ADM1023

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10

Table 3. List of ADM1023 Registers

Read Address (Hex)

Write Address (Hex)

Name

Power−On Default

Not applicable

Not applicable

Address pointer

Undefined

00

Not applicable

Local temperature value

1000 0000 (0x80) (−128

°C)

01

Not applicable

Remote temperature value high byte

1000 0000 (0x80) (−128

°C)

02

Not applicable

Status

Undefined

03

09

Configuration

0000 0000 (0x00)

04

0A

Conversion rate

0000 0010 (0x02)

05

0B

Local temperature high limit

0111 1111 (0x7F) (+127

°C)

06

0C

Local temperature low limit

1100 1001 (0xC9) (−55

°C)

07

0D

Remote temperature high limit high byte

0111 1111 (0x7F) (+127

°C)

08

0E

Remote temperature low limit high byte

1100 1001 (0xC9) (−55

°C)

Not applicable

0F (Note 1)

One−shot

10

Not applicable

Remote temperature value low byte

0000 0000

11

11

Remote temperature offset high byte

0000 0000

12

12

Remote temperature offset low byte

0000 0000

13

13

Remote temperature high limit low byte

0000 0000

14

14

Remote temperature low limit low byte

0000 0000

19

Not applicable

Reserved

0000 0000

20

21

Reserved

Undefined

FE

Not applicable

Manufacturer device ID

0100 0001 (0x41)

FF

Not applicable

Die revision code

0011 xxxx (0x3x)

1. Writing to Address 0F causes the ADM1023 to perform a single measurement. It is not a data register as such; thus, it does not matter what

data is written to it.

Table 4. Offset Values

Offset Registers

Remote Temperature

0x11

0x12

Offset Value

With Offset

Without 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 (see Table 5) indicates that the

ADC is busy converting when it is high. Bit 6 to Bit 3 are

flags indicating the results of the limit comparisons.

If the local and/or remote temperature measurement is

above the corresponding high temperature limit or below the

corresponding 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 is set, and the ALERT output goes low.

Reading the status register clears 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 be reset only 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 it resets 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.