LMP90100_13 datasheet(33/69 Pages) TI1

Part #	LMP90100

Description	LMP90100/LMP90099/LMP90098/LMP90097 Sensor AFE System: Multi-Channel, Low Power 24-Bit Sensor AFE with True Continuous Background Calibration

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Manufacturer	TI1 [Texas Instruments]

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Burnout

Current = 10 PA

VINP

VINN

VIN0

VIN1

VIN2

VIN3*

VIN4*

VIN5*

VIN6/VREFP2

VIN7/VREFN2

Burnout

Current = 10 PA

* VIN3, VIN4, VIN5 are only available for LMP90100 and LMP90099

LMP90100

www.ti.com

SNAS510P – JANUARY 2011 – REVISED MARCH 2013

Figure 48. Burnout Currents

Burnout Current Injection:

Burnout currents are injected differently depending on the channel scan mode selected.

When BURNOUT_EN = 1 and the device is operating in ScanMode0, 1, or 2, the burnout currents are injected

into all the channels for which the BURNOUT_EN bit is selected. This will cause problems and hence in this

mode, more than one channel should not have its BURNOUT_EN bit selected. Also, the burnout current will

interfere with the signal and introduce a fixed error depending on the particular external sensor.

When BURNOUT_EN = 1 and the device is operating in ScanMode3, burnout currents are injected into the last

sampled channel on a cyclical basis (Figure 49). In this mode, burnout currents injection is truly done in the

background without affecting the accuracy of the on-going conversion. Operating in this mode is recommended.

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