LMP90100_16 Datasheet, PDF (30/74 Pages) Texas Instruments – Sensor AFE System: Multichannel, Low-Power, 24-Bit Sensor AFE

LMP90100, LMP90099, LMP90098, LMP90097
SNAS510S – JANUARY 2011 – REVISED JANUARY 2016
Feature Description (continued)
Burnout Currents
BURNOUT_EN
CH0 is being sampled
CH0
CH1
CH2 CH3
BURNOUT_EN
CH1 is being sampled
CH0 CH1 CH2 CH3
BURNOUT_EN
CH2 is being sampled
CH0
CH1
CH2 CH3
BURNOUT_EN
CH3 is being sampled
CH0 CH1 CH2 CH3
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Figure 57. Burnout Currents Injection for ScanMode3
9.3.8.3 Sensor Diagnostic Flags
Burnout currents can be used to verify that an external sensor is still operational before attempting to make
measurements on that channel. A non-operational sensor means that there is a possibility the connection
between the sensor and the LMP90xxx is open circuited, short circuited, shorted to VA or GND, overloaded, or
the reference may be absent. The sensor diagnostic flags diagram can be seen in Figure 58.
VINP
VINN
RAILS_FLAG
Generator
FGA
BUFF
Modulator
Overflow detection
RAILS_FLAG
OFLO_FLAGS
Filter
ADC_DOUT
RAILS_FLAG
Generator
SENDIAG_THLDH
and SENDIAG_THLDL
RAILS_FLAG
SHORT_THLD_
FLAG
Figure 58. Sensor Diagnostic Flags Diagram
The sensor diagnostic flags are located in the SENDIAG_FLAGS register and are described in further details
below.
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