RTMR OSC. Freq.(KHz) Safety timer (min.)
0.9 2.2 3.5 5.1 7.8 10.9 17.5 26.2
2100 1049.6 704 518.4 353.6 264 174.4 116.8
20 40 60 80 120 160 240 360
Selecting Mode of Operation The SS6781B provides three modes of operation: normal, test, and AC mode determined by the setting of MODE pin according to TABLE 9. The AIC1781B will operate normally when the MODE pin is left floating (a 0.1F capacitor is recommended to be tied to MODE pin if the charge circuit works in a noisy environment). When the MODE pin is biased to GND, the function of -V detection is disabled. When the MODE pin is biased to VCC, the SS6781B enters the test mode. The test mode can be used to significantly reduce production test time. For relevant information please contact AIC directly.
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SS6781B
TABLE 9 MODE pin VCC Floating GND
The Operating Mode of SS6781B Mode Test Function Safety timer period scaled down to 1/512....etc. V detection disabled
TYPE 2
Power ON LED1 LED2 1Hz 1Hz Fault Charge Fast Charging Completed Conditions ON 4Hz Flashing OFF ON 4Hz Flashing OFF
Normal Normal operation AC
The Mode of LED Display and Trickle Charge The SS6781B provides two LED display modes and five-pulsed trickle charge modes. The tri-level inputs, SEL1 and SEL2 pins, as in the TABLE 6 determine the modes of LED display and trickle charge. TABLE 10 Mode of LED Display and Trickle Charge SEL1 SEL2 VCC Floating GND VCC Floating GND VCC Floating GND Trickle Charge LED Display Duty Mode N/A 1/32 1/64 1/128 1/256 N/A 1/32 1/64 1/128 Type 1 Type 1 Type 1 Type 1 Type 1 Type 2 Type 2 Type 2 Type 2
Charging Current Control As shown in the typical application circuit, the SS6781B offers an open-drained output pin, ICON pin, to control the charging current flow in fast charge state and switch on to inhibit the charging current flow in fault conditions. When fast charge is completed, the SS6781B enters the trickle charge mode. In trickle charge mode, the ICON pin output switches with predetermined duty cycle. Refer to the table of trickle charge mode (TABLE 6), the duty cycle is determined by the setting of SEL1 and SEL2 pins. The following table summarizes how ICON pin corresponds to various charging states.
Charge Power Fast Fault ON Charging Completed Conditions ICON ON OFF See pin 10 & 11 ON
VCC
Floating
GND
Display the Battery Charging Status The SS6781B provides two open-drained outputs, LED1 and LED2, to indicate the battery charging status. Refer to the table of LED display mode (TABLE 10), depending on the setting of SEL1 and SEL2 pins, the outputs of LED1 and LED2 pins are shown in the following table: TYPE 1
Fast Power Charge Fault ON Charging Completed Conditions LED1 LED2 1Hz OFF ON OFF OFF ON OFF OFF
Test Mode Fig. 20 shows the timing diagram for externally controlled PEAK, ADJ, VBT, VTS, SEL1 and SEL2 pin voltages of a recommended SS6781B test scheme, utilizing TEST mode function. Output waveforms of LED1, LED2 and ICON of a properly functioning SS6781B are also shown in the figure.
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SS6781B
TIMING DIAGRAM
Power ON
VCC, SEL3, MODE=5V, RTMR=2.9k, (DSW FREQ.=820KHz, 25 TIMES of 32.8K)
Init. PEAK TIMER TEST 5V -V TEST 0V -V DISABLE TEST T/t TEST SAFETY TIMER TEST
PEAK
ADJ 3V
5V
1.12V <2.1V
(-0.15%) 2V 1.95V 1.997V VBT 2V (-0.15%) 1.997V
2V
1.997V 1.9V
2V 2mV Step/100mS
1.5V 0V 2V
4V
1.993V (-0.35%) 4V 2V 1.97V (-2.15%) 1.85V (-2.5%)
4V 2V 2mV Step/100mS
4V 2V
VTS
OFF LED1 LED2 ON OFF
ON
OFF ON 3.2KHz
ON
OFF
ON
OFF
ON OFF OFF ON
ON
ICON SEL1 SEL2 TIME
(SEC.)
OFF
VCC Floating
0.1 0.14 0.12 1 2 0.28 0.2 3 0.12 4
Floating Floating
0.32 0.32 5 0.12 6 0.32
Floating GND 0.7
0.5 7
GND Floating
0.24 0.4 8
GND GND
2.14 9
Floating Floating
0.1 0.02 10
STAGE
0 0.14 0.26
0.54
0.74 0.86
1.18
1.5
1.62
1.94
2.64
3.14 3.38
3.78
5.92 6.02
6.04
Fig. 20
Timing Diagram of SS6781B in Test Mode
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SS6781B
PHYSICAL DIMENSIONS (unit: mm)
DIP-16
E D
S Y M B O L
DIP-16 MILLIMETERS MIN. MAX. 5.33 0.38 2.92 0.36 1.14 0.20 18.66 0.13 7.62 6.10 2.54 BSC 7.62 BSC 10.92 2.92 3.81 8.26 7.11 4.95 0.56 1.78 0.35 19.69
GAUGE PLANE
A
E1
0.38
A1 A2 b
eA eB
b2 c D D1
A2
A
E E1
WITH PLATING
e eA
A1
L
A
A
D1
BASE METAL
eB
b2
e
SECTION A-A
L
Note: 1. Refer to JEDEC MS-001BB. 2. Dimension D does not include mold flash, protrusions or gate burrs. Mold flash , protrusions or gate burrs shall not exceed 10 mil per side 3. Dimension "D1" and "E1" do not include inter-lead flash or protrusions. 4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
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SS6781B
SOP-16 (300 mil)
D
S Y M B O L
SOP-16(300mil) MILLIMETERS MIN. 2.35 0.10 0.33 0.23 10.10 7.40 1.27 BSC 10.00 0.25 0.40 0 10.65 0.50 1.27 8 MAX. 2.65 0.30 0.51 0.32 10.50 7.60
H
E
A A1 B C
h x 45
e
A
A
D
SEE VIEW B
E e
A
H h
A1
B C
L
WITH PLATING
0.25
BASE METAL SECTION A-A GAUGE PLANE SEATING PLANE
L
VIEW B
Note: 1. Refer to JEDEC MS-013AA. 2. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 6 mil per side. 3. Dimension "E" does not include inter-lead flash or protrusions. 4. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no guarantee or warranty, expressed or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of Silicon Standard Corporation or any third parties.
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