C8051F040-GQR datasheet(83/328 Pages) SILABS

Part #	C8051F040-GQR

Description	Mixed Signal ISP Flash MCU Family

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Manufacturer	SILABS [Silicon Laboratories]

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C8051F040/1/2/3/4/5/6/7

Rev. 1.5

83

Figure 6.7. ADC0 Data Word Example

10-bit ADC Data Word appears in the ADC Data Word Registers as follows:

ADC0H[1:0]:ADC0L[7:0], if ADLJST = 0

(ADC0H[7:2] will be sign-extension of ADC0H.1 for a differential reading,

otherwise = 000000b).

ADC0H[7:0]:ADC0L[7:6], if ADLJST = 1

(ADC0L[5:0] = 000000b).

Example: ADC Data Word Conversion Map, AIN0 Input in Single-Ended Mode

(AMX0CF = 0x00, AMX0SL = 0x00)

Example: ADC Data Word Conversion Map, AIN0-AIN1 Differential Input Pair

(AMX0CF = 0x01, AMX0SL = 0x00)

ADLJST = 0:

; ‘n’ = 10 for Single-Ended; ‘n’=9 for Differential.

AIN0-AGND (Volts)

ADC0H:ADC0L

(ADLJST = 0)

ADC0H:ADC0L

(ADLJST = 1)

VREF * (1023/1024)

0x03FF

0xFFC0

VREF / 2

0x0200

0x8000

VREF * (511/1024)

0x01FF

0x7FC0

0

0x0000

AIN0-AGND (Volts)

ADC0H:ADC0L

(ADLJST = 0)

ADC0H:ADC0L

(ADLJST = 1)

VREF * (511/512)

0x01FF

0x7FC0

VREF / 2

0x0100

0x4000

VREF * (1/512)

0x0001

0x0040

0

0x0000

-VREF * (1/512)

0xFFFF (-1)

0xFFC0

-VREF / 2

0xFF00 (-256)

0xC000

-VREF

0xFE00 (-512)

0x8000

Code

Vin

Gain

VREF

---------------



2n



=

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