ADM1023ARQ View Datasheet(PDF) - Analog Devices

Part Name

Description

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ADM1023ARQ

ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor

Analog Devices 

ADM1023

Table III. List of ADM1023 Registers

READ Address (Hex) WRITE Address (Hex) Name

Power-On Default

Not Applicable

00

01

02

03

04

05

06

07

08

Not Applicable

10

11

12

13

14

19

20

FE

FF

Not Applicable

Not Applicable

Not Applicable

Not Applicable

09

0A

0B

0C

0D

0E

0F1

Not Applicable

11

12

13

14

Not Applicable

21

Not Applicable

Not Applicable

Address Pointer

Local Temperature Value

Remote Temperature Value High Byte

Status

Configuration

Conversion Rate

Local Temperature High Limit

Local Temperature Low Limit

Remote Temperature High Limit High Byte

Remote Temperature Low Limit High Byte

One-Shot

Remote Temperature Value Low Byte

Remote Temperature Offset High Byte

Remote Temperature Offset Low Byte

Remote Temperature High Limit Low Byte

Remote Temperature Low Limit Low Byte

Reserved

Reserved

Manufacturer Device ID

Die Revision Code

Undefined

1000 0000 (80h) (–128°C)

1000 0000 (80h) (–128°C)

Undefined

0000 0000 (00h)

0000 0010 (02h)

0111 1111 (7Fh) (+127°C)

1100 1001 (C9h) (–55°C)

0111 1111 (7Fh) (+127°C)

1100 1001 (C9h) (–55°C)

0000 0000

0000 0000

0000 0000

0000 0000

0000 0000

0000 0000

Undefined

0100 0001 (41h)

0011 xxxx (3xh)

NOTE

1Writing to address 0F causes the ADM1023 to perform a single measurement. It is not a data register as such and it does not matter what data is written to it.

Table IV.

Offset Registers

11h

12h

Offset

Value

Remote

Remote

Temperature Temperature

(Including (Without

Offset)

Offset)

1111 1100 0000 0000 –4°C

14°C

18°C

1111 1111 0000 0000 –1°C

17°C

18°C

1111 1111 1110 0000 –0.125°C 17.875°C

18°C

0000 0000 0000 0000 0°C

18°C

18°C

0000 0000 0010 0000 +0.125°C 18.125°C

18°C

0000 0001 0000 0000 +1°C 19°C

18°C

0000 0100 0000 0000 +4°C 22°C

18°C

Status Register

Bit 7 of the Status Register indicates that the ADC is busy con-

verting when it is high. Bits 6 to 3 are flags that indicate the

results of the limit comparisons.

If the local and/or remote temperature measurement is above

the corresponding high temperature limit, or below the corre-

sponding low temperature limit, one or more of these flags will be

set. Bit 2 is a flag that is set if the remote temperature sensor

is open-circuit. These five flags are NOR’d together, so that if

any of them are high, the ALERT interrupt latch will be set and

the ALERT output will go low. Reading the Status Register will

clear the five flag bits, provided 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 corre-

sponding 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 will be reset when the ALERT output has been

serviced by the master reading the device address, provided the

error condition has gone away and the Status Register flag bits

have been reset.

Table V. Status Register Bit Assignments

Bit Name

Function

7 BUSY

1 When ADC Converting.

6 LHIGH* 1 When Local High Temp Limit Tripped.

5 LLOW* 1 When Local Low Temp Limit Tripped.

4 RHIGH* 1 When Remote High Temp Limit Tripped.

3 RLOW* 1 When Remote Low Temp Limit Tripped.

2 OPEN* 1 When Remote Sensor Open-Circuit.

1–0

Reserved.

*These flags stay high until the status register is read or they are reset by POR.

Configuration Register

Two bits of the configuration register are used. If Bit 6 is 0, which

is the power-on default, the device is in operating mode with the

ADC converting. If Bit 6 is set to 1, the device is in standby mode

and the ADC does not convert. Standby mode can also be selected

by taking the STBY pin low. In standby mode the values of remote

and local temperature remain at the value they were before the

part was placed in standby.

Bit 7 of the configuration register is used to mask the ALERT

output. If Bit 7 is 0, which is the power-on default, the ALERT

output is enabled. If Bit 7 is set to 1, the ALERT output is

disabled.

–8–

REV. A

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