Temperature

Sensor

IN0

Addr=20h

Interrupt

Masking

and

Interrupt

Control

InterfaceandControl

AMC80

CH0

CH6

Analog

Inputs

GPI(CI)

INT_IN

BTI

A0/TEST_OUT

SDA

SCL

A1

A2

CH1

CH2

CH3

CH4

CH5

INT

RST_OUTOS

/

Interrupt

Outputs

Serial

Bus

Interface

10-Bit

Delta-Sigma

ADC

FanSpeed

Counter

FAN1

FAN2

NTEST_INRESET_IN

/

Digital

Inputs

and

Outputs

Interrupt

Status

Registers

ValueRAM

IN1

Addr=21h

IN2

Addr=22h

IN3

Addr=23h

IN4

Addr=24h

IN5

Addr=25h

IN6

Addr=26h

Temperature

Addr=27h

Fan1

Addr=28h

Fan2

Addr=29h

UpperLimit

LowerLimit

Watchdog

UpperLimit

LowerLimit

UpperLimit

LowerLimit

UpperLimit

LowerLimit

UpperLimit

LowerLimit

UpperLimit

LowerLimit

UpperLimit

LowerLimit

OS

Hysteresis

UpperLimit

UpperLimit

Hot

Hysteresis

Fan

Tachometer

PulseInputs

GPO

AMC80

SBOS559B – MAY 2011 – REVISED OCTOBER 2015

www.ti.com

7 Detailed Description

7.1 Overview

The AMC80 provides seven analog inputs, a temperature sensor, a delta-sigma analog-to-digital converter

(ADC), and a variety of inputs and outputs on a single chip. A two-wire SMBus interface is also provided. The

AMC80 can continuously perform power-supply, temperature, and fan monitoring for a variety of applications.

The AMC80 is fully pin- and software-compatible with the LM96080 and LM80.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Block Level Description

The AMC80 continuously converts analog inputs to 10-bit resolution using a 2.5-mV least significant bit (LSB)

with a default input range of 0 V to 2.56 V, or a 6-mV LSB with a programmable input range of 0 V to V+. The

analog inputs (CH0 to CH6) are intended for connection to the several power supplies present in any typical

system. Temperature can be converted to a 9-bit or 12-bit resolution with either 0.5°C or 0.0625°C LSB,

respectively. The FAN1 and FAN2 inputs can be programmed to accept either a fan failure indicator or

tachometer signals. Fan failure signals can be programmed to be either active high or active low. Fan inputs

measure the period of tachometer pulses from the the fans, providing a higher count for lower fan speeds. The

fan inputs are digital inputs with transition levels according to the Digital Inputs section of the Electrical

Characteristics table. Full-scale fan counts are 255 (8-bit counter), which represent a stopped or very slow fan.

Nominal speeds, based on a count of 153, are programmable from 1100 RPM to 8800 RPM. Signal conditioning

circuitry is included to accommodate slow rise and fall times.

The AMC80 provides a number of internal registers:

•

Configuration Register: Provides control and configuration.

•

Interrupt Status Registers: Two registers that provide the status of each interrupt alarm.

•

Interrupt Mask Registers: Allows masking of individual interrupt sources, as well as separate masking for

10

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