PCI1225 Datasheet, PDF (25/131 Pages) Texas Instruments – PC CARD CONTROLLERS

PCI1225 GHK/PDV
PC CARD CONTROLLERS
SCPS035B – MAY 1998 – REVISED – MAY 2000
P²C power-switch interface (TPS2202A/2206)
The PCI1225 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 PCI1225 represents the PCMCIA controller.
5V
1
5V
2
DATA
3
CLOCK
4
LATCH
5
RESET
6
12 V
7
AVPP
8
AVCC
9
AVCC
10
AVCC
11
GND
12
NC
13
RESET
14
3.3 V
15
30
5V
29
NC
28
NC
27
NC
26
NC
25
NC
24
12 V
23
BVPP
22
BVCC
21
BVCC
20
BVCC
19
NC
18
OC
17
3.3 V
16
3.3 V
NC – No internal connection
Figure 2. TPS2206 Terminal Assignments
The CLOCK terminal on the PCI1225 can be an input or an output. The PCI1225 defaults the CLOCK terminal
as an input to control the serial interface and the internal state machine. The P2CCLK bit in the system control
register can be set by the platform BIOS to enable the PCI1225 to generate and drive the CLOCK internally from
the PCI clock. When the system design implements CLOCK as an output from the PCI1225, an external
pulldown is required.
Power Supply
12 V
5V
3.3 V
Supervisor
PCI1225
(PCMCIA
Controller)
TPS2206
12 V
AVPP
5V
3.3 V
AVCC
RESET
RESET
AVCC
AVCC
CLOCK
DATA
LATCH
BVPP
BVCC
BVCC
BVCC
VPP1
VPP2
VCC
VCC
PC Card
A
VPP1
VPP2
VCC
VCC
PC Card
B
Figure 3. TPS2206 Typical Application
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