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VISHAY
TOIM4232
Vishay Semiconductors
SIR Endec for IrDA Applications Integrated Interface Circuit
ULC Technology: High performance gate array package using multiple metal layer CMOS technology featuring sub-micron channel lengths (0.35 m).
Description
The TOIM4232 Endec IC provides proper pulse shaping for the SIR IrDA(R) front end infrared transceivers as of the 4000-series. For transmitting the TOIM4232 shortens the RS232 output signal to IrDA compatible electrical pulses to drive the infrared transmitter. In the receive mode, the TOIM4232 stretches the received infrared pulses to the proper bit width depending on the operating bit rate. The IrDA bit rate varies from 2.4 kbit/s to 115.2 kbit/s. The TOIM4232 is using a crystal clock 3.6864 MHz for its pulse stretching and shortening. The clock can be generated by the internal oscillator. An external clock can be used, too. The TOIM4232 is programmable to operate from 1200 bit/s to 115.2 kbit/s by the communication software through the RS232 port. The output pulses are software programmable as either 1.627 s or 3/16 of bit time. The typical power consumption is very low with about 10 mW in operational state and in the order of a few microwatts in standby mode.
18080
Features
* Pulse shaping function (shortening and stretching) used in SIR IrDA(R) applications * Directly interfaces the SIR transceiver TFD..series to an RS232 port * Programmable baud clock generator (1200 Hz to 115.2 kHz), 13 baud rates * 3/16 bit pulse duration or 1.627 s pulse selectable * SO16 - package * 2.7 V to 3.6 V operation voltage, 5 V tolerant inputs * Low operating current
Block Diagram
Vcc TD_232 RD_232 Endec RD_IR TD_IR
BR/D
Baud Generator Logic
TD_LED RD_LED S1 S2 Vcc_SD
RESET
Osci llator
GND X1 X2
18079
Document Number 82546 Rev. 1.4, 01-Dec-03
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TOIM4232
Vishay Semiconductors
VISHAY
Pin Assignment and Description
Pin Number 1 Symbol RESET Description Resets all internal registers. Initially must be HIGH ("1") to reset internal registers. When HIGH, the TOIM4232 sets the IrDA default bit rate of 9600 bit/s, sets pulse width to 1.627 s. The VCC_SD output is simply an inverted reset signal which allows to shut down of a TFDx4x00 transceiver when applying the reset signal to the TOIM4232. When using devices with external SD like TFDS4203, the reset line can be used directly as shut down signal. RESET pin can be controlled by either the RTS or DTR line through RS232 level converter. Minimum hold time for resetting is 1 s. Disables the oscillator when active. Baud Rate control/ Data. BR/ D = 0, data communication mode: RS232 TXD data line is connected (via a level shifter) to TD_232 input pin. The TXD - signal is appropriately shortened and applied to the output TD_IR, driving the TXD input of the IR transceiver. The RXD line of the transceiver is connected to the RD_IR input. This signal is stretched to the correct bit length according the programmed bit rate and is routed to the RS232 RXD line at the RD_232 pin. BR/ D = 1, Programming mode: Data received from the RS232 port is interpreted as Control Word. The Control Word programs the baud rate width will be effective as soon as BR/ D return to LOW. Received signal data output of stretched signal to the RS232 RXD line (using level converter). Input of the signal to be transmitted from the RS232 port TXD line (passing the level converter). Outputs an inverted RESET signal. Can be used to shut down the power supply of a 4000 series transceiver (e.g., TFDU4100). VCC shutdown output function. This pin can be used to shut down a transceiver (e.g., TFDx4xxx). Output polarity: Inverted RESET input. Crystal input clock, 3.6864 MHz nominal. Input for external clock *) Crystal *) Ground in common with the RS232 port and IrDA transceiver ground Transmit LED indicator driver. Use 180 current limiting resistor in.series to LED to connect to VCC. (VCC = 3.3 V) Receive LED indicator driver. Use 180 current limiting resistor in series to LED to connect to VCC. (VCC = 3.3 V) No connection User Programmable Bit. Can be used to turn ON/ OFF a front-end infrared transceiver (e.g., an infrared module at the adapter front) User Programmable Bit. Can be used to turn ON/ OFF a front-end infrared transceiver (e.g., an infrared module at the adapter back) Data output of shortened signal to the infrared transceiver Data input from the infrared transceiver, min. pulse duration 1.63 s **) Supply voltage O O O I I LOW LOW HIGH LOW O O LOW LOW O I O HIGH HIGH LOW I/O Active HIGH
2
BR/ D
3 4 5
RD_232 TD_232 VCC_SD
6 7 8 9 10 11 12 13 14 15 16
X1 X2 GND TD_LED RD_LED NC S1 S2 TD_IR RD_IR VCC
I I
*) Crystal should be connected as shown in figure 2. In addition connect a 100 k resistor from Pin 6 to Pin 7 and from Pin 6 and Pin 7 a 22 pF capacitor to ground, respectively. When an external clock is available connect it to Pin 6 leaving Pin 7 open. The external resistor of 100 k is used to accelerate the start of oscillation after reset or power - on. The value depends on the "Q" of the resonator. With low Q resonators it is not necessary. The start - up time of the oscillator is between 30 s (with piezo resonators) and above 2 ms with high Q quartzes. **) All Vishay Semiconductor SIR transceivers fulfill this condition
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Document Number 82546 Rev. 1.4, 01-Dec-03
VISHAY
Block diagram of application circuit
TOIM4232
Vishay Semiconductors
Operating the interface circuit at a PC COM - port. When operating directly with an UART with 3 V - or 5 V - logic, in the application circuit no level converter is necessary.
