ADM1032 データシートの表示（PDF） - ON Semiconductor

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ADM1032

±1°C Remote and Local System Temperature Monitor

ON Semiconductor 

ADM1032

1

91

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 13. 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 14. Writing to the Address Pointer Register Only

19

SCLK

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 15. 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

measurement is detected, or if the remote temperature sensor

is open−circuit. It is an open drain and requires a pullup to

VDD. Several ALERT outputs can be wire−OR’ed together

so that the common line goes 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 can be used as an SMBALERT. Slave devices

on the SMBus can not normally 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

following procedure occurs (see Figure 16).

MASTER

RECEIVES

SMBALERT

START

ALERT RESPONSE

ADDRESS

MASTER SENDS

ARA AND READ

COMMAND

RD ACK

DEVICE

ADDRESS

NO

ACK

STOP

DEVICE SENDS

ITS ADDRESS

Figure 16. Use of SMBALERT

1. SMBALERT is pulled low.

2. Master initiates a read operation and sends the

alert response address (ARA = 0001 100). This is

a general call address that must not be used as a

specific device address.

3. The device whose ALERT output is low responds

to the alert response address and the master reads

its device address. Since the device address is

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