PC87365 datasheet(27/215 Pages) NSC

27 / 215 page

1.0 Signal/Pin Connection and Description (Continued)

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1.4.13

Strap Configuration

1.4.14

System Hardware Monitoring

Signal

Pin/s

I/O Buffer Type Power Well

Description

BADDR

101

INSTRP

VDD

Base Address. Sampled by the trailing edge of the system reset

to determine the base address of the conﬁguration Index-Data

Ω

resistor.

If no pull-up resistor is connected, it is sampled low, setting the

Index-Data pair at 2Eh-2Fh.

Connecting a 10 K

Ω external pull-up resistor to V

DD would make

it sample high, setting the Index-Data pair at 4Eh-4Fh.

PSLDC0

PSLDC1

107

INSTRP

VSB

1. Make sure that the Serial Port driver is back-drive protected.

Power Supply and LED Conﬁguration. If no pull-up resistor is

connected to these pins, pins 33-35 and 37 function as

PWBTOUT, PSON, PWBTIN and SLPS5,respectively. Connecting

a 10K external pull-up resistor to VSB causes these pins to

function as GPOS0, GPOS1 and GPIS2 and AVI0, respectively.

PSONPOL

109

INSTRP

VSB

Power Supply On Polarity. If no pull-up resistor is connected to

this pin, PSON is set active low with open-drain output.

Connecting a 10K external pull-up resistor to VSB causes PSON

to be set to active high with push-pull output.

TEST

INSTRP

VDD

Test. If sampled high on the trailing edge of system reset, this

signal forces the device into test mode. This pin is for National

Semiconductor use only and should be left unconnected.

To put the chip in Test mode, connect an external pull-up to this

pin. Otherwise, leave it unconnected or connected to the UART

transceiver.

Signal

Pin(s)

I/O

Buffer Type Power Well

Description

ALARM

OD6

VSB

Alarm. Alerts on voltage input mismatch.

AVI0-6

37-43

INAN1

AVDD

Analog Voltage Inputs. Analog inputs of the A/D converter.

D1N

D2N

INAN3

AVDD

Diode Cathode. Diodes 1 and 2 return current sink. Must be

grounded when not used.

D1P

D2P

OAN2

AVDD

Diode Anode. Diodes 1 and 2 current source. Connected to

remote discrete diodes.

OTS1

OTS2

OD6

VSB

Overtemperature Shutdown. Indicates that an overtemperature

was detected. See Section 2.9.10, the SuperI/O Conﬁguration A

remote and local temperature sensing.

VREF

I/O

INAN2, OAN1

AVDD

Reference Voltage. Provides reference voltage for the on-chip

A/D circuits. An external reference voltage should be connected to

this input.

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