ST7263BEx datasheet(125/186 Pages) STMICROELECTRONICS

部件名	ST7263BEx

功能描述	Low speed USB 8-bit MCU family with up to 32 KB Flash/ROM, DFU capability, 8-bit ADC, WDG, timer, SCI and I²C

PDF	186 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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125 / 186 page

ST7263Bxx

On-chip peripherals

Doc ID 7516 Rev 8

125/186

11.6

8-bit A/D converter (ADC)

11.6.1

Introduction

The on-chip Analog to Digital Converter (ADC) peripheral is a 8-bit, successive

approximation converter with internal sample and hold circuitry. This peripheral has up to 16

multiplexed analog input channels (refer to device pin out description) that allow the

peripheral to convert the analog voltage levels from up to 16 different sources.

The result of the conversion is stored in a 8-bit Data register. The A/D converter is controlled

through a Control/Status register.

11.6.2

Main features

●

8-bit conversion

●

Up to 12 channels with multiplexed input

●

Linear successive approximation

●

Data register (DR) which contains the results

●

Conversion complete status flag

●

On/off bit (to reduce consumption)

The block diagram is shown in Figure 50.

11.6.3

Functional description

Analog power supply

VDDA and VSSA are the high and low level reference voltage pins. In some devices (refer to

device pin out description) they are internally connected to the VDD and VSS pins.

Conversion accuracy may therefore be impacted by voltage drops and noise in the event of

heavily loaded or badly decoupled power supply lines.

See electrical characteristics section for more details.

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