ST7LITE49M datasheet(129/188 Pages) STMICROELECTRONICS

部件名	ST7LITE49M

功能描述	8-bit MCU with single voltage Flash memory data EEPROM, ADC, 8/12-bit timers, and I²C interface

PDF	188 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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129 / 188 page

ST7LITE49M

On-chip peripherals

129/188

Figure 59.

ADC block diagram

Digital A/D conversion result

The conversion is monotonic, meaning that the result never decreases if the analog input

does not and never increases if the analog input does not.

If the input voltage (VAIN) is greater than VDDA (high-level voltage reference) then the

conversion result is FFh in the ADCDRH register and 03h in the ADCDRL register (without

overflow indication).

If the input voltage (VAIN) is lower than VSSA (low-level voltage reference) then the

conversion result in the ADCDRH and ADCDRL registers is 00 00h.

The A/D converter is linear and the digital result of the conversion is stored in the ADCDRH

and ADCDRL registers. The accuracy of the conversion is described in the Electrical

Characteristics Section.

RAIN is the maximum recommended impedance for an analog input signal. If the impedance

is too high, this will result in a loss of accuracy due to leakage and sampling not being

completed in the alloted time.

CH2

CH1

EOC SPEED ADON

CH0

ADCCSR

AIN0

AIN1

ANALOG TO DIGITAL

CONVERTER

AIN6

ANALOG

MUX

ADCDRH

ADCDRL

SLOW

CH3

RADC

CADC

HOLD CONTROL

fADC

fCPU

DIV 2

DIV 4

SLOW

bit

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