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TOIM3232
Not for new designs Vishay Telefunken
Integrated Interface Circuits
ULC Technology: High-performance gate array package using dual metal layer CMOS technology, featuring sub-micron channel length (0.8 mm)
Description
The TOIM3232 IC provides proper pulse shaping for the front end infrared transceivers of the 4000-series (4000-series devices are infrared transceiver compliant to the IrDA standard made by Vishay Telefunken), as specified by the IrDA standard. In the transmit mode, the TOIM3232 shortens the RS232 output signal to IrDA compatible electrical pulses to drive the infrared. In the receive mode, the TOIM3232 stretches the received infrared pulses to the proper bit width at the operating bit rate. The IrDA bit rate varies between 2.4 kbit/s to 115.2 kbit/s. The TOIM3232 is using a crystal clock 3.6864 MHz for its pulse stretching and shortening. The clock can be generated by the internal oscillator or an external clock can be used, too. The TOIM3232 is programmable to operate from 1200 bit/s to 115.2kbit/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 infrared IrDA standard applications
D Programmable baud clock generator D D
(1200 Hz to 115 kHz), 13 baud rates SO16L package 3 V and 5 V operation Low operating current
D Directly interfaces the infrared transceiver
TFDx4xxx series to RS232 port
Block Diagram
VCC
TD_232 RD_232
Pulse shaper
TD_IR RD_IR
TD_LED BR/D
Clock generator Logic
RD_LED S1 S2
RESET
VCC_SD
Oscillator
GND Figure 1. Block diagram
Document Number 82521 Rev. A1.1, 02-Apr-01
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TOIM3232
Vishay Telefunken Not for new designs 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 TOIM3232 sets the IrDA default bit rate of 9600, sets pulse width to 1.627 ms. Then the TOIM3232 enters the front-end (TFDS400) power saving mode by setting VCC_SD low and therefore switching off the transceiver. When RESET returns to LOW, the TOIM3232 sets VCC_SD HIGH switching on the front-end device, and sets the new baud rate in the 1.627 ms pulse width mode. In the application the 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. When BR/ D = 0, RD_232 data is transmitted to the IrDA transmitter pin TD_IR, while RD_IR is routed to the transmitter pin TD_232. When BR/ D = 1, data received from the RS232 port is interpreted as the Control Word. The Control Word programs the baud rate and pulse width will be effective as soon as BR/ D return to LOW. Received signal data output of stretched signal to the RS232 port (using level converter). Input of the signal to be transmitted from the RS232 port (passing the level converter). 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 270 current limiting resistor in series to LED to connect to VCC. (VCC = 5 V) Receive LED indicator driver. Use 270 current limiting resistor in series to LED to connect to VCC. (VCC = 5 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 TFDx4xxx Data input from the infrared transceiver TFDx4xxx Supply voltage I/O I Active HIGH
2
BR/ D
I
3 4 5 6 7 8 9 10 11 12 13 14 15 16 *)
RD_232 TD_232 VCC_SD X1 X2 GND TD_LED RD_LED NC S1 S2 TD_IR RD_IR VCC
O I O I I O O
HIGH HIGH LOW
W
LOW LOW
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 82521 Rev. A1.1, 02-Apr-01
TOIM3232
Not for new designs Operation Description
Figure KEIN MERKER shows a typical example of an RS232 port interface. The TOIM3232 connects to an RS232 level converter on one side, and an infrared transceiver on the other. Software can be written to program the TOIM3232 baud rate generator. When BR/D = 0, the TOIM3232 interprets TD_232 data as data transmitted to the TFDS4000. On the other hand, whenever BR/D = 1, the TOIM3232 interprets TD_232 as Control Word. 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. Typical external resistors and capacitors are needed as shown in the TFDx4xxx references. The output pulse length can be programmed, see chapter "Operation Description". To use 1.627 ms output pulses is strongly recommended to save battery power. A resonator like a Matura Ceramic Resonator (CERALOCK(R)) CSAC3.68MGC-TC is recommended. 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 (!). Features of TOIM3232 The baud rate at which an RS232 serial port communicates with the external adapter is programmable inside the TOIM3232. This programmable baud rate is especially useful when the baud clock and the UART oscillator clock are not available and must be regenerated. When BR/D = 0, the TOIM3232 interprets the signals at TD_232 as transmit and RD_IR as received data. On the other hand, whenever BR/D = 1, the TOIM3232 interprets the 7 LSBs at the TD_232 input as the 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.
