STDS75DS2E STMICROELECTRONICS [STMicroelectronics], STDS75DS2E Datasheet - Page 19

• Manufacturer Part Number: STDS75DS2E
• Description: Digital temperature sensor and thermal watchdog
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

3.1.5
Note:
3.2
Note:
Hysteresis temperature register (T
T
programmable lower trip-point temperature for the thermal alarm in two’s complement
format (see
0000).
The format of this register is the same as that of the Temperature Register. The 4 LSBs of
the T
position contains the sign bit for the digital temperature and Bit14 contains the temperature
MSB.
The resolution setting for the A/D conversion determines how many bits of the T
Register are used by the thermal alarm. For example, for 9-bit conversions, the hysteresis
temperature is defined by the 9 MSBs of the T
cares.”
Table 9.
These are comparable formats to the DS75 and LM75.
Power-up default conditions
The STDS75 always powers up in the following default states:
●
●
●
●
●
●
●
After power-up these conditions can be reprogrammed via the serial interface.
Keys:
STDS75
HYS
Bytes
Bits
Thermostat mode = Comparator Mode
Polarity = Active-low
Fault tolerance = 1 fault (i.e., relevant bits set to '0' in the Configuration register)
T
T
Register pointer = 00 (Temperature register)
Conversion resolution = 9-bit (i.e., RC0 = 0 and RC1 = 0 in the Configuration register;
see
HYS
Register is a two-byte (16-bit) READ/WRITE register that stores the user-
OS
HYS
TMSB =Temperature MSB
TLSB =Temperature LSB
Table 7 on page
SB =Two’s complement Sign Bit
TD =Temperature Data
= 80°C
Register are hardwired to zero, so data written to these bits is ignored. The MSB
MSB
= 75°C
SB
15
Table
T
OS
TMSB TD TD TD TD TD TD
and T
9). This register defaults to 75°C at power-up (i.e., 0100 1011 0000
14
HYS
13
MS Byte
17)
register format
12
THSB
11
10
9
HYS
HYS
8
)
Register, and all remaining bits are “Don’t
9-bit
LSB
7
10-bit
LSB
6
11-bit
LSB
TLSB
5
LS Byte
12-bit
LSB
4
3 2 1
0 0 0
HYS
19/37
LSB
0
0