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TMP451JQDQFTQ1 Datasheet(PDF) 20 Page - Texas Instruments

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Part No. TMP451JQDQFTQ1
Description  짹1째C Remote and Local Temperature Sensor With 管-Factor and Offset Correction, Series-Resistance Cancellation, and Programmable Digital Filter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TMP451JQDQFTQ1 Datasheet(HTML) 20 Page - Texas Instruments

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TMP451-Q1
SLOS877B – OCTOBER 2014 – REVISED JUNE 2019
www.ti.com
Product Folder Links: TMP451-Q1
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Copyright © 2014–2019, Texas Instruments Incorporated
7.6.1.5 Conversion Rate Register
The conversion rate register (read address 04h, write address 0Ah) controls the rate at which temperature
conversions are performed. This register adjusts the idle time between conversions but not the conversion time
itself, thereby allowing the TMP451-Q1 power dissipation to be balanced with the temperature register update
rate. Table 7 lists the conversion rate options and corresponding time between conversions. The default value of
the register is 08h, which gives a default rate of 16 conversions per second.
Table 7. Conversion Rate
VALUE
CONVERSIONS PER SECOND
TIME (SECONDS)
00h
0.0625
16
01h
0.125
8
02h
0.25
4
03h
0.5
2
04h
1
1
05h
2
0.5
06h
4
0.25
07h
8
0.125
08h
16 (default)
0.0625 (default)
09h
32
0.03125
7.6.1.6 One-Shot Start Register
When the TMP451-Q1 device is in shutdown mode (SD = 1 in the configuration register), a single conversion is
started by writing any value to the one-shot start register, pointer address 0Fh. This write operation starts one
conversion and comparison cycle on both the local and the remote sensors. The TMP451-Q1 device returns to
shutdown mode when the cycle completes. The value of the data sent in the write command is irrelevant and is
not stored by the TMP451-Q1 device.
7.6.1.7 η-Factor Correction Register
The TMP451-Q1 device allows for a different η-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 shows this voltage and
temperature.
(1)
The value η in Equation 1 is a characteristic of the particular transistor used for the remote channel. The power-
on reset value for the TMP451-Q1 device is η = 1.008. The value in the η-factor correction register may be used
to adjust the effective η-factor according to Equation 2 and Equation 3.
(2)
(3)
The η-factor correction value must be stored in twos complement format, yielding an effective data range from
–128 to 127. The η-factor correction value is written to and read from pointer address 23h. The register power-on
reset value is 00h, thus having no effect unless a different value is written to it.
Table 8. η-Factor Range
NADJUST
η
BINARY
HEX
DECIMAL
0111 1111
7F
127
0.950198
0000 1010
0A
10
1.003195


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