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SM8146AD1 EL Driver IC
OVERVIEW
The SM8146AD1 is a dedicated EL (Electro Luminescence) driver IC, capable of driving EL sheet up to 30cm2 in size. The EL drive circuit uses a technique that generates smooth sine wave EL drive waveforms without an output resistor, which has the advantage of preventing EL sheet audible noise, eliminating the need for additional peripheral components and a corresponding drop in power efficiency. Also, the EL drive voltage is constant-voltage controlled and is unaffected by supply voltage fluctuations, so that there are no EL brightness variations due to supply voltage changes. A dimming function is available under direct control from a microcontroller. The logic HIGH-level input voltage range (ENA, DIM pins) starts at 1.4V, allowing the device to be driven directly without external transistors from a Li-ion battery.
FEATURES
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APPLICATIONS
I I I I
I
I I I I
I I I I I I I
Sine wave EL drive waveforms for low audible noise Constant EL drive voltage independent of supply voltage fluctuations Separate coil and EL drive frequency adjustment Enable function (ENA pin) Dimming function (DIM pin) Direct control capability using 1.8V system CPU (ENA, DIM pins) VIH = 1.4V (min, VDD = 2.5 to 5.5V) 2.5 to 5.5V supply voltage range 170Vp-p (typ) maximum EL drive voltage 250Hz (typ) EL drive frequency (ROCE = 200k) 0.5mA (typ) operating current 1.0A (max) standby current 220H (typ) recommended inductance Package: 10-pin SON
Cellular phone Portable audio equipment Handy terminal Other portable application
STANDARD CIRCUIT CONFIGURATION
100k OCL 180k 1.4V < VIH < VDD OCE LDR VSS
Coil 220H Diode
1.0F OUT1
DIM
OFF ON OFF
CHV EL sheet OUT1 30cm2 OUT2 High voltage capacitor 0.0022F 100VDC
OUT2 OUT1 - OUT2
1.4V < VIH < VDD
ENA VDD
3.6V
EL drive voltage waveform
ORDERING INFORMATION
Device SM8146AD1 Package 10-pin SON SEIKO NPC CORPORATION --1
SM8146AD1
PINOUT
(Top view)
OCL OCE DIM ENA VDD
1
10
VSS LDR CHV OUT1
5
6
6
OUT2
PIN DESCRIPTION
Number 1 2 3 4 5 6 7 8 9 10 Name OCL OCE DIM ENA VDD OUT2 OUT1 CHV LDR VSS I/O I I Ip1 Ip1 - O O I O - Function Coil drive oscillator pin (frequency adjusted using an external resistor) EL drive oscillator pin (frequency adjusted using an external resistor) Dimming signal input pin (connect to ground when not used) Enable signal input pin (HIGH: enable, LOW: disable) Power supply pin EL drive output pin 2 EL drive output pin 1 High-voltage DC pin Coil drive output pin Ground pin
1. Pull-down resistor built-in
BLOCK DIAGRAM
EL sheet
LDR VDD
CHV
OUT1
OUT2
Output control circuits
High voltage switching circuit
1.4V < VIH < VDD
DIM
Dividing circuit
ENA
Dividing circuit
Oscillator for boosting voltage
VSS OCL
Oscillator for EL drive
OCE
SEIKO NPC CORPORATION --2
SM8146AD1
ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings
Parameter Supply voltage range Input voltage range CHV output voltage range LDR output voltage range OUT1/2 output voltage range Power dissipation Storage temperature range Symbol VDD VIN VCHV VLDR VOUT1/2 PD TSTG All input pins CHV pin LDR pin OUT1, OUT2 pins Ta 85C Conditions Rating -0.3 to 7.0 VSS - 0.3 to VDD + 0.3 0.5 to 120 0.5 to 120 0.5 to 120 100 -55 to 125 Unit V V V V V mW C
Recommended Operating Conditions
Rating Parameter Supply voltage range Operating temperature range Operating current1 Coil inductance Symbol VDD2 TOPR IDD2 LLDR Including coil current, VDD = 3.0V Including coil current, VDD = 5.0V fLDR = 64kHz 220 Conditions min 2.5 -40 typ 3.6 max 5.5 85 60 mA 36 H V C Unit
