Datasheet

STLM75 Functional description
Doc ID 13296 Rev 12 17/40
3.1.2 Configuration register
The configuration register is used to store the device settings such as device operation
mode, OS
operation mode, OS polarity, and OS 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
STLM75 Reserved 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'. Reserved.
1. Indicates operation mode; 0 = comparator mode, and 1 = interrupt mode (see Comparator mode and Interrupt mode on
page 13).
2. The OS
is active-low ('0').