TMP411CD datasheet(13/48 Pages) TI2

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TMP411

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SBOS383D – DECEMBER 2006 – REVISED DECEMBER 2016

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Feature Description (continued)

Table 1. Temperature Data Format (Local and Temperature High Bytes)

TEMP (°C)

LOCAL AND REMOTE TEMPERATURE REGISTER HIGH BYTE VALUE (1°C RESOLUTION)

STANDARD BINARY

EXTENDED BINARY

BINARY

HEX

BINARY

HEX

–64

0000 0000

–50

0000 0000

0000 1110

–25

0000 0000

0010 0111

0000 0000

0100 0000

0000 0001

0100 0001

0000 0101

0100 0101

0000 1010

0100 1010

0001 1001

0101 1001

0011 0010

0111 0010

0100 1011

1000 1011

100

0110 0100

1010 0100

125

0111 1101

1011 1101

127

0111 1101

1011 1111

150

0111 1111

1101 0110

175

0111 1111

1110 1111

191

0111 1111

1111 1111

9.3.4 THERM (Pin 4) and ALERTor THERM2 (Pin 6)

The THERM and ALERT or THERM2 pins on the TMP411 device are dedicated to alarm functions. The pins are

open-drain outputs that each require a pullup resistor to V+. These pins can be wire-ORed together with other

alarm pins for system monitoring of multiple sensors. The THERM pin provides a thermal interrupt that cannot be

software disabled. The ALERT pin is an earlier warning interrupt, and can be software disabled or masked. The

ALERT or THERM2 pin can be configured as aTHERM2 pin, which is a second THERM pin (Configuration

The THERM pin asserts low when the measured local or remote temperature is outside of the temperature range

programmed in the corresponding Local and Remote THERM Limit Register. The THERM temperature limit

range can be programmed with a wider range than that of the limit registers, which allows the ALERTpin to

provide an earlier warning than the THERM pin. The THERM alarm resets automatically when the measured

temperature falls within the THERM temperature limit range minus the hysteresis value stored in the THERM

Hysteresis Register. The permitted hysteresis values are listed in Table 10. The default hysteresis is 10°C. When

the ALERT or THERM2 pin is configured as a second thermal alarm (Configuration Register: bit 7 = 0, bit 5 = 1),

the pin functions the same as the THERM pin, but uses the temperatures stored in the Local and Remote

Temperature High and Low Limit Registers to set the comparison range.

When ALERT or THERM2 (pin 6) is configured as an ALERT pin, (Configuration Register: bit 7 = 0, bit 5 = 0),

the pin asserts low when the measured local or remote temperature violates the range limit set by the

corresponding Local and Remote Temperature High and Low Limit Registers. The alert function configures to

assert only if the range is violated a specified number of consecutive times (either one, two, three or four times).

The consecutive violation limit is set in the Consecutive Alert Register. Required consecutive faults prevent false

alerts that are caused by environmental noise. The ALERT pin asserts low if the remote temperature sensor is

open-circuit. When the MASK function is enabled (Configuration Register: bit 7 = 1), the ALERT pin is disabled

(that is, masked). TheALERT pin resets when the master reads the device address, as long as the condition that

caused the alert no longer persists, and the Status Register is reset.

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