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TMP451JQDQFTQ1 Datasheet(PDF) 23 Page - Texas Instruments

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Part No. TMP451JQDQFTQ1
Description  TMP451-Q1 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) 23 Page - Texas Instruments

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T
=
ERR
h
1.008
-
1.008
(273.15+T( C))
°
´
DXP
DXN
SCL
SDA
THERM
GND
V+
ALERT / THERM2
Processor or
ASIC
SMBus
Controller
1
2
3
4
5
8
7
6
TMP451-Q1
1.7V to 3.6V
1.7V to 3.6V
Built-in Thermal
Transistor/Diode
Overtemperature Shutdown
23
TMP451-Q1
www.ti.com
SLOS877B – OCTOBER 2014 – REVISED JUNE 2019
Product Folder Links: TMP451-Q1
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Typical Application (continued)
Figure 19. TMP451-Q1 Basic Connections Using a Processor Built-In Remote Transistor
8.2.1 Design Requirements
The TMP451-Q1 device is designed to be used with either discrete transistors or substrate transistors built into
processor chips and ASICs. Either NPN or PNP transistors can be used, as long as the base-emitter junction is
used as the remote temperature sense. NPN transistors must be diode-connected. PNP transistors can either be
transistor- or diode-connected (see Figure 18).
Errors in remote temperature sensor readings are typically the consequence of the ideality factor and current
excitation used by the TMP451-Q1 device versus the manufacturer-specified operating current for a given
transistor. Some manufacturers specify a high-level and low-level current for the temperature-sensing substrate
transistors. The TMP451-Q1 device uses 7.5 μA for ILOW and 120 μA for IHIGH.
The ideality factor (η) is a measured characteristic of a remote temperature sensor diode as compared to an
ideal diode. The TMP451-Q1 allows for different η-factor values; see the η-Factor Correction Register section.
The ideality factor for the TMP451-Q1 device is trimmed to be 1.008. For transistors that have an ideality factor
that does not match the TMP451-Q1, Equation 4 can be used to calculate the temperature error.
NOTE
For the equation to be used correctly, actual temperature (°C) must be converted to Kelvin
(K).
where
TERR = error in the TMP451-Q1 device because η ≠ 1.008
η = ideality factor of remote temperature sensor
T(°C) = actual temperature
Degree delta is the same for °C and K.
(4)


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