ADM1032
Table VIII. List of ADM1032 Registers
Read Address (Hex)
Write Address (Hex)
Name
Power-On Default
Not Applicable
00
01
02
Not Applicable
Not Applicable
Not Applicable
Not Applicable
Address Pointer
Undefined
Local Temperature Value
External Temperature Value High Byte
Status
0000 0000 (00h)
0000 0000 (00h)
Undefined
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
Configuration
Conversion Rate
Local Temperature High Limit
Local Temperature Low Limit
External Temperature High Limit High Byte
External Temperature Low Limit High Byte
One-Shot
0000 0000 (00h)
0000 1000 (08h)
0101 0101 (55h) (85°C)
0000 0000 (00h) (0°C)
0101 0101 (55h) (85°C)
0000 0000 (00h) (0°C)
Not Applicable
10
11
12
13
14
19
20
21
22
FE
FF
Not Applicable
11
12
13
14
19
20
21
External Temperature Value Low Byte
External Temperature Offset High Byte
External Temperature Offset Low Byte
External Temperature High Limit Low Byte
External Temperature Low Limit Low Byte
External THERM Limit
Local THERM Limit
THERM Hysteresis
Consecutive ALERT
Manufacturer ID
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0101 0101 (55h) (85°C)
0101 0101 (55h) (85°C)
0000 1010 (0Ah) (10°C)
0000 0001 (01h)
0100 0001 (41h)
Undefined
22
Not Applicable
Not Applicable
Die Revision Code
Writing to address 0F causes the ADM1032 to perform a single measurement. It is not a data register as such and it does not matter what data is written to it.
to it. If the R/W bit is a 0, the master will write to the slave
device. If the R/W bit is a 1, the master will read from the
slave device.
To write data to one of the device data registers or read data
from it, the Address Pointer Register must be set so that the
correct data register is addressed, then data can be written into
that register or read from it. The first byte of a write operation
always contains a valid address that is stored in the Address
Pointer Register. If data is to be written to the device, the write
operation contains a second data byte that is written to the
register selected by the address pointer register.
2. Data is sent over the serial bus in sequences of nine clock
pulses, eight bits of data followed by an Acknowledge Bit
from the slave device. Transitions on the data line must
occur during the low period of the clock signal and remain
stable during the high period, as a low-to-high transition
when the clock is high may be interpreted as a STOP signal.
The number of data bytes that can be transmitted over the
serial bus in a single Read or Write operation is limited only
by what the master and slave devices can handle.
This is illustrated in Figure 3a. The device address is sent over
the bus followed by R/W set to 0. This is followed by two data
bytes. The first data byte is the address of the internal data
register to be written to, which is stored in the Address Pointer
Register. The second data byte is the data to be written to the
internal data register.
3. When all data bytes have been read or written, stop condi-
tions are established. In Write mode, the master will pull the
data line high during the tenth clock pulse to assert a STOP
condition. In Read mode, the master device will override the
acknowledge bit by pulling the data line high during the low
period before the ninth clock pulse. This is known as No
Acknowledge. The master will then take the data line low
during the low period before the tenth clock pulse, then high
during the tenth clock pulse to assert a STOP condition.
When reading data from a register there are two possibilities:
1. If the ADM1032’s Address Pointer Register value is unknown
or not the desired value, it is first necessary to set it to the
correct value before data can be read from the desired data
register. This is done by performing a write to the ADM1032
as before, but only the data byte containing the register read
address is sent, as data is not to be written to the register.
This is shown in Figure 3b.
Any number of bytes of data may be transferred over the serial
bus in one operation, but it is not possible to mix read and write
in one operation because the type of operation is determined at
the beginning and cannot subsequently be changed without
starting a new operation.
A read operation is then performed consisting of the serial bus
address, R/W bit set to 1, followed by the data byte read from
the data register. This is shown in Figure 3c.
2. If the Address Pointer Register is known to be already at the
desired address, data can be read from the corresponding
data register without first writing to the Address Pointer
Register and Figure 3b can be omitted.
In the case of the ADM1032, write operations contain either one
or two bytes, while read operations contain one byte, and per-
form the following functions:
–8–
REV. 0
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