TMP411D datasheet(33/60 Pages) TI2

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8.4 Limit Registers

The TMP411-Q1 and TMP411D-Q1 have 11 registers for setting comparator limits for both 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 and 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 obtained by reading the high byte from pointer address 05h and 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 55h/6Eh/00h (85°C in standard temperature mode for TMP411A-Q1/TMP411DA-Q1 to

TMP411C-Q1/TMP411DC-Q1; 110°C in standard temperature mode for TMP411D-Q1/TMP411DD-Q1, 21°C in

extended temperature range).

Similarly, the local-temperature low limit is set by writing the high byte to pointer address 0Ch and 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 reading the high byte from pointer address 06h and 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/00h (0°C in standard temperature mode; –64°C in extended mode).

The remote temperature high limit is set by writing the high byte to pointer address 0Dh and 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 obtained by reading the high byte from pointer address 07h and 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/6Eh/00h (85°C in standard temperature mode

for TMP411A-Q1/TMP411DA-Q1 to TMP411C-Q1/TMP411DC-Q1; 110°C in standard temperature mode for

TMP411D-Q1/TMP411DD-Q1, 21°C in extended temperature mode).

The remote temperature low limit is set by writing the high byte to pointer address 0Eh and 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 reading the high byte from pointer address 08h and 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

The TMP411-Q1 and TMP411D-Q1 also have THERM limit registers for both the local and the remote channels.

These registers are eight bits and allow for THERM limits set to 1°C resolution. The local channel THERM

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

pointer address 19h. The local channel THERM limit is obtained by reading 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/6Eh/00h (85°C in standard temperature mode for TMP411A-Q1/TMP411DA-Q1 to TMP411C-

Q1/TMP411DC-Q1; 110°C in standard temperature mode for TMP411D-Q1/TMP411DD-Q1; 21°C in extended

temperature mode). The THERM limit comparators also have hysteresis. The hysteresis of both comparators

is set by writing to the pointer address 21h. The hysteresis value is obtained by reading from pointer address

21h. The Hysteresis Register value is an unsigned number (always positive). The power-on-reset value of this

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

the temperature limit registers are not automatically reformatted 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-Q1 and TMP411D-Q1 have a Status Register to report the state of the temperature comparators.

Table 8-2 shows 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.

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TMP411-Q1, TMP411D-Q1

SBOS527G – DECEMBER 2010 – REVISED SEPTEMBER 2025

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