Datasheet

ADT7320 Data Sheet
Rev. 0 | Page 16 of 24
T
HYST
SETPOINT REGISTER
The 8-bit T
HYST
setpoint register (Register Address 0x05) stores
the temperature hysteresis value for the T
HIGH
, T
LOW
, and T
CRIT
temperature limits. The temperature hysteresis value is stored in
straight binary format using the four LSBs. Increments are possible
in steps of 1°C from 0°C to 15°C. The value in this register is
subtracted from the T
HIGH
and T
CRIT
values and added to the
T
LOW
value to implement hysteresis.
The default setting for the T
HYST
setpoint is 5°C.
T
HIGH
SETPOINT REGISTER
The 16-bit T
HIGH
setpoint register (Register Address 0x06) stores
the overtemperature limit value. An overtemperature event occurs
when the temperature value stored in the temperature value
register exceeds the value stored in this register. The INT pin is
activated if an overtemperature event occurs. The temperature
is stored in twos complement format with the most significant
bit being the temperature sign bit.
The default setting for the T
HIGH
setpoint is 64°C.
T
LOW
SETPOINT REGISTER
The 16-bit T
LOW
setpoint register (Register Address 0x07) stores
the undertemperature limit value. An undertemperature event
occurs when the temperature value stored in the temperature
value register is less than the value stored in this register. The
INT pin is activated if an undertemperature event occurs. The
temperature is stored in twos complement format with the MSB
being the temperature sign bit.
The default setting for the T
LOW
setpoint is 10°C.
Table 12. T
HYST
Setpoint Register (Register Address 0x05)
Bit(s) Default Value Type Name Description
[3:0]
0101
R/W
T
HYST
Hysteresis value, from 0°C to 15°C. Stored in straight binary format. The default setting is 5°C.
[7:4]
0000
R/W
N/A N/A = not applicable. Not used.
Table 13. T
HIGH
Setpoint Register (Register Address 0x06)
Bit(s) Default Value Type Name Description
[15:0] 0x2000
R/W
T
HIGH
16-bit overtemperature limit, stored in twos complement format.
Table 14. T
LOW
Setpoint Register (Register Address 0x07)
Bit(s) Default Value Type Name Description
[15:0] 0x0500
R/W
T
LOW
16-bit undertemperature limit, stored in twos complement format.