TCN75A_1 Datasheet, PDF (20/40 Pages) Microchip Technology – 2-Wire Serial Temperature Sensor

TCN75A
5.3.3 TEMPERATURE HYSTERESIS
REGISTER (T_HYST)
The TCN75A has a 16-bit read/write Temperature
Hysteresis register that contains a 9-bit data in two’s
compliment format. This register is used to set a
hysteresis for the T_SET limit. Therefore, the data
represents a minimum temperature limit. If the ambient
temperature drifts below the specified limit, the
TCN75A asserts an alert output (refer to
Section 5.3.4.3 “ALERT Output Configuration”).
This register uses the nine Most Significant bits (MSbs)
and all other bits are “don’t cares”.
The power-up default value of T_HYST register is 75°C,
or <0100 1011 0>b in binary.
REGISTER 5-4:
Upper Half:
R/W-0
Sign
bit 15
TEMPERATURE HYSTERESIS REGISTER (T_HYST) — ADDRESS <0000 0010>b
R/W-1
2⁶ °C
R/W-0
2⁵ °C
R/W-0
2⁴ °C
R/W-1
2³ °C
R/W-0
2² °C
R/W-1
2¹ °C
R/W-1
2⁰ °C
bit 8
Lower Half:
R/W-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
2^-1 °C
0
0
0
0
0
0
0
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
DS21935D-page 20
 2010 Microchip Technology Inc.