DTR RTS TxD RxD
RS232 9 pin connector Level converter
RESET VCC_SD BR/D TD_232 RD_232
X1
VCC TxD RxD
TD_IR RD_IR
TOIM4232
R1 X2 100 k TFDU4100 TFDS420x TFDU4300
3.6864 MHz C1 18081 2 x 22 pF C2
Table 1. Recommended Application Circuit Components
Component C1 C2 R1 Quartz Crystal Recommended Value 22 pF 22 pF 100 k 3.686400 MHz Vishay Part Number VJ 1206 A 220 J XAMT VJ 1206 A 220 J XAMT CRCW-1206-1003-F-RT1 XT49S - 20 - 3.686400M
Absolute Maximum Ratings
Parameter Supply voltage Input voltage Output voltage Output sinking current, max Junction temperature, max Ambient temperature (operating) Storage temperature Soldering temperature t = 20 s @ 215 C all pins all pins all pins IO TJ Tamb Tstg Tsldr - 25 - 25 215 Test Conditions Symbol VCC Min - 0.5 - 0.5 - 0.5 Typ. Max 3.6 5.5 VCC + 0.5 8 125 85 85 230 Unit V V V mA C C C C
DC Characteristics
Parameter Operating voltage VCC = 3.3 V 5 %, operating temperature = - 55 C to + 125 C Parameter Input HIGH voltage Test Conditions inputs tolerate levels as high as 5.5 V max. all inputs are Schmitt trigger inputs Symbol VIH Min Typ. 1.7 Max 2.0 Unit V Test Conditions Symbol VCC Min 2.7 Typ. 3.3 Max 3.6 Unit V
Input LOW voltage Input Schmitt trigger hysteresis
VIL Vhyst
0.8
1.1 0.6
V V
Document Number 82546 Rev. 1.4, 01-Dec-03
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TOIM4232
Vishay Semiconductors
Parameter Input leakage no pull-up/down Output HIGH voltage Output LOW voltage Consumption current standby Consumption current dynamic Test Conditions VIN = VDD or GND IOH = - 2.0 mA IOH = - 0.5 mA IOL = + 2.0 mA inputs grounded, no output load VCC = 3.3 V, T = 25 C inputs grounded, no output load VCC = 3.3 V, T = 25 C Symbol IL VOH VOH VOL ISB ICC 2 Min - 10 2.0 2.4 0.4 1 Typ. 1 Max 10
VISHAY
Unit A V V V A mA
Operation Description
Figure 2 shows a typical example of an RS232 port interface. The TOIM4232 connects to an RS232 level converter on one side, and an infrared transceiver on the other. The internal TOIM4232 baud rate generator can be software controlled. When BR/D = 0, the TOIM4232 interprets the channels TD_232 to TD_IR and RD_IR to RD_232 as data channels. On the other hand, whenever BR/D = 1, the TOIM4232 interprets TD_232 as Control Word for setting the Baud rate. The Baud rate can be programmed to operate from 1200 bit/s to 115.2 kbit/s. As RS232 level converter, EIA232 or MAX232 or equivalent are recommended. When using the TOIM4232 directly connected to an UART it is compatible to 5 V TTL and 3.3 V CMOS logic. Typical external resistors and capacitors are needed as shown in the TFDx4xxx references. The output pulse duration can also be programmed, see chapter "Operation Description". It is strongly recommended using 1.627 s output pulses to save bat-
tery power. As frequency determining component a Vishay XT49M Crystal is recommended, when no external clock is available. We strongly recommend not to use this 3/16 mode because 3/16 pulse length at lower bit rates consumes more power than the shorter pulse. At a data rate of 9600 bit/s, the ratio of power consumption of both modes is a factor of 12 (!).
