DBT PACKAGE

(TOP VIEW)

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10

21

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TDAT

TEN

RF2

NPOR

RF3

VCC_CU

WDEEN

VBAT

VBATI

NC

TCLK

RF1

VCL

AM_MOD

GND

RSSI

WAKE

BUSY

CLKA/M

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12

13

14

15

NC

NC

NC

MOD

TX

16

17

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20

NC

NC

SPI_SIMO

SPI_SOMI

SPI_CLK

EOBA

TMS37126

SCBS880 – MAY 2012

www.ti.com

The embedded DST80 immobilizer interface offers a high level of security through its hardware encryption

coprocessor and can also handle mutual authentication schemes. It operates without a battery and can be

accessed in terms of its memory and encryption through the SPI interface. Power management features include

battery charge and check as well as a battery backup function, which allows operation of all functions with low or

even no battery as long as there is sufficient energy from the LF field.

The Passive Entry (PE) device manages the immobilizer communication and LF wake reception. The special

high-Q design achieves communication ranges up to 3 m for the PE link with outstanding low standby current on

the receiver side. The front end offers flexible configuration of two different wake patterns of 0, 4, 8 or 16 bit

length. Each channel can be adjusted in sensitivity and resonance frequency, which results in reproducible

system designs. Security keys and rolling codes can be stored in the integrated EEPROM memory. This memory

is accessible over the LF interface without support from the battery in the key fob and over the SPI interface. The

PE device offers a special battery backup mode to operate the microcontroller without battery support. The

external resonant circuit with an LF coil and a resonant capacitor can be trimmed to the correct resonant

frequency with the integrated trimming capability, eliminating part tolerances.

ORDERABLE PART NUMBER

-40°C to 85°C

TSSOP – DBT

TMS37126D3XDBTRG4

(1)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

(2)

Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

2

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Copyright © 2012, Texas Instruments Incorporated

Product Folder Link(s): TMS37126