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TOIM4232 Dataheets PDF



Part Number TOIM4232
Manufacturers Vishay Siliconix
Logo Vishay Siliconix
Description SIR Endec for IrDA Applications Integrated Interface Circuit
Datasheet TOIM4232 DatasheetTOIM4232 Datasheet (PDF)

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 µm). Description The TOIM4232 Endec IC provides proper pulse shaping for the SIR IrDA® 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 infr.

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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 µm). Description The TOIM4232 Endec IC provides proper pulse shaping for the SIR IrDA® 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 µs 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® 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 µs 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 www.vishay.com 1 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 µs. 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 µs. 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 Ω current limiting resistor in.series to LED to connect to VCC. (VCC = 3.3 V) Receive LED indicator driver. Use 180 Ω 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 µs **) 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 kΩ 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 kΩ is used to accelerate the start of osc.


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