1. This value includes current tolerance and should not be exceeded.
SEIKO NPC CORPORATION --3
SM8146AD1
Electrical Characteristics
VDD = 3.6V, VSS = 0V, Ta = 25C unless otherwise noted
Rating Parameter Output voltage Output resistance Oscillator frequency OCE Frequency variable range Oscillator frequency OCL Frequency variable range Output frequency OUT1/2 Frequency variable range Coil drive frequency LDR Frequency variable range Input voltage Input current Rise time1 Signal input frequency2 ENA/DIM ENA/DIM ENA DIM Pin OUT1/2 LDR Symbol VOUT RLDR fOCE1 fOCE2 fOCL1 fOCL2 fOUT1 fOUT2 fLDR1 fLDR2 VIH VIL IIH tENA fDIM tDIMH Signal input time2 DIM tDIML Operating current Standby current VDD VDD IDD1 ISTB DIM input signal LOW-level pulsewidth minimum Excluding coil current ENA = LOW 3.0 0.5 0.01 1.0 1.0 s mA A Signal input frequency maximum value at 50% pulse duty DIM input signal HIGH-level pulsewidth minimum 3.0 ENA/DIM = HIGH, VDD = 2.5 to 5.5V ENA/DIM = LOW, VDD = 2.5 to 5.5V ENA/DIM = VDD = 3.6V 3.0 6.0 ROCL = 100k ROCE = 200k ROCL = 100k Conditions min VOUT maximum setting ILDR = 50mA ROCE = 200k 205 32 410 32 200 31 102 8 1.4 V 0.3 9.0 100 150 A ms kHz s 128 250 512 70 typ 85 8.0 256 max 100 12.0 307 kHz 1536 614 kHz 1536 300 Hz 1500 154 kHz 384 V Unit
1. tENA is the rating between the following levels.
ENA VSS
VDD - 0.5 VSS + 0.5
VDD
tENA
2. Design guarantee value
SEIKO NPC CORPORATION --4
SM8146AD1
OPERATIONAL DESCRIPTION
EL Sheet
I
EL Emission Condition
An AC (30Hz to several kHz) high voltage (60Vp-p to several hundred Vp-p) is required for EL emission. The SM8146AD1 supports an EL drive frequency range of 31Hz to 1500Hz and an EL drive voltage range of 86Vp-p to 170Vp-p.
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EL Life
The EL drive frequency and EL drive voltage have a simultaneous affect on the EL brightness and EL life span. The EL life decreases when the EL brightness is high, so an optimized value should be selected for the EL sheet used. The EL life also has an effect on the EL drive voltage waveform. The SM8146AD1 EL drive voltage waveform is a sine wave with small high-harmonic components which helps to extend EL life.
I
EL Audible Noise
The EL sheet has a piezoelectric characteristic that generates audible noise when excited by the applied AC high voltage. The SM8146AD1 EL drive voltage waveform is a sine wave with small high-harmonic components which helps to reduce EL audible noise. The EL drive waveform sine wave, generated by the EL drive circuit, does not require an output resistor. Consequently, peripheral components and a corresponding drop in power efficiency can be avoided.
I
EL Drive Voltage (Constant-Voltage Control and Overvoltage Protection)
The SM8146AD1 uses constant-voltage control where the EL drive voltage is set to 7 stabilized voltage amplitude levels determined by the IC internal circuitry. The EL drive voltage amplitude is initially set to the default value of 85V, and then changes in sync with the falling edge of each DIM input pulse in the continuous sequence 85V 78V 71V 64V 57V 50V 43V 0V (OFF) 85V. The EL drive voltage constant-voltage control not only eliminates EL brightness variations due to supply voltage fluctuations, but also functions as overvoltage protection when the EL load is removed.
