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ADM1032ARM Datenblatt(PDF) 9 Page - Analog Devices

Teilenummer ADM1032ARM
Bauteilbeschribung  -1C Remote and Local System Temperature Monitor
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REV. 0
ADM1032
–9–
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.
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.
A6
19
1
9
A5
A4
A3
A2
A1
A0
R/
W
D7
D6
D5
D4
D3
D2
D1
D0
SCLK
SDATA
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
STOP BY
MASTER
ACK. BY
ADM1032
ACK. BY
ADM1032
FRAME 3
DATA BYTE
SDATA (CONTINUED)
SCLK (CONTINUED)
ACK. BY
ADM1032
9
1
D7
D6
D5
D4
D3
D2
D1
D0
Figure 3a. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
SCLK
SDATA
START BY
MASTER
19
1
9
A6
A5
A4
A3
A2
A1
A0
R/
W
D7
D6
D5
D4
D3
D2
D1
D0
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
STOP BY
MASTER
ACK. BY
ADM1032
ACK. BY
ADM1032
Figure 3b. Writing to the Address Pointer Register Only
SCLK
19
1
9
SDATA
A6
A5
A4
A3
A2
A1
A0
R/
W
D7
D6
D5
D4
D3
D2
D1
D0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
DATA BYTE FROM ADM1032
STOP BY
MASTER
ACK. BY
ADM1032
ACK. BY
ADM1032
Figure 3c. Reading Data from a Previously Selected 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.
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
MASTER SENDS
ARA AND READ
COMMAND
DEVICE SENDS
ITS ADDRESS
NO
ACK
START
ALERT RESPONSE ADDRESS
RD
ACK
DEVICE ADDRESS
STOP
Figure 4. Use of
SMBALERT


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