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Data Sheet

ADT7320

Rev. 0 | Page 15 of 24

TEMPERATURE VALUE REGISTER

The temperature value register stores the temperature measured

by the internal temperature sensor. The temperature is stored in

a 16-bit, twos complement format. The temperature is read back

from the temperature value register (Register Address 0x02) as a

16-bit value.

Bit 2, Bit 1, and Bit 0 are event alarm flags for TCRIT, THIGH, and

TLOW, respectively. When the ADC is configured to convert the

temperature to a 16-bit digital value, Bit 2, Bit 1, and Bit 0 are

no longer used as flag bits and are, instead, used as the LSB bits for

the extended digital value.

ID REGISTER

This 8-bit read-only register (Register Address 0x03) stores

the manufacturer ID in Bit 7 to Bit 3 and the silicon revision in

Bit 2 to Bit 0. The default setting for the ID register is 0xC3.

TCRIT SETPOINT REGISTER

The 16-bit TCRIT setpoint register (Register Address 0x04) stores

the critical overtemperature limit value. A critical overtemperature

event occurs when the temperature value stored in the temperature

value register exceeds the value stored in this register. The CT

pin is activated if a critical overtemperature event occurs. The

temperature is stored in twos complement format with the MSB

being the temperature sign bit.

The default setting for the TCRIT setpoint is 147°C.

Table 9. Temperature Value Register (Register Address 0x02)

Bit(s)

Default Value

Type

Name

Description

[0]

TLOW flag/LSB0

Flags a TLOW event if the configuration register, Register Address 0x01[7] = 0

(13-bit resolution). When the temperature value is below TLOW, this bit is set to 1.

Contains Least Significant Bit 0 of the 15-bit temperature value when the

configuration register, Register Address 0x01[7] = 1 (16-bit resolution).

[1]

THIGH flag/LSB1

Flags a THIGH event if the configuration register, Register Address 0x01[7] = 0

(13-bit resolution). When the temperature value is above THIGH, this bit is set to 1.

Contains Least Significant Bit 1 of the 15-bit temperature value when the

configuration register, Register Address 0x01[7] = 1 (16-bit resolution).

[2]

TCRIT flag/LSB2

Flags a TCRIT event if the configuration register, Register Address 0x01[7] = 0

(13-bit resolution). When the temperature value exceeds TCRIT, this bit is set to 1.

Contains the Least Significant Bit 2 of the 15-bit temperature value if the

configuration register, Register Address 0x01[7] = 1 (16-bit resolution).

[7:3]

00000

Temp

Temperature value in twos complement format.

[14:8]

0000000

Temp

Temperature value in twos complement format.

Sign

Sign bit; indicates if the temperature value is negative or positive.

Table 10. ID Register (Register Address 0x03)

Bit(s)

Default Value

Type

Name

Description

[2:0]

011

Revision ID

Contains the silicon revision identification number.

[7:3]

11000

Manufacturer ID

Contains the manufacturer identification number.

Table 11. TCRIT Setpoint Register (Register Address 0x04)

Bit(s)

Default Value

Type

Name

Description

[15:0]

0x4980

R/W

TCRIT

16-bit critical overtemperature limit, stored in twos complement format.

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