Datasheet
STDS75 Functional description
Doc ID 13297 Rev 9 17/38
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 7 ), 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
Tabl e 6). The entire register is volatile and thus powers-up in its default state only.
Table 6. Configuration register format
Byte
MSB LSB
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
STDS75 Reserved 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 on
page 12 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 Bit7 = must be set to '0.' Reserved
Table 7. Programmable resolution configurations
RC1 RC0 Resolution Conversion time Remarks
0 0 9-bit 0.5 °C 150 ms Default resolution
0 1 10-bit 0.25 °C 300 ms
1 0 11-bit 0.125 °C 600 ms
1 1 12-bit 0.0625 °C 1200 ms