ADM1032ARM ON Semiconductor, ADM1032ARM Datasheet - Page 8

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ADM1032ARM

Manufacturer Part Number
ADM1032ARM
Description
IC TEMP MONITOR 85DEG C 8MSOP
Manufacturer
ON Semiconductor
Datasheet

Specifications of ADM1032ARM

Rohs Status
RoHS non-compliant
Function
Temp Monitoring System (Sensor)
Topology
ADC, Comparator, Multiplexer, Register Bank
Sensor Type
External & Internal
Sensing Temperature
0°C ~ 100°C, External Sensor
Output Type
SMBus™
Output Alarm
Yes
Output Fan
Yes
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
0°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,

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Temperature Data Format
can measure from 0°C to 127.875°C. The temperature data
format is shown in Table 1 and Table 2.
measurements are stored in the local and remote temperature
value registers and are compared with limits programmed
into the local and remote high and low limit registers.
ADM1032 Registers
results of remote and local temperature measurements and
high and low temperature limits and to configure and control
the device. A description of these registers follows, and
further details are given in Table 3 to Table 7.
Address Pointer Register
require, an address because it is the register the first data byte
of every write operation is written to automatically. This
data byte is an address pointer that sets up one of the other
registers for the second byte of the write operation or for a
subsequent read operation.
is 00h. Therefore, if a read operation is performed
immediately after power−on without first writing to the
address pointer, the value of the local temperature is returned
because its register address is 00h.
Table 1. Temperature Data Format (Local
Temperature and Remote Temperature High Byte
Table 2. Extended Temperature Resolution (Remote
Temperature Low Byte
One LSB of the ADC corresponds to 0.125°C, so the ADC
The results of the local and remote temperature
Extended Resolution
The ADM1032 contains registers that are used to store the
The address pointer register itself does not have, or
The power−on default value of the address pointer register
Temperature
0.000°C
0.125°C
0.250°C
0.375°C
0.500°C
0.625°C
0.750°C
0.875°C
100°C
125°C
127°C
10°C
25°C
50°C
75°C
0°C
1°C
Remote Temperature Low Byte
0 000 0000
0 010 0000
0 100 0000
0 110 0000
1 000 0000
1 010 0000
1 100 0000
1 110 0000
Digital Output
0 000 0000
0 000 0001
0 000 1010
0 001 1001
0 011 0010
0 100 1011
0 110 0100
0 111 1101
0 111 1111
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8
Value Registers
local and remote temperature measurements. These
registers are written to by the ADC only and can be read over
the SMBus.
Offset Register
packages and clock noise can introduce offset errors into the
remote temperature measurement. To achieve the specified
accuracy on this channel, these offsets must be removed.
value in Register 11h (high byte) and Register 12h (low byte,
left justified). The value of the offset is negative if the MSB
of Register 11h is 1 and positive if the MSB of Register 12h
is 0. The value is added to the measured value of the remote
temperature.
and has no effect if nothing is written to them.
Status Register
converting when it is high. Bit 6 to Bit 3, Bit 1, and Bit 0 are
flags that indicate the results of the limit comparisons. Bit 2
is set when the remote sensor is open circuit.
above the corresponding high temperature limit, or below or
equal to the corresponding low temperature limit, one or
more of these flags is set. These five flags (Bit 6 to Bit 2) are
NOR’ed together, so that if any of them are high, the ALERT
interrupt latch is set and the ALERT output goes low.
Reading the status register clears the five flag bits, provided
that the error conditions that caused the flags to be set have
gone away. While a limit comparator is tripped due to a value
register containing an out−of−limit measurement, or the
sensor is open circuit, the corresponding flag bit cannot be
reset. A flag bit can only be reset if the corresponding value
register contains an in−limit measurement or the sensor is
good.
status register but is reset when the ALERT output is
serviced by the master reading the device address, provided
the error condition has gone away and the status register flag
bits are reset.
Table 3. Sample Offset Register Codes
The ADM1032 has three registers to store the results of
Series resistance on the D+ and D− lines in processor
The offset value is stored as an 11−bit, twos complement
The offset register powers up with a default value of 0°C
Bit 7 of the status register indicates that the ADC is busy
If the local and/or remote temperature measurement is
The ALERT interrupt latch is not reset by reading the
Offset Value
−0.125°C
+0.125°C
−4°C
−1°C
+1°C
+4°C
0°C
0 000 0000
0 000 0000
0 000 0001
0 000 0100
1 111 1100
1 111 1111
1 111 1111
11h
0 000 0000
0 000 0000
1 110 0000
0 000 0000
0 010 0000
0 000 0000
0 000 0000
12h

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