TMP411CD datasheet(33/61 Pages) TI2

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read command from address 00h for the local channel result, or from address 01h for the remote channel result.

The high byte is read first, followed by the low byte. Both bytes of this read operation are from the same ADC

conversion. The power-on-reset value of both temperature registers is 00h.

8.4 Limit Registers

The TMP411/TMP411D has 11 registers for setting comparator limits for the local and remote measurement

channels. These registers have read and write capability. The High and Low Limit Registers for both channels

span two registers, as do the temperature registers. The local temperature high limit is set by writing the high

byte to pointer address 0Bh, writing the low byte to pointer address 16h, or by using a single two-byte write

command (high byte first) to pointer address 0Bh. The local temperature high limit is read by the high byte from

pointer address 05h, the low byte from pointer address 16h, or by using a two-byte read command from pointer

address 05h. The power-on-reset value of the local temperature high limit is 5500h. The power-on-reset value of

the local temperature high limit is 5500h (85°C in standard temperature mode and 21°C in extended temperature

mode).

Similarly, the local temperature low limit is set by writing the high byte to pointer address 0Ch, writing the low

byte to pointer address 17h, or by using a single two-byte write command to pointer address 0Ch. The local

temperature low limit is read by the high byte from pointer address 06h, the low byte from pointer address 17h,

or by using a two-byte read from pointer address 06h. The power-on-reset value of the local temperature low

limit register is 00h (0°C in standard temperature mode, and −64°C in extended mode).

The remote temperature high limit is set by writing the high byte to pointer address 0Dh, writing the low byte to

pointer address 13h, or by using a two-byte write command to pointer address 0Dh. The remote temperature

high limit is read by the high byte from pointer address 07h, the low byte from pointer address 13h, or by using

a two-byte read command from pointer address 07h. The power-on-reset value of the Remote Temperature High

Limit Register is 55h or 00h (85°C in standard temperature mode, and 21°C in extended temperature mode).

The remote temperature low limit is set by writing the high byte to pointer address 0Eh, writing the low byte to

pointer address 14h, or by using a two-byte write to pointer address 0Eh. The remote temperature low limit is

read by the high byte from pointer address 08h, the low byte from pointer address 14h, or by using a two-byte

read from pointer address 08h. The power-on-reset value of the Remote Temperature Low Limit Register is 00h

(0°C in standard temperature mode, and −64°C in extended mode).

The TMP411/TMP411D has a THERM limit register for the local and remote channels. These registers are

eight bits and allow for THERM limits to be set to 1°C resolution. The local channel THERM limit is set by

writing to pointer address 20h. The remote channel THERM limit is set by writing to pointer address 19h. The

local channel THERM limit is read from pointer address 20h, and the remote channel THERM limit is read

from pointer address 19h. The power-on-reset value of the THERM limit registers is 55h (85°C in standard

temperature mode or 21°C in extended temperature mode). The THERM limit comparators have hysteresis.

The hysteresis of the comparators is set by writing to pointer address 21h. The hysteresis value is obtained by

reading from pointer address 21h. The Hysteresis Register value is an unsigned number that is always positive.

The power-on-reset value of this register is 0Ah (10°C).

When changing between standard and extended temperature ranges, note that the temperatures stored in the

temperature limit registers do not automatically reformat to correspond to the new temperature range format.

These values must be reprogrammed in the appropriate binary or extended binary format.

8.5 Status Register

The TMP411/TMP411D has a Status Register that reports the state of the temperature comparators. Table 8-2

lists the Status Register bits. The Status Register is read-only from pointer address 02h.

The BUSY bit reads as 1 if the ADC is making a conversion, and 0 if the ADC is not converting.

The OPEN bit reads as 1 if the remote transistor is 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 exceeds the remote THERM limit, remains greater than the

remote THERM limit, and less than the value in the shared Hysteresis Register, as shown in Figure 7-8.

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TMP411, TMP411D

SBOS383E – DECEMBER 2006 – REVISED JULY 2025

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