Interface
The SM8146AD1 uses an interface comprised by the ENA and DIM input pins. The ENA and DIM pins have a HIGH-level input voltage range of 1.4V to VDD + 0.3V, enabling direct control from a 1.8V system microcontroller without the need for a voltage converter. Pull-down resistances are built-in.
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ENA Pin
The ENA pin functions as the IC ON/OFF control. The device is enabled when ENA is HIGH, and disabled when ENA is LOW.
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DIM Pin
The DIM pin functions as the EL brightness adjustment (dimming) control. The EL drive voltage amplitude reduces in sync with the falling edge of each DIM input pulse in the continuous sequence 85V 78V 71V 64V 57V 50V 43V 0V (OFF) 85V. The DIM pin should be connected to GND when EL brightness control is not used.
SEIKO NPC CORPORATION --5
SM8146AD1
EL Brightness Adjustment
The SM8146AD1 EL brightness can be adjusted using a combination of two methods: (1) EL drive voltage control and (2) EL drive frequency control.
(1) EL Brightness Adjustment using EL Drive Voltage
This dimming function changes the EL brightness in response to the EL drive voltage determined by the number of input pulses on the DIM pin. An internal counter is used to count the number of DIM input pulses and the OUT1/OUT2 EL drive voltage amplitude level changes in response, varying the EL brightness. The 3-bit internal counter provides 8-step adjustment (DATA 0 to 7). On the 7th pulse (DATA = 7), the EL sheet is turned OFF. On the 8th pulse (DATA = 0), the voltage is set to the default value (maximum brightness). Since the default value provides the maximum brightness, the DIM pin should be connected to GND when the dimming function is not used.
Table 1. OUT1/OUT2 pins voltage amplitude and DIM pin input pulse count
DATA 0 0 DIM pin input pulse count 8 16 OUT1/OUT2 pins voltage amplitude 85V 1 1 9 17 78V 2 2 10 18 71V 3 3 11 19 64V 4 4 12 20 57V 5 5 13 21 50V 6 6 14 22 43V 7 7 15 23 0V
DATA 0 DATA 7 DATA 1
DIM pin pulse input
DATA 6 Standby DATA 2
ENA pin = "High" ENA pin = "Low"
"Low" "High"
DATA 5 DATA 4
DATA 3
Transition diagram of IC internal state by ENA and DIM pins
20 18
Voltage amplitude
100 90 80 70 60 50 40 30
Brightness
16 Brightness [cd/m2] 14 12 10 8 6 4 2 0 0 1 2 3 4 5 6 7
20 10 0
DIM pin input pulse
DIM pin input pulse count vs. EL brightness, OUT1/OUT2 pins voltage amplitude
OUT1/OUT2 pins voltage amplitude [V]
SEIKO NPC CORPORATION --6
SM8146AD1
1 DIM 85V 78V
2
3
4
5
6
7
8
9
10
85V 71V 64V 57V
78V
71V
OUT1 pin Setting voltage amplitude 170Vp-p 156Vp-p 142Vp-p 128Vp-p 114Vp-p
50V
43V
VSS
86Vp-p 100Vp-p 0V
OUT2 pin Setting voltage amplitude 71V 64V 57V
50V
43V 71V
78V 85V
85V
78V
Note: Target values without compensation for voltage accuracy.
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Input pulse to DIM pin
The pulse input to DIM pin is allowed after startup time 1msec that is for initializing IC interior with ENA pin at High level. The output voltage is setup at the initial value DATA0: 85V. The pulse input to DIM pin changes the output pin voltage setting, so that the EL brightness can be adjusted.
