1

16 15 14 13

12

11

10

9

8

7

6

5

4

3

2

RF1

TCLK

TDAT

TEN

CLK_AM

SPI_CLK

SPI_SIMO

SPI_SOMI

TMS37157

www.ti.com

SWRS083A – SEPTEMBER 2009 – REVISED NOVEMBER 2009

PIN CONFIGURATION

TERMINAL FUNCTIONS

TERMINAL

I/O

DESCRIPTION

NAME

NO.

RF1

1

I

Antenna

Test interface - clock input. Data is shifted in and out of the TDAT pin on the rising edge of

TCLK

2

I

TCLK.

TDAT

3

I/O

Test interface – bidirectional serial data I/O for configuration and trimming.

TEN

4

I

Test interface – enable input.

EOB

5

O

End of burst detector. This signal is high when the RF signal of the base station is OFF.

NPOR

6

O

Active low power-on-reset (open drain) - can be used to reset the microcontroller.

PUSH

7

I

Input of the push button detector – can be used to recognize that a push event has occurred.

Indicates internal control unit activity:

•

During initialization

BUSY

8

O

•

During transponder operation

•

During SPI communication (handshaking)

This output provides clock signals derived from the external antenna resonance circuit to the

CLKA_M

9

O

microcontroller. This function can be activated by an SPI command. Two frequencies are

selectable FRES and FRES/4.

SPI_CLK

10

I

SPI clock input

SPI_SOMI

11

O

SPI data output

SPI_SIMO

12

I

SPI data input

VBATI

13

PWR

Can be used as

μC supply voltage

VBAT

14

PWR

Battery supply

GND

15

PWR

Ground

VCL

16

PWR

Charge capacitor

ORDERING INFORMATION

ORDERABLE PART NUMBER

TOPSIDE MARKING

–40°C to 85°C VQFN – RSA

Reel of 3000

TMS37157IRSARG4

37157I

(1)

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

(2)

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

website at www.ti.com.

Copyright © 2009, Texas Instruments Incorporated

Submit Documentation Feedback

3

Product Folder Link(s): TMS37157