Datasheet

Functional description STCN75
16/36 Doc ID 13307 Rev 9
3.1.2 Configuration register
The configuration register is used to store the device settings such as device operation
mode, OS
/INT operation mode, OS/INT polarity, and OS/INT fault queue.
The configuration register allows the user to program various options such as thermostat
fault tolerance, thermostat polarity, thermostat operating mode, and shutdown mode. The
user has READ/WRITE access to all of the bits in the configuration register except the MSB
(Bit7), which is reserved as a “Read only” bit (see Ta bl e 6 ). The entire register is volatile and
thus powers-up in its default state only.
Table 5. 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 4B00 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
Table 6. Configuration register format
Byte
MSB LSB
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
STCN75 0 0 0 FT1 FT0 POL M SD
Default00000000
Keys: SD = shutdown control bit FT1 = fault tolerance1 bit
M = thermostat mode
(1)
Bit 5 = must be set to '0'.
POL = output polarity
(2)
Bit 6 = must be set to '0'.
FT0 = fault tolerance0 bit Bit 7 = must be set to '0'.
1. Indicates operation mode; 0 = comparator mode, and 1 = interrupt mode (see Section 2.3: Comparator mode and
Section 2.4: Interrupt mode).
2. The OS
is active-low ('0').