C8051F331 datasheet(44/216 Pages) SILABS

44 / 216 page

C8051F330/1/2/3/4/5

Rev. 1.5

measured from ‘0’ to VREF x 1023/1024. Example codes are shown below for both right-justified and left-

justified data. Unused bits in the ADC0H and ADC0L registers are set to ‘0’.

When in Differential Mode, conversion codes are represented as 10-bit signed 2’s complement numbers.

Inputs are measured from –VREF to VREF x 511/512. Example codes are shown below for both right-jus-

tified and left-justified data. For right-justified data, the unused MSBs of ADC0H are a sign-extension of the

data word. For left-justified data, the unused LSBs in the ADC0L register are set to ‘0’.

Important Note About ADC0 Input Configuration: Port pins selected as ADC0 inputs should be config-

ured as analog inputs, and should be skipped by the Digital Crossbar. To configure a Port pin for analog

input, set to ‘0’ the corresponding bit in register PnMDIN (for n = 0,1). To force the Crossbar to skip a Port

pin, set to ‘1’ the corresponding bit in register PnSKIP (for n = 0,1). See Section “14. Port Input/Output”

on page 125 for more Port I/O configuration details.

5.2.

Temperature Sensor

The typical temperature sensor transfer function is shown in Figure 5.2. The output voltage (VTEMP) is the

positive ADC input when the temperature sensor is selected by bits AMX0P4–0 in register AMX0P.

Input Voltage

Right-Justified ADC0H:ADC0L

(AD0LJST = 0)

Left-Justified ADC0H:ADC0L

(AD0LJST = 1)

VREF x 1023/1024

0x03FF

0xFFC0

VREF x 512/1024

0x0200

0x8000

VREF x 256/1024

0x0100

0x4000

0x0000

Input Voltage

Right-Justified ADC0H:ADC0L

(AD0LJST = 0)

Left-Justified ADC0H:ADC0L

(AD0LJST = 1)

VREF x 511/512

0x01FF

0x7FC0

VREF x 256/512

0x0100

0x4000

0x0000

–VREF x 256/512

0xFF00

0xC000

–VREF

0xFE00

0x8000

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