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C8051F54X Datasheet(PDF) 36 Page - Silicon Laboratories |
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C8051F54X Datasheet(HTML) 36 Page - Silicon Laboratories |
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36 / 276 page  C8051F54x 36 Rev. 1.1 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 5.3. 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 5.3: 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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