C8051F02X Datasheet, PDF (52/272 Pages) Silicon Laboratories – 8K ISP FLASH MCU Family

C8051F020/1
Figure 5.11. ADC0 Data Word Example (C8051F020/1)
12-bit ADC0 Data Word appears in the ADC0 Data Word Registers as follows:
ADC0H[3:0]:ADC0L[7:0], if AD0LJST = 0
(ADC0H[7:4] will be sign-extension of ADC0H.3 for a differential reading, otherwise =
0000b).
ADC0H[7:0]:ADC0L[7:4], if AD0LJST = 1
(ADC0L[3:0] = 0000b).
Example: ADC0 Data Word Conversion Map, AIN0 Input in Single-Ended Mode
(AMX0CF = 0x00, AMX0SL = 0x00)
AIN0-AGND (Volts)
ADC0H:ADC0L
(AD0LJST = 0)
ADC0H:ADC0L
(AD0LJST = 1)
VREF * (4095/4096)
0x0FFF
0xFFF0
VREF / 2
0x0800
0x8000
VREF * (2047/4096)
0x07FF
0x7FF0
0
0x0000
0x0000
Example: ADC0 Data Word Conversion Map, AIN0-AIN1 Differential Input Pair
(AMX0CF = 0x01, AMX0SL = 0x00)
AIN0-AGND (Volts)
ADC0H:ADC0L
(AD0LJST = 0)
ADC0H:ADC0L
(AD0LJST = 1)
VREF * (2047/2048)
0x07FF
0x7FF0
VREF / 2
0x0400
0x4000
VREF * (1/2048)
0x0001
0x0010
0
0x0000
0x0000
-VREF * (1/2048)
0xFFFF (-1d)
0xFFF0
-VREF / 2
0xFC00 (-1024d)
0xC000
-VREF
0xF800 (-2048d)
0x8000
For AD0LJST = 0:
Code = Vin × --^G-----^a---ⁱ--ⁿ--- × 2ⁿ ; ‘n’ = 12 for Single-Ended; ‘n’=11 for Differential.
VREF
52
Rev. 1.4