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TOIM4232
Vishay Telefunken
SIR Endec for IrDA Applications Integrated Interface Circuits
ULC Technology: High-performance gate array package using multiple metal layer CMOS technology featuring sub-micron channel lengths (0.35 mm)
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 ms 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.
Features
D Pulse shaping function (shortening and stretching)
used in SIR IrDA(R) applications
D 3/16 bit pulse duration or 1.627 ms pulse selectable D SO16 - package D 3 V operation voltage, 5 V tolerant inputs D Low operating current
D Directly interfaces the SIR transceiver
TFD..- series to an RS232 port
D Programmable baud clock generator
(1200 Hz to 115.2 kHz), 13 baud rates
Block Diagram
VCC
TD_232
TD_IR
Endec
RD_232 RD_IR
TD_LED BR/D
Baud Generator Logic
RD_LED S1 S2
RESET
VCC_SD
Oscillator
GND
X1
X2
Figure 1. Block diagram
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TOIM4232
Vishay Telefunken Pin Assignment and Description
Pin 1 Symbol RESET Function 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 ms. 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. The internal oscillator is stopped during RESET active. RESET pin can be controlled by either the RTS or DTR line through RS232 level converter. Minimum hold time for reset: 1 ms. 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 Supply voltage I/O I Active HIGH
2
BR/ D
I
3 4 5
RD_232 TD_232 VCC_SD
O I O
HIGH HIGH LOW
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 O O LOW LOW
W
W
O O O I I
LOW LOW HIGH LOW
Crystal should be connected as shown in figure 2. In addition connect a 100 kW 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.
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Document Number 82546 Rev. A1.0, 15-Mar-01
TOIM4232
Vishay Telefunken Application circuit
RS232 9 pin connector
DTR RTS TxD RxD
Level converter
TOIM4232
RESET BR/D TD_232 RD_232 X1 100 k X2 VCC_SD TD_IR RD_IR
TFDS4000 TFDU4100 TFDS420x
VCC TxD RxD
3.6864 MHz 2 x 22 pF
Figure 2. RS232 Port interface (external infrared adapter) 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-20-3-3.686400M
Absolute Maximum Ratings
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Iout Tj Tamb Tstg Tsldr all pins all pins all pins -25 -25 215 125 85 85 230 t = 20 s @ 215C
Parameter Supply voltage Input voltage Output voltage Output sinking current Junction temperature Ambient temperature (operating) Storage temperature Soldering temperature
Symbol VCC
Min. - 0.5 - 0.5 - 0.5 8
Typ.
Max. 3.6 5.5 VCC + 0.5
Unit V V V mA C C C C
Notes
DC Characteristics
Parameter Operating voltage Parameter Input HIGH voltage
Symbol VCC Symbol VIH VIL Vhyst IL VOH VOH VOL ISB ICC
Min. 3.0 Min.
Typ. 3.3 Typ. 1.7
Max. 3.6 Max. 2.0
Unit V Unit V
Notes
VCC = 3.3 V 5%, operating temperature = -25C to 85C
Notes Inputs tolerate levels as high as 5.5 V max. All inputs are Schmitt trigger inputs
Input LOW voltage Input Schmitt trigger hysteresis Input leakage no pull-up/down Output HIGH voltage g Output LOW voltage Consumption Current Standby Dynamic
0.8
-10 2.0 2.4
"1
1.1 0.6
V V V V V
10
mA
0.4 1
mA
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 = 25C
2
mA
Document Number 82546 Rev. A1.0, 15-Mar-01
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TOIM4232
Vishay Telefunken 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 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 ms output pulses to save battery 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)
0 0 0 0 0 0 0 0 1 1 1 1 1
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where X: S1, S2: S0: B0 .. B3: Do not care User programmable bit to program the outputs S1 and S2 IrDA pulse select = (1) 1.627 ms output pulses = (0) 3/16 bit time pulses, not recommended Baud rate select words
X
First Character S2 S1 S0
Second character B3 B2 B1 B0 LSB
Baud Rate Select Words
Note: IrDA standard only supports 2.4, 9.6, 19.2, 57.6, and 115.2 kbit/s. B3 B2 0 0 0 0 1 1 1 1 0 0 0 0 1 B1 0 0 1 1 0 0 1 1 0 0 1 1 0 B0 0 1 0 1 0 1 0 1 0 1 0 1 0 2nd Char 0 1 2 3 4 5 6 7 8 9 A B C 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
Document Number 82546 Rev. A1.0, 15-Mar-01
TOIM4232
Vishay Telefunken Software for the TOIM4232 UART Programming
For proper operation, the RS232 must be programmed (using 8 bit, 1 stop, 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.
