ADM1032 查看數據表（PDF） - Analog Devices

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ADM1032

±1°C Remote and Local System Temperature Monitor

Analog Devices 

ADM1032

1. Although it is possible to read a data byte from a data register

without first writing to the Address Pointer Register, if the

Address Pointer Register is already at the correct value, it is

not possible to write data to a register without writing to the

Address Pointer Register, because the first data byte of a

write is always written to the Address Pointer Register.

2. Don’t forget that some of the ADM1032 registers have differ-

ent addresses for read and write operations. The write address

of a register must be written to the Address Pointer if data is

to be written to that register, but it is not possible to read

data from that address. The read address of a register must

be written to the Address Pointer before data can be read

from that register.

1

9

1

9

SCLK

SDATA

A6

START BY

MASTER

A5 A4 A3 A2 A1 A0

FRAME 1

SERIAL BUS ADDRESS BYTE

R/W

D7

ACK. BY

ADM1032

D6 D5 D4 D3 D2 D1 D0

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

ADM1032

1

9

SCLK (CONTINUED)

SDATA (CONTINUED)

D7 D6 D5 D4 D3 D2 D1 D0

FRAME 3

DATA BYTE

ACK. BY STOP BY

ADM1032 MASTER

Figure 3a. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register

1

9

1

9

SCLK

A6

SDATA

START BY

MASTER

A5 A4 A3 A2 A1 A0 R/W

D7

FRAME 1

SERIAL BUS ADDRESS BYTE

ACK. BY

ADM1032

D6 D5 D4 D3 D2 D1 D0

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY STOP BY

ADM1032 MASTER

Figure 3b. Writing to the Address Pointer Register Only

1

SCLK

9

1

9

SDATA

A6

START BY

MASTER

A5 A4 A3 A2 A1 A0 R/W

D7 D6

FRAME 1

SERIAL BUS ADDRESS BYTE

ACK. BY

ADM1032

D5 D4 D3 D2 D1

FRAME 2

DATA BYTE FROM ADM1032

Figure 3c. Reading Data from a Previously Selected Register

D0

ACK. BY STOP BY

ADM1032 MASTER

ALERT OUTPUT

The ALERT output goes low whenever an out-of-limit mea-

surement is detected, or if the remote temperature sensor is

open-circuit. It is an open drain and requires a pull-up to VDD.

Several ALERT outputs can be wire-ORed together, so that the

common line will go low if one or more of the ALERT outputs

goes low.

The ALERT output can be used as an interrupt signal to a

processor, or it may be used as an SMBALERT. Slave devices

on the SMBus can normally not signal to the master that they

want to talk, but the SMBALERT function allows them to do so.

One or more ALERT outputs can be connected to a common

SMBALERT line connected to the master. When the

SMBALERT line is pulled low by one of the devices, the fol-

lowing procedure occurs as illustrated in Figure 4.

MASTER

RECEIVES

SMBALERT

START

ALERT RESPONSE ADDRESS

RD

ACK

DEVICE ADDRESS

NO

ACK

STOP

MASTER SENDS

ARA AND READ

COMMAND

DEVICE SENDS

ITS ADDRESS

Figure 4. Use of SMBALERT

REV. 0

–9–

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