STM8AF6268 Datasheet, PDF(69/89 Page) STMicroelectronics – Automotive 8-bit MCU, with up to 32 Kbytes Flash, data EEPROM, 10-bit ADC, timers, LIN, SPI, I2C, 3 to 5.5 V

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STM8AF6268 Datasheet, PDF (69/89 Pages) STMicroelectronics – Automotive 8-bit MCU, with up to 32 Kbytes Flash, data EEPROM, 10-bit ADC, timers, LIN, SPI, I2C, 3 to 5.5 V

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STM8AF61xx, STM8AF62xx

Electrical characteristics

10.3.11

10-bit ADC characteristics

Subject to general operating conditions for VDDA, fMASTER, and TA unless otherwise

specified.

Table 42. ADC characteristics

Symbol

Parameter

Conditions Min Typ Max Unit

fADC

ADC clock frequency

111 kHz - 4 MHz kHz/MHz

VDDA Analog supply

5.5

VREF+ Positive reference voltage

2.75

VDDA

VREF- Negative reference voltage

VSSA

0.5

VSSA

VDDA

VAIN

Conversion voltage range(1)

Devices with

external VREF+/

VREF- pins

VREF-

VREF+

Csamp Internal sample and hold capacitor

tS(1)

Sampling time

(3 x 1/fADC)

fADC = 2 MHz

fADC = 4 MHz

1.5

0.75 -

tSTAB Wakeup time from standby

fADC = 2 MHz

Âµs

fADC = 4 MHz

3.5

Total conversion time including

fADC = 2 MHz

tCONV

sampling time

(14 x 1/fADC)

fADC = 4 MHz

3.5

Rswitch Equivalent switch resistance

kÎ©

1. During the sample time, the sampling capacitance, Csamp (3 pF typ), can be charged/discharged by the

external source. The internal resistance of the analog source must allow the capacitance to reach its final

voltage level within tS. After the end of the sample time tS, changes of the analog input voltage have no

effect on the conversion result.

Figure 40. Typical application with ADC

VAIN

RAIN

AINx

CAIN

VDD

0.6V

STM8A

Rswitch

10-bit A/D

conversion

Csamp

1. Legend: RAIN = external resistance, CAIN = capacitors, Csamp = internal sample and hold capacitor.

Doc ID 14952 Rev 6

69/89

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