TMP468 Datasheet, PDF (23/40 Pages) Texas Instruments – 9-Channel (8-Remote and 1-Local), High-Accuracy Temperature Sensor

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BIT NUMBER
15
14-0
TMP468
SBOS762 – NOVEMBER 2016
Table 4. Software Reset Register Format
STATUS REGISTER (READ = 20h, WRITE = 20h, POR = 0x0000)
BIT NAME
FUNCTION
RST
1 software reset device; writing a value of 0 will be ignored
0
Reserved for future use; will always report 0
8.6.1.4 THERM Status Register
The THERM status register reports the state of the THERM limit comparators for local and eight remote
temperatures. Table 5 lists the status register bits. The THERM status register is read-only and is read by
accessing pointer address 21h.
BIT NUMBER
15
14
13
12
11
10
9
8
7
6:0
Table 5. THERM Status Register Format
THERM STATUS REGISTER (READ = 21h, WRITE = N/A)
BIT NAME
FUNCTION
R8TH
1 when remote 8 exceeds its THERM limit
R7TH
1 when remote 7 exceeds its THERM limit
R6TH
1 when remote 6 exceeds its THERM limit
R5TH
1 when remote 5 exceeds its THERM limit
R4TH
1 when remote 4 exceeds its THERM limit
R3TH
1 when remote 3 exceeds its THERM limit
R2TH
1 when remote 2 exceeds its THERM limit
R1TH
1 when remote 1 exceeds its THERM limit
LTH
1 when local sensor exceeds its THERM limit
0
Reserved for future use; will always report 0
The R8TH:R8TH and LTH flags are set when the corresponding temperature exceeds their respective
programmed THERM limit (39h, 42h, 4Ah, 52h, 5Ah, 62h, 6Ah, 72h, 7Ah). These flags are reset automatically
when the temperature returns below the THERM limit minus the value set in the THERM Hysteresis register
(38h). The THERM output goes low in the case of overtemperature on either the local or remote channels, and
goes high as soon as the measurements are less than the THERM limit minus the value set in the THERM
Hysteresis register. The THERM hysteresis register (38h) allows hysteresis to be added so that the flag resets
and the output goes high when the temperature returns to or goes below the limit value minus the hysteresis
value.
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