Programming the TOIM4232
For correct, data rate dependent timing the TOIM4232 is using a built-in baud rate generator. This is used when no external clock is not available as in RS232 IR-dongle applications. For programming the BR/D pin has to be set active, BR/D = 1. In this case the TOIM4232 interprets the 7 LSBs at the TD_232 input as a Control Word. The operating baud rate will change to its supposedly new baud rate when the BR/D returns back to LOW ("0") Set the UART to 8 bit, no parity, 1 stop bit.
Control Byte (8 bit)
First Character X S2 S1 S0 B3 Second Character B2 B1 B0 LSB
X: Do not care S1, S2: User programmble bit to program the outputs S1 and S2 S0: Irda pulse select S0 = (1): 1.627 s pulses S0 = (0): 3/16 bit time pulses, not recommended B0 .. B3: Baud rate select words
Example: To set TOIM4232 at COM2 port (2F8) to 9600 bit/s with 3/16 bit time pulse duration send to the TOIM4232 in programming mode in e.g. "Basic" OUT &H2F8, (&H6) For same port, 9600 bit/s and 1.627 s pulse duration send OUT &H2F8, (&H16) For additionally activating S1 send OUT &H2F8, (&H36)
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Document Number 82546 Rev. 1.4, 01-Dec-03
VISHAY
Baud Rate Select Words
B3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 B2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 B1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 B0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2nd Char 0 1 2 3 4 5 6 7 8 9 A B C D E F Baud Rate 115.2 k 57.6 k 38.4 k 19.2 k 14.4 k 12.8 k 9.6 k 7.2 k 4.8 k 3.6 k 2.4 k 1.8 k 1.2 k forbidden forbidden forbidden
TOIM4232
Vishay Semiconductors
Note: IrDA standard only supports 2.4, 9.6, 19.2, 57.6, and 115.2 kbit/s.
Software for the TOIM4232 UART Programming
For proper operation, the RS232 must be programmed (using 8bit, 1stop, no parity) to send a two character control word, YZ. The control word YZ is composed of two characters, written in hexadecimal, in format: YZ. The transfer rate for programming must be identical with the formerly programmed data rate, or after resetting the TOIM4232, the default rate of 9600 bit/s is used. Step. 1 2 RESET High Low BR/ D X X TD_UART X X RD_UART X X RD_IR X X TD_IR X X Description and Comments Resets all internal registers. Resets to IrDA default data rate of 9600 bit/s Wait at least 2 ms, to allow start-up of internal clock. When external clock is used: Wait at least 7 s. Wait at least 7 s. TOIM4232 now is set to the Control Word programming mode Sending the Control Word YZ.
Examples: Send "1Z" if 1.627 s pulses are intended to be used. Otherwise send "0Z" for 3/16 bit period pulses. "Y6" keeps the 9.6 kbit/s data rate. Z = 0 sets to 115.2 kbit/s, see programming table.
3 4
Low Low
High High
X YZ with Y = 1 for 1.627 s Y=0 3/16 bit length DATA
X X
X X
X X
Wait at least 1 s for hold-time. DATA DATA DATA With BR/D = 0, TOIM4232 is in the data communication mode. Both RESET and BR/D must be kept LOW ("0") during data transmission. Reprogramming to a new data rate can be resumed by restarting from step 3. The UART itself also must set to the correct data rate *).