Software algorithm
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Step RESET BR/D RD_UART TD_UART RD_IR TD_IR Description and Comments 1 HIGH X X X X X Resets all internal registers. Resets to IrDA default data rate of 9600 bit/s. 2 LOW X X X X X Wait at least 7 ms. 3 LOW HIGH X X X X Wait at least 7 ms. TOIM4232 now is set to the Control Word programming mode. 4 LOW HIGH YZ X X X Sending the Control Word YZ. with Examples: Y=1 Send `1Z' if 1.627 ms pulses are intended for to be used. Otherwise send `0Z' for 3/16 1.627 ms bit period pulses. `Y6' keeps the 9.6 kbit/s Y=0 data rate. Z = 0 sets to 115.2 kbit/s, 3/16 bit see programming table. length Wait at least 1 ms for hold-time. 5 LOW LOW DATA 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 be set to the correct data rate *). For programming the UART, refer to e.g., National Semiconductor's data sheet of PC 16550 UART. *)
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TOIM4232
Vishay Telefunken Package Information
Package SO16L
Dimensions in mm
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 10.56 10.15
1.27
technical drawings according to DIN specifications
13011
1
8
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Document Number 82546 Rev. A1.0, 15-Mar-01
TOIM4232
Vishay Telefunken Recommended Application Circuits
VCC R3 R4 R6
MAX3232E
1 C3 1F C+ VCC 16 C5 V+ V- 2 6 C6 5 15 1 2
C11
TOIM4232
+ + C7
3 4 5 6 Reset BR/Data RD 232 TD 232 Vcc SD X1 X2 GND
TFDU4100
2
+
3 4 C1- C2+
U1
U2
Vcc RD IR TD IR S2 S1 NC RD LED TD LED
16 15 14 13 12 11 10 9
C10
+
IRED Cathode RxD VCC1 GND
IRED Anode TxD
1 3 5
4 6 8
U4
NC 7 SC
C4 1F
+ +
C2- GND
11 T1IN 10 T2IN 12 R1OUT 9 R2OUT J1 1 6 2 7 3 8 4 9 5 CON9
T1OUT T2OUT R1IN R2IN
14 7 13 8
7 8
RxD RTS (BR/D) TxD DTR (Reset) VCC VCC J2 ext. 1 input 2 3.3 V DC CON2 Z1 C1 R1 Y1
Z2
+ C2
C8
R2
C9
16527
Figure 3. Application circuit using TFDU4100 with an integrated level shifter MAX3232E. When used directly with 3 V logic, this one can be emitted
VCC R3 R4 R6
MAX3232E
1 C3 1F C+ VCC 16 C5 V+ V- 2 6 C6 5 15 1 2
C11
TOIM4232
+ + C7
3 4 5 6 Reset BR/Data RD 232 TD 232 Vcc SD X1 X2 GND
TFDU4500
1
+
3 4 C1- C2+
U1
U2
Vcc RD IR TD IR S2 S1 NC RD LED TD LED
16 15 14 13 12 11 10 9
C10
+
IRED Cathode RxD VCC1 GND
IRED Anode TxD
8 7 6
2 3 4
U3
NC 5 SC
C4 1F
+ +
C2- GND
11 T1IN 10 T2IN 12 R1OUT 9 R2OUT J1 1 6 2 7 3 8 4 9 5 CON9
T1OUT T2OUT R1IN R2IN
14 7 13 8
7 8
RxD RTS (BR/D) TxD DTR (Reset) VCC VCC J2 ext. 1 input 2 3.3 V DC CON2 Z1 C1 R1 Y1
Z2
+ C2
C8
R2
C9
16528
Figure 4. Application circuit using TFDU4500 with an integrated level shifter MAX3232E. When used directly with 3 V logic, this one can be emitted
Document Number 82546 Rev. A1.0, 15-Mar-01
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TOIM4232
Vishay Telefunken
Table 2. Recommended Application Circuit Components
Component C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 Z1 Z2 R1 R2 R3 R4 R6 Y1 U1 U2 U3, U4 J1 J2
Recommended Value 100 nF 10 mF, 16 V 100 nF 100 nF 100 nF 100 nF 10 mF, 16 V 22 pF 22 pF 6.8 mF, 16 V 100 nF 3.6 V 3.6 V
