ADM1023ARQZ-REEL 데이터 시트보기 (PDF) - ON Semiconductor

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ADM1023ARQZ-REEL

ACPI-Compliant, High Accuracy Microprocessor System Temperature Monitor

ON Semiconductor 

ADM1023

Temperature Data Format

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

ADM1023 can measure from 0°C to 127.875°C. The

temperature data format and extended temperature

resolution are shown in Table 1 and Table 2.

Table 1. Temperature Data Format

(Local and Remote Temperature High Byte)

Temperature (5C) (Note 1)

Digital Output

0

0 000 0000

1

0 000 0001

10

0 000 1010

25

0 001 1001

50

0 011 0010

75

0 100 1011

100

0 110 0100

125

0 111 1101

127

0 111 1111

1. The ADM1023 differs from the ADM1021 in that the

temperature resolution of the remote channel is improved

from 1°C to 0.125°C, but it cannot measure temperatures

below 0°C. If negative temperature measurement is required,

the ADM1021 should be used.

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 2. Extended Temperature Resolution

(Remote Temperature Low Byte)

Extended Resolution (5C)

Temperature Low Bits

0.000

0.125

0.250

0.375

0.500

0.625

0.750

0.875

0000 0000

0010 0000

0100 0000

0110 0000

1000 0000

1010 0000

1100 0000

1110 0000

Register Functions

The ADM1023 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. Most of

the registers for the ADM1023 are dual−port and have

different addresses for read and write operations.

Attempting to write to a read address or to read from a write

address produces an invalid result. Register addresses above

0x14 are reserved for future use or factory test purposes and

should not be written to.

Address Pointer Register

The address pointer register does not have, nor does it

require, an address, because it is the register to which the

first data byte of every write operation is automatically

written. 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.

Value Registers

The ADM1023 has three registers to store the results of

local and remote temperature measurements. These

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

the SMBus.

The Offset Register

Two offset registers are provided at Address 0x11 and

Address 0x12. These are provided so that the user may

remove errors from the measured values of remote

temperature. These errors may be introduced by clock noise

and PCB track resistance. See Table 4 for an example of

offset values.

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

value in Register 0x11 (high byte) and Register 0x12 (low

byte, left justified). The value of the offset is negative if the

MSB of Register 0x11 is 1, and it is positive if the MSB of

Register 0x11 is 0. This value is added to the remote

temperature. These registers default to 0 at powerup and

have no effect if nothing is written to them. The offset

register can accept values from −128.875°C to +127.875°C.

The ADM1023 detects overflow so the remote temperature

value register does not wrap around +127°C or −128°C.

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