VDD pin
ENA pin
VDD - 0.5 VSS + 0.5 Dimming enable tENA < 100msec Startup time < 1msec
DIM pin tDIMH > 3sec Internal status tDIML > 3sec DATA0: 85V DATA1: 78V DATA2: 71V DATA3: 64V DATA4: 57V DATA5: 50V DATA6: 43V DATA7: 0V
SEIKO NPC CORPORATION --7
SM8146AD1
I
Method to increase EL brightness in steps (Fade-in)
The raise of output voltage in steps by the input pulse to DIM pin increases the EL brightness in steps. The timing chart is shown below. Initially the ENA pin is turned to High level, and then the pulse should be input after startup time 1msec of IC interior. Since the output voltage is setup at the initial value DATA0: 85V, when the seven times in a row of pulse are input to DIM pin, the setup value of output voltage becomes DATA7: 0V which is the first tone of fade-in. When the seven times in a row of pulse are input to DIM pin once again after the time tFD, the setup value of output voltage becomes DATA7: 43V which is the second tone of fade-in. If this operation is repeated six times, the brightness becomes maximum value, thus the fade-in would be realized. The frequency of the pulse which is input to DIM pin should be set up at over several tens of kHz. This frequency is adequately higher than the EL driving frequency in order that the EL brightness does not vary during the continuous pulse input.
Startup time < 1msec Dimming enable ENA pin
DIM data count DIM pin Internal status DATA0: 85V DATA1: 78V DATA2: 71V DATA3: 64V DATA4: 57V DATA5: 50V DATA6: 43V DATA7: 0V
7 pulse DATA: 1-7
7 pulse DATA: 0-6
7 pulse 7 pulse 7 pulse DATA: 7-5 DATA: 6-4 DATA: 5-3
7 pulse DATA: 4-2
7 pulse DATA: 3-1
7 pulse DATA: 2-0
tFD DIM data count DIM pin Internal status DATA0: 85V DATA1: 78V DATA2: 71V DATA3: 64V DATA4: 57V DATA5: 50V DATA6: 43V DATA7: 0V tDIMH > 3sec tDIML > 3sec
DATA:7 DATA:0 DATA:1 DATA:2 DATA:3 DATA:4 DATA:5
Recommended setting value: tFD = 90msec tDIMH = 25sec tDIML = 25sec
SEIKO NPC CORPORATION --8
SM8146AD1
(2) EL Brightness Adjustment using EL Drive Frequency
This dimming function changes the EL brightness in response to the EL drive frequency determined by the value of the resistance of ROCE connected to the OCE pin. This dimming property should only be set when determining the peripheral components. It is not recommended to vary the EL brightness by switching the ROCE resistance.
EL Output Voltage Waveform (Sine Wave) Distortion
OUT1
OUT2
OUT1 - OUT2
Flat regions near the waveform peaks of EL driving voltage are generated in principle of operation. They are not failure and do not affect the brightness and the audible noise.
OUT1
OUT2
VOUT1 - VOUT2
OUT1 - OUT2
Depending on conditions, the OUT1/OUT2 output waveform may become distorted as shown by the solid line in the figure above. If the booster circuit drive capability is insufficient, the circuit may not be able to provide the boost required to meet the ideal curve shown by the dotted line in the figure above. This condition can be caused by the inductor supply voltage being too low, the inductance value being too high, the inductor frequency being too high, the EL drive frequency being too high, or the EL surface area being too large.
