PC87427 datasheet(11/46 Pages) NSC

11 / 46 page

1.0 Signal/Pin Connection and Description (Continued)

Revision 1.0

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1.4.5

Fan Monitor & Control (FMC)

DTR1_

BOUT1

100

O4/8

VDD

Data Terminal Ready. When low, indicates to the data transfer

device, e.g., modem, that the UART is ready to establish a

communications link. After a system reset, these pins provide the

DTR function and set these signals to inactive high. Loopback

operation holds them inactive.

Baud Output. Provides the associated serial channel baud rate

generator output signal if Test mode is selected, i.e., bit 7 of

EXCR1 register is set.

DTR2_

BOUT2

DTRM_

BOUTM

108

VSB

RI1

101

INTS

VDD

Ring Indicator. When low, indicates that a telephone ring signal

was received by the modem. These pins are monitored during VDD

power-off for wake-up event detection.

RI2

102

VSB

RTS1

O3/6

VDD

Request to Send. When low, indicates to the modem or other

data transfer device that the corresponding UART is ready to

exchange data. A system reset sets these signals to inactive high,

and loopback operation holds them inactive.

RTS2

RTSM

105

VSB

SIN1

INTS

VDD

Serial Input. Receives composite serial data from the

communications link (peripheral device, modem or other data

transfer device).

SIN2

SINM

104

VSB

SOUT1

O3/6

VDD

Serial Output. Sends composite serial data to the communications

link (peripheral device, modem or other data transfer device).

These signals are set active high after a system reset.

SOUT2

SOUTM

106

VSB

1. DCDM is an output signal due to its role in an exchange connection with an external BMC.

Signal

Pin(s)

I/O Buffer Type Power Well

Description

FANIN0-7

66, 81,

77, 76,

75, 83,

36, 9

IINTS

VDD

Fan Inputs. Used to feed the fan’s tachometer pulse to the

Fan Speed Monitor.

FANOUT0

OD12,O6/12

VDD

Fan Outputs. Pulse Width Modulation (PWM) signals, used to

control the speed of cooling fans by controlling the voltage

supplied to the fans motors.

FANOUT1

FANOUT2

FANOUT3

Signal

Pin(s)

I/O Buffer Type Power Well

Description

PC87427 Datasheet(PDF) 11 Page - National Semiconductor (TI)

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