Datasheet

Functional description STTS75
18/41 Doc ID 13298 Rev 11
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 conversion
resolution (see Ta bl e 8), 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. The entire register is volatile and thus powers up in its default state
only.
Table 7. Configuration register format
Byte
MSB LSB
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
STTS75 OSM RC1 RC0 FT1 FT0 POL M SD
Default00000000
Keys: SD = shutdown control bit FT1 = fault tolerance1 bit
M = thermostat mode
(1)
1. Indicates operation mode; 0 = comparator mode, and 1 = interrupt mode (see Comparator mode and
Interrupt mode on page 13).
RC0 = resolution conversion0 bit
POL = output polarity
(2)
2. The OS/INT is active-low ('0').
RC1 = resolution conversion1 bit
FT0 = fault tolerance0 bit OSM = one-shot mode bit
Table 8. Programmable resolution configurations
RC1 RC0 Resolution
Conversion time
(max)
Remarks
0 0 9-bit 0.5 °C 85 ms Default resolution
0 1 10-bit 0.25 °C 170 ms
1 0 11-bit 0.125 °C 340 ms
1 1 12-bit 0.0625 °C 680 ms