Datasheet

STTS75 Functional description
Doc ID 13298 Rev 11 17/41
3 Functional description
The STTS75 registers have unique pointer designations which are defined in Ta bl e 6 o n
page 17. Whenever any READ/WRITE operation to the STTS75 register is desired, the user
must “point” to the device register to be accessed.
All of these user-accessible registers can be accessed via the digital serial interface at
anytime (see Serial interface on page 21), and they include:
● Command register/address pointer register
● Configuration register
● Temperature register
● Overlimit signal temperature register (T
OS
)
● Hysteresis temperature register (T
HYS
)
3.1 Registers and register set formats
3.1.1 Command/pointer register
The most significant bits (MSBs) of the command register must always be zero. Writing a '1'
into any of these bits will cause the current operation to be terminated (see Tab le 5).
The command register retains pointer information between operations. Therefore, this
register only needs to be updated once for consecutive READ operations from the same
register. All bits in the command register default to '0' at power-up.
Table 5. Command/pointer register format
MSB LSB
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
000000P1P0
Pointer
Table 6. Register pointers selection summary
Pointer
value
(H)
P1 P0 Name Description
Width
(bits)
Type
(R/W)
Power-on
default
Comments
00 0 0 TEMP
Temperature
register
16
Read
only
N/A To store measured temperature data
01 0 1 CONF
Configuration
register
8R/W 00
02 1 0 T
HYS
Hysteresis
register
16 R/W 4800 Default = 75 °C
03 1 1 T
OS
Overtemperature
shutdown
16 R/W 5000
Set point for overtemperature
shutdown (T
OS
) limit default = 80 °C