TPS9125

5 V/3 V SIM SUPPLY AND LEVEL SHIFTERS

SLVS244A – SEPTEMBER 1999 – REVISED NOVEMBER 1999

2

POST OFFICE BOX 655303

functional block diagram

Voltage

Generator

(Charge Pump)

Control

Block

OSC

800 kHz

VREF

Control

Block

Level

Shifter

ESD

ESD

ESD

VCAP1

VCAP2

SIMPWR

MODE

RESET

DATA

CLK

RST

GND

SIMVCC

SIMDATA

SIMCLK

SIMRST

VDD or

SIMVCC

VDD

10 k

Ω

20 k

Ω

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

CLK

6

DI

3-V SIM clock signal. This terminal is connected to the SIM interface and works with 3-V logic level.

DATA

5

DI/O

3-V bidirectional data line. This terminal is connected to the SIM interface and works with 3-V logic level.

GND

10

Ground

MODE

3

DI

Programs the SIM supply voltage to SIMVCC = 5 V (MODE = 0) or SIMVCC = 3 V (MODE = 1).

RESET

2

DI

Reset for the TSP9125 SIM supply and interface in case the SIM is removed under operation.

RST

7

DI

3-V SIM reset signal. This terminal is connected to the SIM interface and works with 3-V logic level.

SIMCLK

9

DO

3-V/5-V SIM clock signal. This terminal is connected to the SIM reader contacts.

SIMRST

8

DO

3-V/5-V SIM reset signal. This terminal is connected to the SIM reader contacts.

SIMDATA

11

DI/O

3-V/5-V bidirectional data line. This terminal is connected to the SIM reader contacts.

SIMVCC

14

SIM supply voltage. Can be switched between 5 V

±10% and 3 V ±10%. This terminal is connected to the SIM

reader contacts. Connect a 1

µF ±20% capacitor between SIMVCC and GND.

SIMPWR

4

DI

SIM supply enable terminal. SIMPWR = 0 leaves SIMVCC open, SIMPWR = 1 enables SIM supply.

VCAP1

13

Charge pump capacitor. Connect 220 nF

±20% capacitor between VCAP1 and VCAP2.

VCAP2

12

Charge pump capacitor. Connect 220 nF

±20% capacitor between VCAP1 and VCAP2.

VDD

1

Supply voltage input. Connect a power bypass capacitor of 1

µF between VDD and GND. Connect capacitor

physically close to the VDD terminal.