SEIKO NPC CORPORATION --9
SM8146AD1
TYPICAL APPLICATION CIRCUIT
EL Sheet: 10cm2
Direct power supply from Li-ion secondary battery
ROCL ROCE
VIH > 1.4V
OCL OCE DIM
VSS LDR
L D
C1 1.0F
CHV OUT1 OUT2 EL sheet 10cm2 C2
OFF
ON
OFF
ENA VDD
VIH > 1.4V
Li-ion battery 3.2 to 4.2V
D : TOSHIBA L : TAIYO YUDEN C2 : MURATA
1SS403 NR4012T221M GRM3192C2A222JA01
VDD [V]
IDD [mA]
L [H]
ROCL [k]
ROCE [k] 150
fOUT [Hz] 345 420 500
VOUT [V]
Brightness [cd/m2]
Other component -
3.2 to 4.2
Figure 1
220
220
120 100
Figure 2
Figure 3
- -
30.0 25.0 20.0 15.0
ROCE = 120k ROCE = 150k
200 180
Brightness [cd/m2 ]
ROCE = 150k
35.0
ROCE = 100k
30.0 25.0 20.0 15.0 10.0 5.0
ROCE = 120k ROCE = 150k
VOUT [Vp-p]
ROCE = 100k
IDD [mA]
160
ROCE = 120k
140
ROCE = 100k
10.0 5.0 3.20 3.40 3.60 3.80 4.00 4.20 VDD [V]
120 100 3.20 3.40 3.60 3.80 4.00 4.20 VDD [V]
3.20
3.40
3.60
3.80
4.00
4.20
VDD [V]
Figure 1. VDD VS. IDD
Figure 2. VDD VS. VOUT
Figure 3. VDD VS. Brightness
SEIKO NPC CORPORATION --10
SM8146AD1 Power supply from stabilizing supply
ROCL ROCE
VIH > 1.4V
OCL OCE DIM
VSS LDR
L D
C1 1.0F
CHV OUT1 OUT2 EL sheet 10cm2 C2
OFF
ON
OFF
ENA VDD
VIH > 1.4V
Ragulated voltage
D : TOSHIBA 1SS403 L : TAIYO YUDEN NR4012T221M C2 : Refer to the table below
VDD [V] 3.0 3.3 4.0 5.0
IDD [mA] 17.4 20.6
L [H]
ROCL [k] 390 330
ROCE [k] 200 130 91 91
fOUT [Hz] 262 392 538 541
VOUT [V] 165 165 165 165
Brightness [cd/m2] 19.5 26.1 31.5 32.2
Other component C2: GRM3192C2A222JA01 C2: GRM3192C2A222JA01 C2: GRM3192C2A222JA01 C2: GRM3192C2A472JA01
220 20.0 15.5 220 110
SEIKO NPC CORPORATION --11
SM8146AD1
EL Sheet: 20cm2
Direct power supply from Li-ion secondary battery
ROCL ROCE
VIH > 1.4V
OCL OCE DIM
VSS LDR
L D
C1 1.0F
CHV OUT1 OUT2 EL sheet 20cm2
OFF
ON
OFF
ENA VDD
VIH > 1.4V
C2
Li-ion battery 3.2 to 4.2V
D : TOSHIBA L : TAIYO YUDEN C2 : MURATA
1SS403 NR4012T221M GRM3192C2A222JA01
VDD [V]
IDD [mA]
L [H]
ROCL [k]
ROCE [k] 270
fOUT [Hz] 198 241 288
VOUT [V]
Brightness [cd/m2]
Other component -
3.2 to 4.2
Figure 1
220
220
220 180
Figure 2
Figure 3
- -
30.0 25.0
ROCE = 220k ROCE = 180k
200 180
VOUT [Vp-p]
30.0 25.0 Brightness [cd/m2 ]
ROCE = 180k
ROCE = 270k
IDD [mA]
20.0 15.0
ROCE = 270k
160
ROCE = 220k
20.0 15.0
ROCE = 270k
ROCE = 220k
140
ROCE = 180k
10.0 5.0 3.20 3.40 3.60 3.80 4.00 4.20 VDD [V]
120 100 3.20 3.40 3.60 3.80 4.00 4.20 VDD [V]
10.0 5.0 3.20 3.40 3.60 3.80 4.00 4.20 VDD [V]
Figure 1. VDD VS. IDD
Figure 2. VDD VS. VOUT
Figure 3. VDD VS. Brightness
SEIKO NPC CORPORATION --12
SM8146AD1 Power supply from stabilizing supply
ROCL
OCL OCE DIM
VSS LDR
L D
ROCE
