TMP451

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SBOS686A – JUNE 2013 – REVISED DECEMBER 2014

Table 6. Status Register Field Descriptions

Bit

Field

Type

Reset

Description

7

BUSY

R

N/A

ADC status indicator

1 = ADC is converting.

0 = ADC is not converting.

6

LHIGH

R

N/A

Local temperature high limit status indicator(1)

1 = Local temperature value exceeds the Local Temperature

High Limit Register value. This bit is cleared upon reading the

Status Register providing that the condition causing the over

temperature result is no longer present.

0 = Local temperature value does not exceed the Local

Temperature High Limit Register value.

5

LLOW

R

N/A

Local temperature low limit status indicator(1)

1 = Local temperature value is below the Local Temperature

Low Limit Register value. This bit is cleared upon reading the

Status Register providing that the condition causing the under

temperature result is no longer present.

0 = Local temperature value is not below the Local Temperature

Low Limit Register value.

4

RHIGH

R

N/A

Remote temperature high limit status indicator(1)

1 = Remote temperature value exceeds the Remote

Temperature High Limit Register value. This bit is cleared upon

reading the Status Register providing that the condition causing

the over temperature result is no longer present.

0 = Remote temperature value does not exceed the Remote

Temperature High Limit Register value.

3

RLOW

R

N/A

Remote temperature low limit status indicator(1)

1 = Remote temperature value is below the Remote

Temperature Low Limit Register value. This bit is cleared upon

reading the Status Register providing that the condition causing

the under temperature result is no longer present.

0 = Remote temperature value is not below the Remote

Temperature Low Limit Register value.

2

OPEN

R

N/A

Remote junction open circuit detection(1)

1 = The remote junction is an open circuit. This bit is cleared

upon reading the Status Register providing that the condition

causing the open circuit is no longer present.

0 = The remote junction is not an open circuit.

1

RTHRM

R

N/A

Remote THERM limit status indicator

1 = Remote THERM limit is tripped. This bit is cleared upon

reading the Status Register providing that the condition causing

the over temperature result is no longer present.

0 = Remote THERM limit is not tripped.

0

LTHRM

R

N/A

Local THERM limit status indicator

1 = Local THERM limit is tripped. This bit is cleared upon

reading the Status Register providing that the condition causing

the over temperature result is no longer present.

0 = Local THERM limit is not tripped.

(1)

These flags stay high until the status register is read or they are reset by a POR when pin 6 is configured as ALERT. Only bit 2 (OPEN)

stays high until the status register is read or it is reset by a POR when pin 6 is configured as THERM2.

The status register reports the state of the temperature ADC, the temperature limit comparators, and the

connection to the remote sensor. Table 6 lists the status register bits. The status register is read-only, and is

read by accessing pointer address 02h.

The LHIGH and LLOW bits indicate a local sensor overtemperature or undertemperature event, respectively. The

RHIGH and RLOW bits indicate a remote sensor overtemperature or undertemperature event, respectively. The

OPEN bit indicates an open-circuit condition on the remote sensor. When pin 6 is configured as the ALERT

output, the five flags are NORed together. If any of the five flags are high, the ALERT interrupt latch is set and

the ALERT output goes low. Reading the status register clears the five flags, provided that the condition that

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