DBT PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

9

10

21

22

23

24

25

26

27

28

29

30

TDAT

TEN

EOB

NPOR

PUSH

BUSY

P2.3

P2.4

P1.0

P1.1

TCLK

RF

VCL

GND

VBAT

VBATI

P2.2

P2.0

RESET

XIN

11

12

13

14

15

P1.2

P1.4

P1.5

P1.6

P1.7

16

17

18

19

20

XOUT

VSS

P2.5

VCC

TEST

TMS37F158

SCBS877 – MAY 2012

www.ti.com

The CED80 manages the immobilizer communication and push-button interaction. During sleep state, the device

enters a special low-power mode with only 60 nA of current consumption. By sensing the pressing of a push

button, the device wakes up and controls an external UHF transmitter or UHF transceiver. 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 keyfob or by the internal microcontroller if the battery is functional. The

CED80 offers a special battery-charge mode; to achieve faster charging, it is recommend to add a charging

amplifier device on the base station side. 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, which eliminates part

tolerances.

The small DBT 30-pin package together with only a few external components results in cost-efficient design.

ORDERABLE PART NUMBER

–40°C to 85°C

TSSOP – DBT

TMS37F158LGIDBTRG4

(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): TMS37F158