VIH > 1.4V
C1 1.0F
CHV OUT1 OUT2 EL sheet 20cm2
OFF
ON
OFF
ENA VDD
VIH > 1.4V
C2
Ragulated voltage
D : TOSHIBA 1SS403 L : TAIYO YUDEN NR4012T221M C2 : Refer to the table below
VDD [V] 3.0 3.3 4.0 5.0
IDD [mA] 21.0 20.9
L [H]
ROCL [k] 390 330
ROCE [k] 300 240 180 120
fOUT [Hz] 177 221 291 423
VOUT [V] 165 165 165 165
Brightness [cd/m2] 15.4 18.3 22.0 28.2
Other component C2: GRM3192C2A222JA01 C2: GRM3192C2A222JA01 C2: GRM3192C2A222JA01 C2: GRM3192C2A472JA01
220 19.2 20.2 220 160
SEIKO NPC CORPORATION --13
SM8146AD1
EL Sheet: 30cm2
Direct power supply from Li-ion secondary battery
ROCL ROCE
VIH > 1.4V
OCL OCE DIM
VSS LDR
L D
C1 1.0F
CHV OUT1 OUT2 EL sheet 30cm2
OFF
ON
OFF
ENA VDD
VIH > 1.4V
C2
Li-ion battery 3.2 to 4.2V
D : TOSHIBA L : TAIYO YUDEN C2 : MURATA
1SS403 NR4012T221M GRM3192C2A332JA01
VDD [V]
IDD [mA]
L [H]
ROCL [k]
ROCE [k] 430
fOUT [Hz] 125 162 182
VOUT [V]
Brightness [cd/m2]
Other component -
3.2 to 4.2
Figure 1
220
220
330 300
Figure 2
Figure 3
- -
30.0 25.0
ROCE = 300k
200 180 160 140 120 100
3.40 3.60 3.80 4.00 4.20
ROCE = 330k
30.0 25.0 Brightness [cd/m2 ]
ROCE = 430k
IDD [mA]
20.0 15.0 10.0 5.0 3.20 VDD [V]
ROCE = 330k ROCE = 430k
VOUT [Vp-p]
20.0
ROCE = 300k
ROCE = 330k
15.0 10.0 5.0
ROCE = 300k
ROCE = 430k
3.20
3.40
3.60
3.80
4.00
4.20
3.20
3.40
3.60
3.80
4.00
4.20
VDD [V]
VDD [V]
Figure 1. VDD VS. IDD
Figure 2. VDD VS. VOUT
Figure 3. VDD VS. Brightness
SEIKO NPC CORPORATION --14
SM8146AD1 Power supply from stabilizing supply
ROCL ROCE
VIH > 1.4V
OCL OCE DIM
VSS LDR
L D
C1 1.0F
CHV OUT1 OUT2 EL sheet 30cm2
OFF
ON
OFF
ENA VDD
VIH > 1.4V
C2
Ragulated voltage
D : TOSHIBA 1SS403 L : TAIYO YUDEN NR4012T221M C2 : Refer to the table below
VDD [V] 3.0 3.3 4.0 5.0
IDD [mA] 18.4 20.5
L [H]
ROCL [k] 390 330
ROCE [k] 560 390 270 180
fOUT [Hz] 97 138 199 291
VOUT [V] 165 165 165 165
Brightness [cd/m2] 9.8 12.6 16.5 21.5
Other component C2: GRM3192C2A222JA01 C2: GRM3192C2A222JA01 C2: GRM3192C2A472JA01 C2: GRM3192C2A472JA01
220 20.8 20.8 220 160
SEIKO NPC CORPORATION --15
SM8146AD1
PERIPHERAL COMPONENT SELECTION
Coil
Booster coil. Where possible, a closed-magnetic circuit type coil should be selected. If the coil inductance is less than 100H, the switching cannot keep pace and the brightness cannot be increased. The coil flowing into the coil is a sawtooth waveform, and care should be taken to ensure the peak current does not exceed the maximum current rating. The coil DC resistive component causes power loss, so a coil with low DC resistive component is advantageous. The recommended inductance is 100 to 470H.