Vishay Telefunken
Control Byte (8 bit)
Document Number 82521 Rev. A1.1, 02-Apr-01
AAAA A AAAAAAAAAAAAAAAA AA AAA AAAA A A A A A AAAAAAAAAAAAAAAA AA AAA AAAA A A A A AAAAAAAAAAAAAAAA AA AA AAA AAAAAAAAAAAAAAAA AAAAAAAAAAAAA AAAAAAAAAAAAAAAA AA AAA AAAAAAAAAAAAAAAA AA AAA AAAAAAAAAAAAAAAA AA AAA AAAAAAAAAAAAAAAA AA AAA AAAAAAAAAAAAAAAA AA AAA AAAAAAAAAAAAAAAA AA AAA AAAAAAAAAAAAAAAA AA AAA AAAAAAAAAAAAAAAA AA AAA AAAAAAAAAAAAAAAA AA AAA AAAAAAAAAAAAAAAA AA AAA AAAA A A A A AAAAAAAAAAAAAAAA AA AAA AA AAA AAAAAAAAAAAAAAAA AAAAAAAAAAAAA AAAAAAAAAAAAAAAA AA AAA A AAA AAAAAAAAAAAAAAAA AAA A A A AAAAAAAAAAAAAAAA AA AAA A AAA AAAAAAAAAAAAAAAA AAAAAAAAAAAAA AAAAAAAAAAA AAA
AAA A A AAAAAAAAAAAAAAAA A A AA A A A AAAAA AA A A A A A AA A A A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAA AAAAAAAAAAAA AA A A A
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
First Character X 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 0 0 0 0 0 0 0 0 1 1 1 1 1 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
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TOIM3232
Vishay Telefunken Software for the TOIM3232
The control word is composed of two characters, written in hexadecimal, in format: YZ.
Not for new designs
UART Programming
For proper operation, the RS232 must be programmed to send a START bit plus an 8 bit data word, YZ and no STOP bit for every word sent. The transfer rate for programming must be identical with the formerly programmed data rate, or after resetting the TOIM3232, the default rate of 9600 bit/s is used.
Software algorithm
A A AAAA AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AAA A A A A A A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAA A A A A A A AAAA AAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAA AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAA A A A A A A A AAAA AAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAA AAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AAA AAAAAAAAAAAA A A A A AAAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAA A AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A AA AAA AAA AA AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAA
2AAAA X LOWAAAA 3 LOW HIGH X X X X X X X X 4 LOW HIGH YZ with Y = 1 for 1.627 ms Y=0 for 3/16 bit length DATA X X X 5 LOW LOW DATA DATA DATA *) For programming the UART, refer to e.g., National Semiconductor's data sheet of PC 16550 UART.
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Step 1
RESET HIGH
BR/D X
RD_UART TD_UART X X
RD_IR X
TD_IR X
Comments Resets all internal registers. Resets IrDA default data rate of 9600 bit/s. Wait at least 7 ms. Wait at least 7 ms. The TOIM3232 now enters the Control Word (programming) mode. Sending the Control Word YZ. Send `1Z' if 1.627 ms pulses are used. Otherwise send `0Z' if 3/16 bit pulses are used. `Y6' keeps the 9.6 kbit/s data rate, whereas the '0Z' selects the 3/16 bit length pulses. Z = 0 sets to 115.2 kbit/s. Wait at least 1 ms for hold-time. Data communication between the TOIM3232 and the RS232 port has been established by BR/D LOW. The TOIM3232 now enters the data transmission mode. Both RESET and BR/D must be kept LOW (`0') during data mode. Software can reprogram a new data rate by restarting from step 3. The UART also must be set to the correct data rate *).
TOIM3232
Not for new designs Absolute Maximum Ratings Vishay Telefunken
Min. - 0.5 - 0.5 8 0 - 25 Typ. Max. +7 VCC + 0.5 125 70 + 85 230 Unit V V mA C C C C
AAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A AAAA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAA AA A
Supply voltage Input/ output voltage all pins Output sinking current all pins Junction temperature Ambient temperature (operating) Storage temperature Soldering temperature t = 20 s @ 215C Iout Tj Tamb Tstg Tsld 215
Parameter
Symbol VCC
DC Characteristics
Parameter Input HIGH voltage Input LOW voltage Schmitt trigger Positive threshold Negative threshold Input leakage no pull-up/ down Output HIGH voltage Output LOW voltage Current consumption Standby Dynamic
VCC = 5 V 10% **), operating temperature 0
X 70C
AAAA A A A A A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA AAAAAAAAAAAAAAAAAAAAAAAAA AA A AAAA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A A AAAA A A A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA A A A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A A
0.8 VIN = VDD or GND IOH = -3.2 mA IOL = + 3.2 mA VT+ VT- IL 1.1
Test Conditions
Symbol VIH VIL
Min. 2.2
Typ.