5.6 k 100 k,
Vishay Part Number VJ 1206 Y 104 J XXMT 293D 106X9 016B 2T VJ 1206 Y 104 J XXMT VJ 1206 Y 104 J XXMT VJ 1206 Y 104 J XXMT VJ 1206 Y 104 J XXMT 293D 105X9 016A 2T VJ 1206 A 220 J XAMT VJ 1206 A 220 J XAMT 293D 685X9 016B 2T VJ 1206 Y 104 J XXMT BZT55C3V6 BZT55C3V6 CRCW-1206-5601-F-RT1 CRCW-1206-1003-F-RT1 CRCW-1206-47R0-F-RT1 CRCW-1206-27R0-F-RT1 CRCW-1206-27R0-F-RT1 XT49S-20-3.686400M MAXIM MAX 3232E TOIM4232 TFDS4500 or TFDS4100 Cannon
optional, for reducing oscillator start up time
47 k 27 k 27 k
3.686400 MHz
9 Pin - Connector Connector
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Document Number 82546 Rev. A1.0, 15-Mar-01
TOIM4232
Vishay Telefunken
Recommended Circuit Diagram for Using TOIM4232 and TFDS4500 in IR Adapters at the Serial Port
Vcc 3 C1 + R13 2 Q4 1 1 3 1 D5 VB1
1 6 2 7 3 8 4 9 5 +3,3V
C2 +
Q2
R2
R6
RxD RTS
3 Q1 2 1 2 D2 Q3
TxD
D7 3
D6 R5
RXD RTS TXD DTR
R1 D1
R3
R9
1
DTR
SUB-D 9 LED 1 LED 2
D4 3
R18
R17
DTR
RTS
RxD
TxD
+3.3 V
Vcc
R12/1 R11
TOIM3232
1 2 3 4 QZ1 5 6 7 R10 8 Reset BR/Data RD 232 TD 232 Vcc SD X1 X2 GND Vcc RD IR TD IR S2 S1 16 15 14 13 12 11 10 9
R12/2
IRED1
1 2 3 4
IRED cathode Rxd Vcc Gnd
IRED anode Txd NC (AGCopt.) Sensitivity
8 7 6 5
U1
NC RD LED TD LED
U2
C3
C4
When VCC is used, leave off Jumper When VCC SD from U1 is used, place Jumper and leave off R11 and C6
Jumper C5
+ C6
TFDS4500
Due to the very limited power to be drawn out of the RS232 port, it is recommended to operate the LEDs for displaying the state of transmission (D3, D4) with lowest possible current or not to use this function without external power supply. PCB layout, Gerber plots, component list, and control software are available on request.
Circuit diagram refers to TOIM3232. The operating voltage for the TOIM4232 is reduced to 3.3 V typical. Therefore the equivalent component values have to be adapted. Figure 5. Discrete solution for the interface to the RS232 port
Document Number 82546 Rev. A1.0, 15-Mar-01
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TOIM4232
Vishay Telefunken
Table 3. Recommended Application Circuit Components
Component 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
Recommended Value 22 mF, 16 V 47 mF, 16 V 22 pF 22 pF 100 nF 6.8 mF, 16 V
3.686400 MHz
22 k 10 k 22 k 1 k 47 k 5.6 k 100 k,
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-1206-7500-F-RT1 Cannon
optional, for reducing oscillator start up time 100 20
1 k 750 750 Sub-D9
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Document Number 82546 Rev. A1.0, 15-Mar-01
TOIM4232
Vishay Telefunken 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. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems 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 Telefunken products for any unintended or unauthorized application, the buyer shall indemnify Vishay Telefunken 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. A1.0, 15-Mar-01
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