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TMP451JQDQWRQ1 Datasheet(PDF) 11 Page - Texas Instruments

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Part No. TMP451JQDQWRQ1
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

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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
Additionally, a digital filter is available for the remote temperature measurements to further reduce the effect of
noise. This filter is programmable and has two levels when enabled. Level 1 performs a moving average of four
consecutive samples. Level 2 performs a moving average of eight consecutive samples. The value stored in the
remote temperature result register is the output of the digital filter, and the ALERT and THERM limits are
compared to it. This provides additional immunity to noise and spikes on the ALERT and THERM outputs. The
filter responses are shown in Figure 12. The filter can be enabled or disabled by programming the desired levels
in the digital filter register. The digital filter is disabled by default and on POR.
Figure 12. Filter Response to Impulse and Step Inputs
7.3.5 Sensor Fault
The TMP451-Q1 device can sense a fault at the D+ input resulting from incorrect diode connection. The
TMP451-Q1 device can also sense an open circuit. Short-circuit conditions return a value of –64°C. The
detection circuitry consists of a voltage comparator that trips when the voltage at D+ exceeds (V+) – 0.3 V
(typical). The comparator output is continuously checked during a conversion. If a fault is detected, then OPEN
(bit 2) in the status register is set to 1.
When not using the remote sensor with the TMP451-Q1 device, the D+ and D– inputs must be connected
together to prevent meaningless fault warnings.


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