ADT7461 datasheet(11/24 Pages) AD

Part #	ADT7461

Description	짹1째C Temperature Monitor with Series Resistance Cancellation

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ADT7461

Table 6. Temperature Data Format (Local and Remote Temperature High Byte)

Temperature

Binary

Offset Binary1

–55°C

0 000 00002

0 000 1001

0°C

0 000 0000

0 100 0000

+1°C

0 000 0001

0 100 0001

+10°C

0 000 1010

0 100 1010

+25°C

0 001 1001

0 101 1001

+50°C

0 011 0010

0 111 0010

+75°C

0 100 1011

1 000 1011

+100°C

0 110 0100

1 010 0100

+125°C

0 111 1101

1 011 1101

+127°C

0 111 1111

1 011 1111

+150°C

0 111 11113

1 101 0110

1 Offset binary scale temperature values are offset by +64.

2 Binary scale temperature measurement returns 0 for all temperatures < 0°C.

3 Binary scale temperature measurement returns 127 for all temperature > 127°C.

The user may switch between measurement ranges at any time.

Switching the range will also switch the data format. The next

temperature result following the switching will be reported back

to the register in the new format. However, the contents of the

limit registers will not change. It is up to the user to ensure that

when the data format changes, the limit registers are repro-

grammed as necessary. More information on this can be found

in the

section.

Limit Registers

ADT7461 REGISTERS

The ADT7461 contains 22 8-bit registers in total. These regis-

ters are used to store the results of remote and local temperature

measurements and high and low temperature limits and to con-

figure and control the device. A description of these registers

follows, and further details are given in Table 7 through Table 11.

Address Pointer Register

The address pointer register itself does not have, or require, an

address, as the first byte of every write operation is automati-

cally written to this register. The data in this first byte always

contains the address of another register on the ADT7461, which

is stored in the address pointer register. It is to this register

address that the second byte of a write operation is written to or

to which a subsequent read operation is performed.

The power-on default value of the address pointer register is

0×00, so if a read operation is performed immediately after

power-on, without first writing to the address pointer, the value

of the local temperature will be returned, since its register

address is 0×00.

Temperature Value Registers

The ADT7461 has three registers to store the results of local and

remote temperature measurements. These registers can only be

written to by the ADC and can be read by the user over the

SMBus. The local temperature value register is at Address 0×00.

The external temperature value high byte register is at Address

0×01, with the low byte register at Address 0×10. The power-on

default for all three registers is 0×00.

Configuration Register

The configuration register is Address 0×03 at read and Address

0×09 at write. Its power-on default is 0×00. Only four bits of the

configuration register are used. Bits 0, 1, 3, and 4 are reserved

and should not be written to by the user.

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

output. If Bit 7 is 0, the ALERT output is enabled. This is the

power-on default. If Bit 7 is set to 1, the ALERT output is dis-

abled. This only applies if Pin 6 is configured as ALERT. If Pin 6

is configured as THERM2, then the value of Bit 7 has no effect.

If Bit 6 is 0, 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. The SMBus does,

however, remain active in standby mode, so values can be read

from or written to the ADT7461 via the SMBus in this mode.

The ALERT and THERM outputs are also active in standby

mode. Changes made to the registers in standby mode that

affect the THERM or ALERT outputs will cause these signals to

be updated.

Bit 5 determines the configuration of Pin 6 on the ADT7461. If

Bit 5 is 0, (default) then Pin 6 is configured as an ALERT output.

If Bit 5 is 1, then Pin 6 is configured as a THERM2 output. Bit 7,

the ALERT mask bit, is only active when Pin 6 is configured as

an ALERT output. If Pin 6 is setup as a THERM2 output, then

Bit 7 has no effect.

Bit 2 sets the temperature measurement range. If Bit 2 is 0

(default value), the temperature measurement range is set

between 0°C to +127°C. Setting Bit 2 to 1 means that the meas-

urement range is set to the extended temperature range.

Rev. 0 | Page 11 of 24

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