PCI1221 datasheet(25/123 Pages) TI

25 / 123 page

PCI1221 GHK/PDV

PC CARD CONTROLLERS

SCPS042 – JULY 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

P2C power-switch interface (TPS2202A/2206)

The PCI1221 provides a P2C (PCMCIA Peripheral Control) interface for control of the PC Card power switch.

The CLOCK, DATA, and LATCH terminals interface with the TI TPS2202A/2206 dual-slot PC Card power

interface switches to provide power switch support. Figure 2 shows the terminal assignments of the TPS2206,

and Figure 3 illustrates a typical application where the PCI1221 represents the PCMCIA controller.

5 V

DATA

CLOCK

LATCH

RESET

12 V

AVPP

AVCC

GND

RESET

3.3 V

5 V

12 V

BVPP

BVCC

3.3 V

NC – No internal connection

Figure 2. TPS2206 Terminal Assignments

The CLOCK terminal on the PCI1221 can be an input or an output. The PCI1221 defaults the CLOCK terminal

as an input to control the serial interface and the internal state machine. The P2CCLK bit in the system control

the PCI clock. When the system design implements CLOCK as an output from the PCI1221, an external pull

down is required.

PCI1221

(PCMCIA

Controller)

12 V

Power Supply

VPP1

VPP2

VCC

PC Card

TPS2206

5 V

3.3 V

CLOCK

VPP1

VPP2

VCC

PC Card

12 V

5 V

3.3 V

AVPP

AVCC

BVPP

BVCC

AVCC

Supervisor

RESET

DATA

LATCH

Figure 3. TPS2206 Typical Application

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