5
Low
Low
*) For programming the UART, refer to e.g., National Semiconductor's data sheet of PC 16550 UART
Document Number 82546 Rev. 1.4, 01-Dec-03
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TOIM4232
Vishay Semiconductors
VISHAY
VCC R3 R4 R6
MAX3232CSE
1 + C3 3 4 + C4 5 11 10 12 9 J1 1 6 2 7 3 8 4 9 5 CON9 ext. input max 3.3 V DC RxD RTS (BR/D) TxD DTR (Reset) VCC J2 1 2 CON2 C1 R1 Y1 Z2 + C2 C8 R2 C2T1IN T2IN R1OUT R2OUT GND T1OUT T2OUT R1IN R2IN 15 14 7 13 8 C+ VCC 16 1 V+ V2 6 + C6 C5 + C7 + 2 3 4 5 6 7 8
TOIMx232
Reset BR/Data RD 232 TD 232 Vcc SD X1 X2 GND
C11 C10 +
TFDU4100
2 4 6 8 IRED Cathode RxD VCC1 GND IRED Anode 1 3 5 7
U1
C1C2+
U2
Vcc RD IR TD IR S2 S1 NC
16 15 14 13 12 11 10 9
U4
TxD NC SC
RD LED TD LED
Application circuit using TFDU4100 with integrated level shifter MAX3232E. When used directly with 3 Vlogic, this one can be omitted
C9
16527
Table 1. Recommended Application Circuit Components
Component 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 Z2 R1 R2 R3 R4 R6 Y1 U1 U2 U3 J1 J2 PCB 9 Pin - D - Sub Power connector VISHAY Dongle_4 Recommended Value 100 nF 10 F, 16 V 100 nF 100 nF 100 nF 100 nF 1 F. 16 V 22 pF 22 pF 6.8 F, 16 V 100 nF 3.6 V 5.6 100 k (up to 1 M, or omitted) 47 20 20 3.686400 MHz MAXIM MAX 3232E TOIM4232 TFDU4100 Cannon Vishay Part Number VJ 1206 Y 104 J XXMT 293D106X9016B2T VJ 1206 Y 104 J XXMT VJ 1206 Y 104 J XXMT VJ 1206 Y 104 J XXMT VJ 1206 Y 104 J XXMT 293D105X9016A2T VJ 1206 A 220 J XAMT VJ 1206 A 220 J XAMT 293D 685X9 016B 2T VJ 1206 Y 104 J XXMT BZT55C3V6 CRCW-1206-5601-F-RT1 CRCW-1206-1003-F-RT1 CRCW-1206-47R0-F-RT1 CRCW-1206-20R0-F-RT1 CRCW-1206-20R0-F-RT1 XT49S - 20 - 3.686400M
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Document Number 82546 Rev. 1.4, 01-Dec-03
VISHAY
TOIM4232
Vishay Semiconductors
R3
MAX3232CSE
1 C+ VCC + C3 3 4 + C4 5 C2GND C1C2+
16
TOIMx232
1 Reset BR/Data RD 232 TD 232 Vcc SD X1 X2 GND C5 + C6 + C7 + 2 3 4
C11
TFDU4300
2 + Cathode 4 6 8 RxD VCC1 GND Anode 1 3 5 7
R4 opt.
U1
V+ V-
2 6
U2
Vcc RD IR TD IR S2 S1 NC
16 15 14 13 12 11 10 9
C10
U4
TxD SD Vlog
15
5 6
11 10 12 9 J1 1 6 2 7 3 8 4 9 5 CON9 ext. input max 3,6V DC
T1IN T2IN R1OUT R2OUT
T1OUT T2OUT R1IN R2IN
14 7 13 8
7 8
RD LED TD LED
RxD DTS (BR/D) TxD DTS (Reset) VCC R1 Y1
Z2 J2 1 2 CON2 C1 + C2 R2
C8
C9
Application circuit using TFDU4300 with an integrated level shifter MAX3232E. When used directly with 3 Vlogic, this one can be omitted
18240
Table 2. Recommended Application Circuit Components
Component 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 Z2 R1 R2 R3 R4 Y1 U1 U2 U3 J1 J2 PCB 9 Pin - D-Sub Power connector VISHAY Dongle_4 Recommended Value 100 nF 10 F, 16 V 100 nF 100 nF 100 nF 100 nF 1 F, 16 V 22 pF 22 pF 6.8 F, 16 V 100 nF 3.6 V 5.6 k 100 k (up to 1 M, or omitted) 47 20 3.686400 MHz MAXIM MAX 3232E TOIM4232 TFDU4300 Cannon Vishay Part Number VJ 1206 Y 104 J XXMT 293D106X9016B2T VJ 1206 Y 104 J XXMT VJ 1206 Y 104 J XXMT VJ 1206 Y 104 J XXMT VJ 1206 Y 104 J XXMT 293D105X9016A2T VJ 1206 A 220 J XAMT VJ 1206 A 220 J XAMT 293D 685X9 016B 2T VJ 1206 Y 104 J XXMT BZT55C3V6 CRCW-1206-5601-F-RT1 CRCW-1206-1003-F-RT1 CRCW-1206-47R0-F-RT1 CRCW-1206-20R0-F-RT1 XT49S - 20 - 3.686400M
Document Number 82546 Rev. 1.4, 01-Dec-03
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TOIM4232
Vishay Semiconductors
VISHAY
Vcc
3 C1 + R13
2 Q4 + C2 Q2
+3,3V
1
R2
R6 RxD RTS
1 3 Q1 1 D4 VB1 1 6 2 7 3 8 4 9 5 SUB-D 9 3 R9 1 D5 D6 D7 3 RXD RTS DTR TXD R5 R1 D1 D2 2 R3 2 1 3 Q3
TxD
R20
Reset
Q1 2 D3
TD232 RD232 BR/D Reset
+3.3 V
Vcc
R12/1 R11
1 2 3 4 5 QZ1 R10 6 7 8 C3 C4
TOIM4232
Reset BR/Data RD 232 TD 232 Vcc SD X1 X2 GND
R12/2 U1 Vcc RD IR TD IR S2 S1 NC RD LED TD LED 16 15 14 13 12 11 10 9 2 4 6 8 IRED cathode Rxd Vcc Gnd U2 Jumper C5 + C6
IRED1
IRED anode Txd NC SC
1 3 5 7
TFDU4100
18082
Install Jumper connection only when VCC SD supplies U2. In that case leave R11 off.
