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ADM1032 Datasheet(PDF) 12 Page - ON Semiconductor

Part No. ADM1032
Description  1C Remote and Local System Temperature Monitor
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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ADM1032 Datasheet(HTML) 12 Page - ON Semiconductor

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ADM1032
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12
Figure 13. Writing a Register Address to the Address Pointer Register,
then Writing Data to the Selected Register
R/W
A6
SCLK
SDATA
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1032
START BY
MASTER
19
1
ACK. BY
ADM1032
9
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1032
STOP BY
MASTER
1
9
SCLK (CONTINUED)
SDATA (CONTINUED)
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
FRAME 3
DATA BYTE
Figure 14. Writing to the Address Pointer Register Only
SCLK
SDATA
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1032
START BY
MASTER
19
1
ACK. BY
ADM1032
9
STOP BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
R/W
A2
A3
A4
A5
A6
Figure 15. Reading Data from a Previously Selected Register
SCLK
SDATA
D7
D6
D5
D4
D3
D2
D1
D0
START BY
MASTER
9
1
ACK. BY
ADM1032
9
STOP BY
MASTER
A1
A0
1
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
DATA BYTE FROM ADM1032
R/W
A2
A3
A4
A5
A6
ACK. BY
ADM1032
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).
Figure 16. Use of SMBALERT
ALERT RESPONSE
ADDRESS
MASTER SENDS
ARA AND READ
COMMAND
DEVICE SENDS
ITS ADDRESS
RD
START
ACK
DEVICE
ADDRESS
NO
ACK STOP
MASTER
RECEIVES
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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