TMP100MDBVREP datasheet(9/22 Pages) TI1

9 / 22 page

TMP100−EP, TMP101−EP

DIGITAL TEMPERATURE SENSOR

WITH I2C INTERFACE

SGLS254A − JULY 2005 - REVISED APRIL 2010

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

high and low limit registers

In comparator mode (TM = 0), the ALERT pin of the TMP101 becomes active when the temperature equals or

exceeds the value in THIGH and generates a consecutive number of faults according to fault bits F1 and F0. The

ALERT pin remains active until the temperature falls below the indicated TLOW value for the same number of

faults.

In Interrupt Mode (TM = 1) the ALERT Pin becomes active when the temperature equals or exceeds THIGH for

a consecutive number of fault conditions. The ALERT pin remains active until a read operation of any register

occurs or the device successfully responds to the SMBus Alert Response Address. The ALERT pin will also be

cleared if the device is placed in Shutdown Mode. Once the ALERT pin is cleared, it will only become active again

by the temperature falling below TLOW. When the temperature falls below TLOW, the ALERT pin becomes active

and remains active until cleared by a read operation of any register or a successful response to the SMBus Alert

Response Address. Once the ALERT pin is cleared, the above cycle repeats with the ALERT pin becoming

active when the temperature equals or exceeds THIGH. The ALERT pin can also be cleared by resetting the

device with the General Call Reset command. This also clears the state of the internal registers in the device

returning the device to Comparator Mode (TM = 0).

The ALERT pin function for both operational modes is represented in Figure 4. Table 9 and Table 10 describe

the format for the THIGH and TLOW registers. Power-up reset values for THIGH and TLOW are: THIGH = 80°C and

TLOW = 75°C. The format of the data for THIGH and TLOW is the same as for the temperature register.

All 12 bits for the temperature, THIGH, and TLOW registers are used in the comparisons for the ALERT function

for all converter resolutions. The three LSBs in THIGH and TLOW can affect the ALERT output even if the

converter is configured for 9-bit resolution.

Byte

H11

H10

Byte

Table 9. Bytes 1 and 2 of THIGH Register

Byte

L11

L10

Byte

Table 10. Bytes 1 and 2 of TLOW Register

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