Table 2. Recommended parts list (Attention: ROCL and ROCE should be optimized per inductor.)
Manufacture TAIYO YUDEN Part number NR4012T221M NR3010T101M LQH3NPN221NG0 MURATA LQH3NPN151NG0 LQH3NPN101NG0 LQH32CN221 TDK VLS3012T-101MR23 1156AS-221M TOKO 1156AS-151M 1156AS-101M 888FU-221M Inductance [H] 220 100 220 150 100 220 100 220 150 100 220 Dimensions [mm] W 4.0 3.0 3.0 3.0 3.0 3.2 3.0 2.85 2.85 2.85 3.5 L 4.0 3.0 3.0 3.0 3.0 2.5 3.0 2.8 2.8 2.8 3.5 T 1.2 1.0 1.0 1.0 1.0 2.0 1.2 1.0 1.0 1.0 1.7
Diode
Rectifier diode. This diode rectifies the high voltage generated by the coil. The peak reverse voltage exceeds 100V, hence a fast recovery type diode is recommended.
Table 3. Recommended parts list
Manufacture TOSHIBA ROHM 1SS403 RF051VA2S RF071M2S Part number Dimensions [mm] W 1.7 1.9 2.6 L 1.25 1.3 1.6 T 0.9 0.6 0.8
High-voltage capacitor
Smoothing capacitor. This capacitor smooths the high voltage generated by the coil and rectified by the diode. A withstand voltage rating of 100V should be selected. Generally, a high-dielectric ceramic capacitor will generate audible noises. The capacitors below are recommended. The recommended value is 0.0022 to 0.0033F (100V).
Table 4. Recommended parts list
Manufacture MURATA TDK Panasonic Part number GRM3192C2A222JA01 C2012CH2A222 ECWU1222JX5 Capacitance [F] 0.0022 0.0022 0.0022 Dimensions [mm] W 3.2 2.0 3.2 L 1.6 1.25 1.6 T 0.85 0.85 1.1
ELECTROSTATIC BREAKDOWN PROTECTIVE MEASURES (ESD)
Electrostatic breakdown protective measures are required because the keypad comes into direct contact with the human body. The EL sheet surface is coated with an insulating film, but if the electrodes on the EL sheet periphery are exposed, static electricity can flow from these electrodes into the IC and lead to electrostatic breakdown. Accordingly, the EL sheet should be designed so that the electrodes are not exposed, or otherwise covered using insulating tape to provide a similar level of protection.
SEIKO NPC CORPORATION --16
SM8146AD1
EVALUATION BOARD PATTERN
Pattern (Top view)
Silk + Resist (Top view)
Pattern (Bottom view)
SEIKO NPC CORPORATION --17
SM8146AD1
PACKAGE DIMENSIONS
(Unit: mm)
TOP VIEW
10 6
2.85 0.05 1.8 0.05
BOTTOM VIEW
6
2.4 0.05
10
0.3 0.05
1
3.1 0.05
5
5 0.65 0.4MAX
.05 1 0.3 0.05
C0
0.05 M
0.05
FOOTPRINT
0.50 0.35 0.35
0.40
0.90 0.65 1.60 2.35 3.15
3.30
1.15
0.65
1.60 2.25 3.25
Foot pattern
Metal mask pattern
SEIKO NPC CORPORATION --18
1.15
3.30
SM8146AD1
Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter "Products") are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from SEIKO NPC CORPORATION (hereinafter "NPC"). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies.
SEIKO NPC CORPORATION
15-6, Nihombashi-kabutocho, Chuo-ku, Tokyo 103-0026, Japan Telephone: +81-3-6667-6601 Facsimile: +81-3-6667-6611 http://www.npc.co.jp/ Email: sales@npc.co.jp
NC0616BE 2007.09
SEIKO NPC CORPORATION --19

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