STDS75 Datasheet, PDF (17/37 Pages) STMicroelectronics – Digital temperature sensor and thermal watchdog

STDS75
Functional description
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 Table 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 Table 6). The entire register is volatile and thus powers-up in its default state only.
Table 6. Configuration register format
MSB
LSB
Byte
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
STDS75 Reserved RC1
RC0
FT1
FT0
POL
M
SD
Default
0
0
0
0
0
0
0
0
Keys:
SD =Shutdown Control Bit
M =Thermostat Mode⁽¹⁾
POL =Output Polarity⁽²⁾
FT1 =Fault Tolerance1 Bit
RC0 =Resolution Conversion0 Bit
RC1 =Resolution Conversion1 Bit
FT0 =Fault Tolerance0 Bit
Bit7 =Must be set to '0.' Reserved
1. Indicates Operation mode; 0 = Comparator mode, and 1 = Interrupt mode (see Comparator mode on
page 12 and Interrupt mode on page 13).
2. The OS/INT is active-low ('0').
Table 7. Programmable resolution configurations
RC1
RC0
Resolution
Conversion Time
Remarks
0
0
9-bit 0.5°C
150ms
Default Resolution
0
1
10-bit 0.25°C
1
0
11-bit 0.125°C
1
1
12-bit 0.0625°C
300ms
600ms
1200ms
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