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ADM1032 Datasheet(PDF) 10 Page - ON Semiconductor

Part No. ADM1032
Description  ±1℃ 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) 10 Page - ON Semiconductor

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ADM1032
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Table 7. Consecutive ALERT Register Codes
Register Value
Number of Out−of−Limit
Measurements Required
yxxx 000x
1
yxxx 001x
2
yxxx 011x
3
yxxx 111x
4
NOTE: x = don’t care bits, and y = SMBus timeout bit.
Default = 0. See SMBus section for more information.
Serial Bus Interface
Control of the ADM1032 is carried out via the serial bus.
The ADM1032 is connected to this bus as a slave device,
under the control of a master device.
There is a programmable SMBus timeout. When this is
enabled, the SMBus times out after typically 25 ms of no
activity. However, this feature is not enabled by default. To
enable it, set Bit 7 of the consecutive alert register
(Address = 22h).
Table 8. List of ADM1032 Registers
Read Address (Hex)
Write Address (Hex)
Name
Power−On Default
Not Applicable
Not Applicable
Address Pointer
Undefined
00
Not Applicable
Local Temperature Value
0000 0000 (00h)
01
Not Applicable
External Temperature Value High Byte
0000 0000 (00h)
02
Not Applicable
Status
Undefined
03
09
Configuration
0000 0000 (00h)
04
0A
Conversion Rate
0000 1000 (08h)
05
0B
Local Temperature High Limit
0101 0101 (55h) (85°C)
06
0C
Local Temperature Low Limit
0000 0000 (00h) (0°C)
07
0D
External Temperature High Limit High Byte
0101 0101 (55h) (85°C)
08
0E
External Temperature Low Limit High Byte
0000 0000 (00h) (0°C)
Not Applicable
0F
One−Shot
10
Not Applicable
External Temperature Value Low Byte
0000 0000
11
11
External Temperature Offset High Byte
0000 0000
12
12
External Temperature Offset Low Byte
0000 0000
13
13
External Temperature High Limit Low Byte
0000 0000
14
14
External Temperature Low Limit Low Byte
0000 0000
19
19
External THERM Limit
0101 0101 (55h) (85°C) (ADM1032)
0110 1100 (6Ch) (108°C)
(ADM1032−1)
20
20
Local THERM Limit
0101 0101 (55h) (85°C)
21
21
THERM Hysteresis
0000 1010 (0Ah) (10°C)
22
22
Consecutive ALERT
0000 0001 (01h)
FE
Not Applicable
Manufacturer ID
0100 0001 (41h)
FF
Not Applicable
Die Revision Code
Undefined
NOTE: 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.
Addressing the Device
In general, every SMBus device has a 7−bit device address
(except for some devices that have extended, 10−bit
addresses). When the master device sends a device address
over the bus, the slave device with that address responds.
The ADM1032 and the ADM1032−1 are available with one
SMBus address, which is Hex 4C (1001 100). The
ADM1032−2 is also available with one SMBus address;
however, that address is Hex 4D (1001 101).
The serial bus protocol operates as follows:
1. The master initiates data transfer by establishing a
START condition, defined as a high−to−low
transition on the serial data line SDATA, while the
serial clock line SCLK remains high. This
indicates that an address/data stream follows. All
slave peripherals connected to the serial bus
respond to the START condition and shift in the
next eight bits, consisting of a 7−bit address (MSB
first) plus an R/W bit, which determines the


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