TPIC84134-Q1

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SLDS176 – AUGUST 2010

DEVICE INFORMATION

The TPIC84134 is designed to control Passive Entry, Passive Start (PEPS) systems as a part of the central body

control module. Functionally, the TPIC84134 transmits a magnetic field signal via antenna coils located

throughout the vehicle. The data is transmitted using amplitude shift keying (ASK). Such a signal is received by

an external RFID card or key, which then activates the card or key to then process and send an authenticating

signal back to the vehicle, thus authenticating the driver. Once authenticated, the driver is able to open doors or

start the vehicle depending on the systems specific configuration. In general, the antenna load of the TPIC84134

is a coil, which generates a magnetic field which is high enough to transmit data to the ID card, and accurate

enough for location recognition outside of the vehicle.

Functional Description

Power Management

•

The accuracy of the output voltage in data and destroy modes, because the sine wave signal is derived from

•

The accuracy of the current measurements, because the Current Measurement (ADC) reference voltage is

•

NOTE

resistance determines:

•

•

Clock Divider

The Clock Divider generates a 2.1472 MHz internal clock signal from the external clock. The internal clock

frequency is used for:

•

Clearing and latching the fault bits within Control and Status Register (CSR).

•

For generating the frequency of the sine wave

The divider can be programmed to either: /1, /2, /4, /8, with the default being /8. Table 1 shows the possible

CLK_IN input frequencies to generate 134.2 kHz signal.

Table 1. Clock Divider

Divider

CLK_IN

/1

2.1472 MHz

/2

4.2944 MHz

/4

8.5888 MHz

/8 (default)

17.1776 MHz

Copyright © 2010, Texas Instruments Incorporated

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