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User’s Manual 55

Reads the state of differential analog input channels and uses the previously set calibration constants to

convert it to volts.

PARAMETERS

channel is the analog input channel number (0 to 7) corresponding to LN0_IN to LN7_IN

gaincode is the gain code of 0 to 7.

RETURN VALUE

A voltage value corresponding to the voltage differential on the analog input channel.

ADOVERFLOW (defined macro = -4096) if overflow or out of range.

ADTIMEOUT

(defined macro = -4095) if conversion is incomplete or busy-bit timeout.

SEE ALSO

anaInCalib, anaIn, anaInmAmps, brdInit

float anaInDiff(unsigned int channel,

unsigned int gaincode);

channel DIFF

Voltage Range

(V)

0 +AIN0 -AIN1

-22.5 to +22.5

* Accessible on Prototyping Board.

1 +AIN1 -AIN1 —

2 +AIN2 -AIN3 -22.5 to +22.5*

3 +AIN3 -AIN3 —

4 +AIN4 -AIN5 -22.5 to +22.5*

5 +AIN5 -AIN5 —

6 +AIN6 -AIN7 —

7 +AIN7 -AIN7 —

Gain Code Multiplier

Voltage Range

(V)

* Applies to Prototyping Board.

0 ×1 -22.5 – +22.5

1 ×2 -11.25 – +11.25

2 ×4 -5.6 – +5.6

3 ×5 -4.5 – +4.5

4 ×8 -2.8 – +2.8

5 ×10 -2.25 – +2.25

6 ×16 -1.41 – +1.41

7 ×20 -1.126 – +1.126

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