TMP401AIDGKTG4【PDF 11/28 页】IC TEMP SENSOR DGTL OUT 8-MSOP

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Sheet目录47

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TMP401

SBOS371A AUGUST 2006 REVISED OCTOBER 2007

www.ti.com

STATUS REGISTER

The TMP401 has a status register to report the state of the

temperature comparators. Table 4 shows the Status

by reading from pointer address 02h.

The BUSY bit reads as 1 if the ADC is making a

conversion. It reads as 0 if the ADC is not converting.

The OPEN bit reads as 1 if the remote transistor was

detected as open since the last read of the Status Register.

The OPEN status is only detected when the ADC is

attempting to convert a remote temperature.

The RTHRM bit reads as 1 if the remote temperature has

exceeded the remote THERM limit and remains greater

than the remote THERM limit less the value in the shared

hysteresis register; see Figure 17.

The LTHRM bit reads as 1 if the local temperature has

exceeded the local THERM limit and remains greater than

the local THERM limit less the value in the shared

hysteresis register; see Figure 17.

The LHIGH and RHIGH bit values depend on the state of

the AL/TH bit in the Configuration Register. If the AL/TH bit

is 0, the LHIGH bit reads as 1 if the local high limit was

exceeded since the last clearing of the Status Register.

The RHIGH bit reads as 1 if the remote high limit was

exceeded since the last clearing of the Status Register. If

the AL/TH bit is 1, the remote high limit and the local high

limit are used to implement a THERM2

function. LHIGH

reads as 1 if the local temperature has exceeded the local

high limit and remains greater than the local high limit less

the value in the Hysteresis Register.

The RHIGH bit reads as 1 if the remote temperature has

exceeded the remote high limit and remains greater than

the remote high limit less the value in the Hysteresis

The LLOW and RLOW bits are not affected by the AL/TH

bit. The LLOW bit reads as 1 if the local low limit was

exceeded since the last clearing of the Status Register.

The RLOW bit reads as 1 if the remote low limit was

exceeded since the last clearing of the Status Register.

The values of the LLOW, RLOW, and OPEN (as well as

LHIGH and RHIGH when AL/TH is 0) are latched and will

read as 1 until the Status Register is read or a device reset

occurs. These bits are cleared by reading the Status

set no longer exists. The values of BUSY, LTHRM, and

RTHRM (as well as LHIGH and RHIGH when AL/TH is 1)

are not latched and are not cleared by reading the Status

updated appropriately at the end of the corresponding

ADC conversion. Clearing the Status Register bits does

not clear the state of the ALERT

pin; an SMBus alert

response address command must be used to clear the

ALERT

pin.

The TMP401 NORs LHIGH, LLOW, RHIGH, RLOW, and

OPEN, so a status change for any of these flags from 0

to 1 automatically causes the ALERT

pin to go low (only

applies when the ALERT

/THERM2

pin is configured for

ALERT mode).

Table 4. Status Register Format

STATUS REGISTER (Read = 02h, Write = NA)

BIT #

BIT NAME

BUSY

LHIGH

LLOW

RHIGH

RLOW

OPEN

RTHRM

LTHRM

POR VALUE

(1)

The BUSY bit will change to 1 almost immediately (<< 100祍) following power-up, as the TMP401 begins the first temperature conversion.

It will be high whenever the TMP401 is converting a temperature reading.

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