TMP411D datasheet(36/60 Pages) TI2

36 / 60 page

Bits 2 through 4 of the Resolution Register must always be set to 1. Bits 5 through 7 of the Resolution Register

must always be set to 0. The power-on-reset value of this register is 1Ch.

8.8 Conversion Rate Register

The Conversion Rate Register controls the rate at which temperature conversions are performed. This register

adjusts the idle time between conversions but not the conversion timing, thereby allowing TMP411-Q1 and

TMP411D-Q1 power dissipation to be balanced with the temperature register update rate. Table 8-5 shows the

conversion rate options and corresponding current consumption.

Table 8-5. Conversion Rate Register

CONVERSION RATE REGISTER (Read = 04h, Write = 0Ah, POR = 08h)

CONVERSIONS

PER SECOND

AVERAGE IQ (TYPICAL) (µA)

TMP411-Q1 (Legacy chip)

AVERAGE IQ (TYPICAL) (µA)

TMP411-Q1 (New chip)

TMP411D-Q1

V+ = 2.7V

V+ = 5.5V

V+ = 2.7V and 5.5V

0.0625

1.5

0.125

1.8

0.25

2.5

0.5

3.8

103

6.5

128

155

190

220

07h to 0Fh

373

413

8.9 N-factor Correction Register

The TMP411-Q1 and TMP411D-Q1 allow for a different n-factor value to be used for converting remote channel

measurements to temperature. The remote channel uses sequential current excitation to extract a differential

VBE voltage measurement to determine the temperature of the remote transistor. Equation 1 relates this voltage

and temperature.

VBE2−VBE1=nkTq×ln I2I1

(1)

The value n is a characteristic of the particular transistor used for the remote channel. The default value for the

TMP411-Q1 and TMP411D-Q1 devices is n = 1.008. The value in the N-Factor Correction Register can be used

to adjust the effective n-factor according to Equation 2 and Equation 3.

neff= 1.008×300

300−NADJUST

(2)

NADJUST=300−300×1.008

neff

(3)

The n-correction value must be stored in two’s-complement format, yielding an effective data range from −128

to 127, as shown in Table 8-6. The n-correction value can be written to and read from pointer address 18h. The

Table 8-6. N-Factor Range

NADJUST

BINARY

HEX

DECIMAL

0111 1111

127

1.747977

0000 1010

1.042759

0000 1000

1.035616

0000 0110

1.028571

TMP411-Q1, TMP411D-Q1

SBOS527G – DECEMBER 2010 – REVISED SEPTEMBER 2025

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