Datasheet
Data Sheet ADT7410
Rev. A | Page 13 of 24
REGISTERS
The ADT7410 contains 14 registers:
• Nine temperature registers
• A status register
• An ID register
• A configuration register
• An address pointer register
• A software reset
All registers are eight bits wide. The temperature value registers,
the status register, and the ID register are read-only. The software
reset is a write-only register. On power-up, the address pointer
register is loaded with 0x00 and points to the temperature value
register MSB.
Table 6. ADT7410 Registers
Register
Address Description
Power-On
Default
0x00 Temperature value most significant byte 0x00
0x01 Temperature value least significant byte 0x00
0x02 Status 0x00
0x03 Configuration 0x00
0x04
T
HIGH
setpoint most significant byte
0x20 (64°C)
0x05 T
HIGH
setpoint least significant byte 0x00 (64°C)
0x06 T
LOW
setpoint most significant byte 0x05 (10°C)
0x07 T
LOW
setpoint least significant byte 0x00 (10°C)
0x08 T
CRIT
setpoint most significant byte 0x49 (147°C)
0x09 T
CRIT
setpoint least significant byte 0x80 (147°C)
0x0A T
HYST
setpoint 0x05 (5°C)
0x0B ID 0xCX
0x2F Software reset 0xXX
ADDRESS POINTER REGISTER
This register is always the first register written to during a write
to the ADT7410. It should be set to the address of the register
to which the write or read transaction is intended. Table 7
shows the register address of each register on the ADT7410.
The default value of the address pointer register is 0x00.
Table 7. Address Pointer Register
P7 P6 P5 P4 P3 P2 P1 P0
ADD7 ADD6 ADD5 ADD4 ADD3 ADD2 ADD1 ADD0
TEMPERATURE VALUE REGISTERS
The temperature value most significant byte (MSB) and tem-
perature value least significant byte (LSB) registers store the
temperature measured by the internal temperature sensor.
The temperature is stored in twos complement format with
the MSB being the temperature sign bit. When reading from
these registers, the eight MSBs (Bit 7 to Bit 15) are read first
from Register Address 0x00 and then the eight LSBs (Bit 0 to
Bit 7) are read from Register Address 0x01. Only the tempera-
ture value most significant byte (Register Address 0x00) needs to
be loaded into the address pointer register as the address pointer
auto-increments to the Temperature value least significant byte
address (Register Address 0x01).
Bit 0 to Bit 2 are event alarm flags for T
CRIT
, T
HIGH
, and T
LOW
. When
the ADC is configured to convert the temperature to a 16-bit
digital value then Bit 0 to Bit 2 are no longer used as flag bits
and are instead used as the LSB bits for the extended digital value.
Table 8. Temperature Value MSB Register (Register Address 0x00)
Bit Default Value Type Name Description
[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 9. Temperature Value LSB Register (Register Address 0x01)
Bit
Default
Value Type Name Description
0 0 R T
LOW
flag/LSB0 Flags a T
LOW
event if the configuration register, Register Address 0x03[7] = 0 (13-bit
resolution). When the temperature value is below T
LOW
, this bit it set to 1.
Contains the Least Significant Bit 0 of the 15-bit temperature value if the configuration
register, Register Address 0x03[7] = 1 (16-bit resolution).
1 0 R T
HIGH
flag/LSB1 Flags a T
HIGH
event if the configuration register, Register Address 0x03[7] = 0 (13-bit
resolution). When the temperature value is above T
HIGH
, this bit it set to 1.
Contains the Least Significant Bit 1 of the 15-bit temperature value if the configuration
register, Register Address 0x03[7] = 1 (16-bit resolution).
2 0 R T
CRIT
flag/LSB2 Flags a T
CRIT
event if the configuration register, Register Address 0x03[7] = 0 (13-bit
resolution). When the temperature value exceeds T
CRIT
, this bit it set to 1.
Contains the Least Significant Bit 2 of the 15-bit temperature value if the configuration
register, Register Address 0x03[7] = 1 (16-bit resolution).
[7:3] 00000 R Temp Temperature value in twos complement format.