Datasheet

Data Sheet ADT75
Rev. B | Page 13 of 24
REGISTERS
The ADT75 contains six registers: four are data registers, one is
the address pointer register, and the final register is the one-shot
register. The configuration register is the only data register that
is 8 bits wide while the rest are 16 bits wide. The temperature
value register is the only data register that is read only. Both a read
and write can be performed on the rest of the data registers and
on the one-shot register. On power-up, the address pointer register
is loaded with 0x00 and points to the temperature value register.
Table 7. ADT75 Registers
Pointer Address Name Power-On Default
0x00
Temperature value
0x00
0x01 Configuration 0x00
0x02 T
HYST
setpoint 0x4B00 (75°C)
0x03 T
OS
setpoint 0x5000 (80°C)
0x04 One-shot 0xXX
Address Pointer Register
This 8-bit write only register stores an address that points to one
of the four data registers and selects the one-shot mode. P0 and
P1 select the data register to which subsequent data bytes are
written to or read from. P0, P1, and P2 are used to select the
one-shot mode by writing 04h to this register. A zero should be
written to the rest of the bits.
Table 8. Address Pointer Register
P7 P6 P5 P4 P3 P2 P1 P0
Default Settings at
Power-Up
0 0 0 0 0 0 0 0
Table 9. Register Addresses
P2
P1
P0
Register Selected
0 0 0 Temperature value
0 0 1 Configuration
0 1 0 T
HYST
setpoint
0 1 1 T
OS
setpoint
1 0 0 One-shot mode