CF45538NSRG4 Datasheet, PDF (6/19 Pages) Texas Instruments – TIRIS RF-Module IC for Automotive

Description of Pins
5 Description of Pins
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Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Signal
A3OP
A3IN
A2OP
A2IN
A1OP
A1IN
TXLO
TXHI
OSCI
OSCO
GND
VCC
TPC
TXCT–
RXDT–
RXCK
I/O
Description
O
Signal output from CMOS inverter-3 amplifier; this pin is connected to the internal FSK
signal digital demodulator.
I
Signal input to CMOS inverter-3 amplifier; if an external circuit is used to amplify FSK
signals, the amplified signals are input through this pin.
O
Signal output from CMOS inverter-2 amplifier.
I
Signal input to CMOS inverter-2 amplifier.
O
Signal output from CMOS inverter-1 amplifier.
I
I 16. Signal input to CMOS inverter-1 amplifier.
Negative
open drain
output
Negative level output of transmission signals; this output drives the n-channel MOSFET
used as antenna driver.
Positive open Positive level output of transmission signals; this output drives the p-channel MOSFET
drain output used as antenna driver.
I
Signal input to 17.1776 MHz master clock oscillator.
O
Signal output from 17.1776 MHz master clock oscillator.
–
Negative power supply.
–
Positive power supply.
I, w/pull-up Input of transmission power selection signals (High-Low). A Low level signal input
resistor through this pin substantially lowers the power during transmission
I, w/pull-up
resistor
Input of transmission output control signals (Transmit-Receive Mode Selector). A Low
level signal input through this pin outputs a transmission signal to either “TXLO/TXHI”
pin while a High level signal input turns the mode to Receive and activates the internal
FSK signal digital demodulator.
O
Serial output of demodulated FSK signal bit data. Negative level output when the bit
data received from the remote transponder is “1”, and positive level output when it is
“0”.
Note: The RI-RFM-006A has a reverse polarity in relation to TIRIS standard
RF-modules.
O
Synchronous clock output of demodulated FSK signal data; a clock signal synchronized
with the “RXDT-“ signal is output.
6 Function and Operation
6.1 General
This RF-module IC counts on two operating modes:
Sending Mode – This mode is active when the “TXCT–“ pin is set to L-level. A remote TIRIS
transponder can be charged up and ID code can be sent to that transponder in this mode.
Receiving Mode – This mode is active when the “TXCT–“ pin is set to H-level. FSK signals sent from a
remote TIRIS transponder are received and demodulated in this mode.
Therefore, by switching over these modes using an external controller, data communications with a TIRIS
transponder can be made.
Note that this RF-module IC is exclusively designed to provide the user with a simple signal
modulator-demodulator (modem) function for data communications with a remote TIRIS transponder,
based on the appropriate data modulation-demodulation specifications. And therefore, it does not
incorporate error detection, data allotment nor other similar data processing functions in terms of protocol
and data formats.
6
TIRIS RF-Module IC for Automotive
SCBU036 – December 1996
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