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C8051F50X Datasheet(PDF) 59 Page - Silicon Laboratories

Part # C8051F50X
Description  Mixed Signal ISP Flash MCU Family
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

C8051F50X Datasheet(HTML) 59 Page - Silicon Laboratories

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Rev. 1.1
59
C8051F50x-F51x
For example, if ADC0GNH = 0xFC, ADC0GNL = 0x00, and GAINADD = 1, GAIN = 0xFC0 = 4032, and the
resulting equation is as follows:
The table below equates values in the ADC0GNH, ADC0GNL, and ADC0GNA registers to the equivalent
gain using this equation.
For any desired gain value, the GAIN registers can be calculated by the following:
Equation 6.3. Calculating the ADC0GNH and ADC0GNL Values from the Desired Gain
Where:
GAIN is the 12-bit word of ADC0GNH[7:0] and ADC0GNL[7:4]
GAINADD is the value of the GAINADD bit (ADC0GNA.0)
gain is the equivalent gain value from 0 to 1.016
When calculating the value of GAIN to load into the ADC0GNH and ADC0GNL registers, the GAINADD bit
can be turned on or off to reach a value closer to the desired gain value.
For example, the initial example in this section requires a gain of 0.44 to convert 5 V full scale to 2.2 V full
scale. Using Equation 6.3:
If GAINADD is set to 1, this makes the equation:
The actual gain from setting GAINADD to 1 and ADC0GNH and ADC0GNL to 0x6CA is 0.4399. A similar
gain can be achieved if GAINADD is set to 0 with a different value for ADC0GNH and ADC0GNL.
ADC0GNH Value
ADC0GNL Value
GAINADD Value
GAIN Value
Equivalent Gain
0xFC (default)
0x00 (default)
1 (default)
4032 + 64
1.0 (default)
0x7C
0x00
1
1984 + 64
0.5
0xBC
0x00
1
3008 + 64
0.75
0x3C
0x00
1
960 + 64
0.25
0xFF
0xF0
0
4095 + 0
~1.0
0xFF
0xF0
1
4096 + 64
1.016
GAIN
4032
4096
-------------


1
1
64
------


+
0.984
0.016
+1.0
==
=
GAIN
gain
GAINADD
1
64
------




4096
=
GAIN
0.44
GAINADD
1
64
------




4096
=
GAIN
0.44
1
1
64
------




4096
0.424
4096
1738
0x06CA
==
=
=


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