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參數(shù)資料
| 型號： | RI-RFM-006A-00 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TIRIS RF-Module IC for Automotive |
| 中文描述： | 提里斯射頻集成電路模塊汽車 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 148K |
| 代理商： | RI-RFM-006A-00 |
Rev. 3.5
RI-RFM-006A
TIRIS
RF-Module IC for Automotive
Page 6 of 19
!
Function and Operation
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.
(*) In both transmit and receive modes, this RF-module IC modulates and demodulates signals by logical
operation based on the incorporated master clock. This means that the modulating-demodulating
performance characteristics of this IC are directly affected by the frequency accuracy and variation of its
master clock (normal frequency is 17.1776 MHz). Therefore, the user is requested to select an oscillating
element or an external clock which is compatible with the remote
TIRIS
transponder to be used (see the
section describing the specifications “fexc”, “fL” and “fH”).
2. Sending Mode
In the Sending Mode, the frequency of the IC master clock (normal value: 17.1776 MHz) is divided
by 128. The resulting clock signal then has a frequency of 134.2 kHz (normal value). This resulting signal
is output as a composite signal for “TXHI” and “TXLO” terminals (pins) to drive the MOSFET which is
incorporated as an antenna resonance circuit driver, as illustrated below.
When the IC is in the Receiving Mode, its “TXHI” terminal is fixed at positive level and the “TXLO” at
high impedance. As a result, the output terminal “A” of the MOSFET used as an antenna resonance
circuit driver is fixed at negative level.
Note that when the IC is in the Sending Mode, its “RXDT-“ terminal is always fixed at positive level and
as a consequence, the IC’s FSK signal demodulator remains deactivated although data clock signals,
which are transmitted at a frequency resulting from division of the “A3IN” terminal signal frequency by
16, are output to the “RXCK”.
7
8
RI45538NS
TXLO
TXHI
Master clock frequency divided by 128
(Ref. frequency, resulting: 134.2 kHz)
"A"
MOSFET(PCH)
MOSFET(NCH)
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