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TMP464

SBOS835 – MAY 2017

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Table 4. Software Reset Register Format

STATUS REGISTER (READ = 20h, WRITE = 20h, POR = 0x0000)

BIT NUMBER

BIT NAME

FUNCTION

RST

1 software reset device; writing a value of 0 is ignored

14-0

Reserved for future use; always reports 0

7.6.1.4 THERM Status Register

The THERM Status register reports the state of the THERM limit comparators for local and four remote

temperatures. Table 5 lists the status register bits. The THERM Status register is read-only and is read by

accessing pointer address 21h.

Table 5. THERM Status Register Format

THERM STATUS REGISTER (READ = 21h, WRITE = N/A)

BIT NUMBER

BIT NAME

FUNCTION

15:12

Reserved for future use; always reports 0.

R4TH

1 when Remote 4 exceeds the THERM limit

R3TH

1 when Remote 3 exceeds the THERM limit

R2TH

1 when Remote 2 exceeds the THERM limit

R1TH

1 when Remote 1 exceeds the THERM limit

LTH

1 when Local sensor exceeds the THERM limit

6:0

Reserved for future use; always reports 0.

The R4TH:R1TH and LTH flags are set when the corresponding temperature exceeds the respective

programmed THERM limit (39h, 42h, 4Ah, 52h, and 5Ah). 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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