Max.
Unit V V V V
"1
"5
1
1.4
mA
V V
VOH VOL ISB IDD
2.4AAAA 0.4
Inputs grounded, no output load *) VCC = 5 V, T = 25C
mA
2
mA
*)
Oscillator inactivated.
**)
Operation at VCC = 3 V is also specified. For data compare TEMIC Matra MHS ULC technology data sheet.
Application
RS232 9 pin connector
DTR RTS TxD RxD
Level converter
Table 1. Recommended Application Circuit Components
TOIM3232
RESET BR/D TD_232 RD_232 X1 100 k X2 VCC_SD TD_IR RD_IR
TFDS4000
VCC TxD RxD
Component
C1 C2 R1 100 k Crystal 3.684 MHz
Recommended Value 22 pF 22 pF
Vishay Part Number
VJ 1206 A 220 J XAMT VJ 1206 A 220 J XAMT CRCW-1206-1003-F-RT1
3.6864 MHz 2 x 22 pF
Figure 2. RS232 Port interface (external infrared adapter)
Document Number 82521 Rev. A1.1, 02-Apr-01
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TOIM3232
Vishay Telefunken Not for new designs
VCC +5V C2 + Q2 R2 R6 RxD D5 VB1
1 6 2 7 3 8 4 9 5
Recommended Circuit Diagram for Using TOIM3232 and TFDS4500 in IR Adapters at the Serial Port
3 C1 + R13 2 Q4
D7
D6 R5 RXD DTR R9 1 D4 RTS R1
1
Q1
RTS Q3 TxD
D1 R3 TXD DTR D2
SUB-D 9
LED 1
LED 2
DO1
DO2
VSS R18 R17
VSS VCC
TxD RxD RTS DTR
R12/1
+5V R11 TOIM3232 U1 R12/2 16 15 14 13 12 11 10 9 Jumper C5 + C6 CO1 1 2 3 4
IRED cathode Rxd Vcc Gnd IRED anode Txd NC (AGCopt.) Sensitivity Reset BR/Data TD 232 X1 X2 GND VCC RD IR TD IR S2 S1 NC RD LED TD LED
1 2
D8
IRED1
3 RD 232 4 QZ1 5 6 7 8 R10 C3 C4
Vcc SD
8 7 6 5
When VCC is used, leave off Jumper.
U2 TFDS4500
When VCC SD from U1 is used, place Jumper and leave off R11 and C6 R02
IREDO1 IREDO2 + C02 -10V
IREDO3
TO1 D03 R01
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. Figure 3. Discrete solution for the interface to the RS232 port
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Document Number 82521 Rev. A1.1, 02-Apr-01
TOIM3232
Not for new designs
Table 1. Recommended Application Circuit Components
Vishay Telefunken
Vishay Part Number VJ 1206 Y 104 J XXMT 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 293D 476X9 016D 2T 1N4148 1N4148 BZT55C4V7 1N4148 1N4145 BZT55C6V2 BZT55C6V8 1N4148 1N4148 1N4145 TSHF5400 TSHF5400 TSHF5400 TSHF5400 CRCW-1206-000-F-RT1 TLLY4401 TLLG4401 BC817-25 VP 0610 0T BC815-25 BC817-25 CRCW-1206-2203-F-RT1 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-1206-1202-F-RT1 CRCW-1206-7500-F-RT1 CRCW-1206-7500-F-RT1 CRCW-1206-75R0-F-RT1 TN0201T
Component C0 C1 C2 C3 C4 C5 C6 C02 D1 D2 D4 D5 D6 D7 D8 D01 D02 D03 IRED1 IRED01 IRED02 IRED03 Jumper LED1 LED2 Q1 Q2 Q3 Q4 R0 R1 R2 R3 R5 R6 R9 R10 R11 R12 R13 R17 R18 R02 T01
Recommended Value 100 nF 22 mF, 16 V 47 mF, 16 V 22 pF 22 pF 100 nF 6.8 mF 47 mF, 16 V
MOSFET
220 k 22 k 10 k 22 k 1 k 47 k 5.6 k 100 k
100 20
12 k 750 750 75
Document Number 82521 Rev. A1.1, 02-Apr-01
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TOIM3232
Vishay Telefunken Package Information
Package SO16L
Dimensions in mm
10.5 10.1 9.25 8.75 7.5 7.3
Not for new designs
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 82521 Rev. A1.1, 02-Apr-01
TOIM3232
Not for new designs 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.
Vishay Telefunken
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 82521 Rev. A1.1, 02-Apr-01
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