Datasheet
TPS2231
TPS2236
SLVS536J –JULY 2004–REVISED SEPTEMBER 2009..................................................................................................................................................
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TERMINAL FUNCTIONS
TERMINAL
TPS2231 TPS2236
I/O DESCRIPTION
NAME NO. NAME NO.
PW PWP RGP DAP
3.3VIN 4, 5 5, 6 2 3.3VIN 8, 9 I 3.3-V input for 3.3VOUT
1.5VIN 15, 16 18, 19 12 1.5VIN 24, 25 I 1.5-V input for 1.5VOUT
AUXIN 18 21 17 AUXIN 15 I AUX input for AUXOUT and chip power
GND 10 11 7 GND 21 Ground
Switched output that delivers 0 V, 3.3 V or high impedance to
3.3VOUT 6, 7 7, 8 3 3.3VOUT1 7 O
card
Switched output that delivers 0 V, 1.5 V or high impedance to
1.5VOUT 13, 14 16, 17 11 1.5VOUT1 26 O
card
Switched output that delivers 0 V, AUX or high impedance to
AUXOUT 17 20 15 AUXOUT1 14 O
card
Switched output that delivers 0 V, 3.3 V or high impedance to
3.3VOUT2 10 O
card
Switched output that delivers 0 V, 1.5 V or high impedance to
1.5VOUT2 23 O
card
Switched output that delivers 0 V, AUX or high impedance to
AUXOUT2 16 O
card
System Reset input – active low, logic level signal. Internally
SYSRST 1 2 6 SYSRST 30 I
pulled up to AUXIN.
Card Present input for PCI Express cards. Internally pulled up to
CPPE 12 15 10 CPPE1 1 I
AUXIN
CPUSB 11 14 9 CPUSB1 3 I Card Present input for USB cards. Internally pulled up to AUXIN.
Card Present input for PCI Express cards. Internally pulled up to
CPPE2 2 I
AUXIN.
CPUSB2 6 I Card Present input for USB cards. Internally pulled up to AUXIN.
PERST 8 9 8 PERST1 13 O A logic level power good to slot 0 (with delay)
PERST2 11 O A logic level power good to slot 1 (with delay)
Shutdown input – active low, logic level signal. Internally pulled
SHDN 2 3 20 SHDN1 17 I
up to AUXIN.
Shutdown input – active low, logic level signal. Internally pulled
SHDN2 18 I
up to AUXIN.
Standby input – active low, logic level signal. Internally pulled up
STBY 3 4 1 STBY1 28 I
to AUXIN.
Standby input – active low, logic level signal. Internally pulled up
STBY2 27 I
to AUXIN.
Reference Clock Enable signal. As an output, a logic level power
good to host for slot 0 (no delay – open drain). As an input, if
RCLKEN 19 22 18 RCLKEN1 32 I/O
kept inactive (low) by the host, prevents PERST from being
de-asserted. Internally pulled up to AUXIN.
Reference Clock Enable signal. As an output, a logic level power
good to host for slot 1 (no delay – open drain). As an input, if
RCLKEN2 31 I/O
kept inactive (low) by the host, prevents PERST from being
de-asserted. Internally pulled up to AUXIN.
OC 20 23 19 OC1 19 O Overcurrent status output for slot 0 (open drain)
OC2 20 O Overcurrent status output for slot 1 (open drain)
1, 10, 4, 5, 4, 5,
NC 9 12, 13, 13, 14, NC 12, 22, No connection
24 16 29
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