ADM1032ARMZ-001 查看數據表（PDF） - ON Semiconductor

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ADM1032ARMZ-001

±1°C Remote and Local System Temperature Monitor

ON Semiconductor 

ADM1032

Temperature Data Format

One LSB of the ADC corresponds to 0.125°C, so the ADC

can measure from 0°C to 127.875°C. The temperature data

format is shown in Table 1 and Table 2.

The results of the local and remote temperature

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.

Table 1. Temperature Data Format (Local

Temperature and Remote Temperature High Byte

Temperature

Digital Output

0°C

1°C

10°C

25°C

50°C

75°C

100°C

125°C

127°C

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

Table 2. Extended Temperature Resolution (Remote

Temperature Low Byte

Extended Resolution Remote Temperature Low Byte

0.000°C

0.125°C

0.250°C

0.375°C

0.500°C

0.625°C

0.750°C

0.875°C

0 000 0000

0 010 0000

0 100 0000

0 110 0000

1 000 0000

1 010 0000

1 100 0000

1 110 0000

ADM1032 Registers

The ADM1032 contains registers that are used to store the

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

The address pointer register itself does not have, or

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.

The power−on default value of the address pointer register

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.

Value Registers

The ADM1032 has three registers to store the results of

local and remote temperature measurements. These

registers are written to by the ADC only and can be read over

the SMBus.

Offset Register

Series resistance on the D+ and D− lines in processor

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.

The offset value is stored as an 11−bit, twos complement

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.

The offset register powers up with a default value of 0°C

and has no effect if nothing is written to them.

Table 3. Sample Offset Register Codes

Offset Value

11h

12h

−4°C

−1°C

−0.125°C

0°C

+0.125°C

+1°C

+4°C

1 111 1100

1 111 1111

1 111 1111

0 000 0000

0 000 0000

0 000 0001

0 000 0100

0 000 0000

0 000 0000

1 110 0000

0 000 0000

0 010 0000

0 000 0000

0 000 0000

Status Register

Bit 7 of the status register indicates that the ADC is busy

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.

If the local and/or remote temperature measurement is

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.

The ALERT interrupt latch is not reset by reading the

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.

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