Datasheet

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SBAS317E − APRIL 2004 − REVISED MAY 2006
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70
ADC Control 0 (ADCON0)
7 6 5 4 3 2 1 0 Reset Value
SFR DCh — BOD EVREF VREFH EBUF PGA2 PGA1 PGA0 30h
BOD Burnout Detect. When enabled, this connects a positive current source to the positive channel and a negative
bit 6 current source to the negative channel. If the channel is open circuit, then the ADC results will be full-scale (buffer
must be enabled).
0 = Burnout Current Sources Off (default).
1 = Burnout Current Sources On.
EVREF Enable Internal Voltage Reference. If an external voltage is used, the internal voltage reference should be disabled.
bit 5 0 = Internal Voltage Reference Off for external reference.
1 = Internal Voltage Reference On (default). Note that in this mode, REFIN− must be connected to AGND.
VREFH Voltage Reference High Select. The internal voltage reference can be selected to be 2.5V or 1.25V.
bit 4 0 = REFOUT/REF IN+ is 1.25V.
1 = REFOUT/REF IN+ is 2.5V (default).
EBUF Enable Buffer. Enables the input buffer to provide higher input impedance but limits the input voltage range and
bit 3 dissipates more power.
0 = Buffer disabled (default).
1 = Buffer enabled. Input signal limited to AV
DD
− 1.5V.
PGA2−0 Programmable Gain Amplifier. Sets the gain for the PGA from 1 to 128.
bits 2−0
PGA2 PGA1 PGA0 GAIN
0 0 0 1 (default)
0 0 1 2
0 1 0 4
0 1 1 8
1 0 0 16
1 0 1 32
1 1 0 64
1 1 1 128