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The effects of changing the calibration register values are given in Table 25.5 (p. 351) . Step
by step calibration procedures for offset and gain are given in Section 25.3.10.1 (p. 351) and
Section 25.3.10.2 (p. 351) .
Table 25.5. Calibration Register Effect
Calibration Register
ADC Result
Lowest Output
Calibration Binary Value
0111111
3F
Calibration Hex Value
Offset
Gain
Highest Output
Lowest Output
Highest Output
1000000
0000000
1111111
40
00
7F
The offset calibration register expects a signed 2’s complement value with negative effect. A high value
gives a low ADC reading.
The gain calibration register expects an unsigned value with positive effect. A high value gives a high
ADC reading.
25.3.10.1 Offset Calibration
Offset calibration must be performed prior to gain calibration. Follow these steps for the offset calibration
in single mode:
1. Select wanted reference by setting the REF bitfield of the ADCn_SINGLECTRL register.
2. Set the AT bitfield of the ADCn_SINGLECTRL register to 16CYCLES.
3. Set the INPUTSEL bitfield of the ADCn_SINGLECTRL register to DIFF0, and set the DIFF bitfield to
1 for enabling differential input. Since the input voltage is 0, the expected ADC output is the half of
the ADC code range as it is in differential mode.
4. A binary search is used to find the offset calibration value. Set the SINGLESTART bit in the
ADCn_CTRL register and read the ADCn_SINGLEDATA register. The result of the binary search is
written to the SINGLEOFFSET field of the ADCn_CAL register.
25.3.10.2 Gain Calibration
Offset calibration must be performed prior to gain calibration. The Gain Calibration is done in the following
manner:
1. Select an external ADC channel (a differential channel can also be used).
2. Apply an external voltage on the selected ADC input channel. This voltage should correspond to the
top of the ADC range.
3. A binary search is used to find the gain calibration value. Set the SINGLESTART bit in the
ADCn_CTRL register and read the ADCn_SINGLEDATA register. The target value is ideally the top
of the ADC range, but it is recommended to use a value a couple of LSBs below in order to avoid
overshooting. The result of the binary search is written to the SINGLEGAIN field of the ADCn_CAL
register.
2011-04-12 - d0001_Rev1.10
351
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