Datasheet

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 T
CRIT
, T
HIGH
, and
T
LOW
, 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.
T
CRIT
SETPOINT REGISTER
The 16-bit T
CRIT
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 T
CRIT
setpoint is 147°C.
Table 9. Temperature Value Register (Register Address 0x02)
Bit(s) Default Value Type Name Description
[0] 0 R T
LOW
flag/LSB0 Flags a T
LOW
event if the configuration register, Register Address 0x01[7] = 0
(13-bit resolution). When the temperature value is below T
LOW
, 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] 0 R T
HIGH
flag/LSB1 Flags a T
HIGH
event if the configuration register, Register Address 0x01[7] = 0
(13-bit resolution). When the temperature value is above T
HIGH
, 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] 0 R T
CRIT
flag/LSB2 Flags a T
CRIT
event if the configuration register, Register Address 0x01[7] = 0
(13-bit resolution). When the temperature value exceeds T
CRIT
, 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 R Temp Temperature value in twos complement format.
[14:8] 0000000 R Temp Temperature value in twos complement format.
15 0 R 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 R Revision ID Contains the silicon revision identification number.
[7:3]
11000
R
Manufacturer ID
Contains the manufacturer identification number.
Table 11. T
CRIT
Setpoint Register (Register Address 0x04)
Bit(s) Default Value Type Name Description
[15:0] 0x4980 R/
W
T
CRIT
16-bit critical overtemperature limit, stored in twos complement format.