Datasheet

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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