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Document Number 82546 Rev. 1.4, 01-Dec-03
VISHAY
Table 3. Recommended Application Circuit Components
Component 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 21 32 33 34 35 36 37 C1 C2 C3 C4 C5 C6 D1 D2 D4 D5 D6 D7 IRED1 Jumper LED1 LED2 Q1 Q2 Q3 Q4 QZ1 R1 R2 R3 R5 R6 R9 R10 R11 R12 R13 R17 R18 VB1 PCB U1 U2 3.686400 MHz 22 k 10 k 22 k 1 k 47 k 5.6 k 100 k 100 20 1 k 750 750 9 Pin - D- Sub Recommended Value 22 F, 16 V 47 F, 16 V 22 pF 22 pF 100 nF 6.8 F, 16 V
TOIM4232
Vishay Semiconductors
Vishay Part Number 293D 226X9 016C 2T 293D 476X9 016D 2T VJ 1206 A 220 J XAMT VJ 1206 A 220 J XAMT VJ 1206 Y 104 J XXMT 293D 685X9 016B 2T 1N4148 1N4148 BZT55C4V7 1N4148 1N4145 BZT55C3V9 TSHF5400 CRCW-1206-000-F-RT1 TLLY4401 TLLG4401 BC817-25 VP 0610 0T BC817-25 BC817-25 XT49S - 20 - 3.686400M CRCW-1206-2202-F-RT1 CRCW-1206-1002-F-RT1 CRCW-1206-2202-F-RT1 CRCW-1206-1001-F-RT1 CRCW-1206-4702-F-RT1 CRCW-1206-5601-F-RT1 CRCW-1206-1003-F-RT1 CRCW-1206-1000-F-RT1 CRCW-1206-20R0-F-RT1 CRCW-1206-1001-F-RT1 CRCW-1206-7500-F-RT1 CRCW-1206-750-F-RT1 Cannon VISHAY Dongle_3 TOIM4232 TFDU4100
Document Number 82546 Rev. 1.4, 01-Dec-03
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TOIM4232
Vishay Semiconductors Package Dimensions in mm
VISHAY
Package SO16L
10.5 10.1
9.25 8.75 7.5 7.3
2.45 2.25 0.49 0.35 8.89 16 9 0.25 0.10 0.3 0.2
1.27
10.56 10.15
technical drawings according to DIN specifications
13011
1
8
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Document Number 82546 Rev. 1.4, 01-Dec-03
VISHAY
Reel Dimensions
TOIM4232
Vishay Semiconductors
W1
Reel Hub
W2
14017
Tape Width mm 16
A max. mm 330
N mm 50
W1 min. mm 16.4
W2 max. mm 22.4
W3 min. mm 15.9
W3 max. mm 19.4
Document Number 82546 Rev. 1.4, 01-Dec-03
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TOIM4232
Vishay Semiconductors Tape Dimensions in mm
VISHAY
18241
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Document Number 82546 Rev. 1.4, 01-Dec-03
VISHAY
Ozone Depleting Substances Policy Statement
It is the policy of Vishay Semiconductor GmbH to 1. Meet all present and future national and international statutory requirements.
TOIM4232
Vishay Semiconductors
2. Regularly and continuously improve the performance of our products, processes, distribution and operatingsystems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. Vishay Semiconductor GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. Vishay Semiconductor GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use Vishay Semiconductors products for any unintended or unauthorized application, the buyer shall indemnify Vishay Semiconductors against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Vishay Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423
Document Number 82546 Rev. 1.4, 01-Dec-03
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