STV3550 datasheet(94/144 Pages) STMICROELECTRONICS

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STV3550

7.6

Analog to Digital Converter

7.6.1

Introduction

The on-chip Analog-to-Digital Converter (ADC) peripheral is a successive approximation converter

used to convert analog voltage levels from up to 6 different sources at low frequency. When the

requested conversion is completed, the result is stored in one of the eight 10-bit data registers and

an End of Conversion interrupt is generated, if enabled by software. Another interrupt (Analog

Watchdog) may be generated if the result of the conversion is higher or lower than a programmable

reference level.

7.6.2

Main Features

●

10-bit resolution with a guaranteed accuracy of 6 bits

●

Up to 6 selectable analog inputs

●

Single conversion time: 4.75 µs @ fADC = 3.4 MHz (27/8 MHz ).

●

Single / Continuous / Scan conversion modes

●

External source trigger

●

Analog watchdog on 2 threshold levels

●

One interrupt for End of Conversion event or Analog Watchdog event.

7.6.3

General Description

The ADC can be used to convert the analog signals from a single input channel in 1-Channel mode

or from up to six input channels in Scan mode.

Figure 59: A/D Converter Diagram

Compare Result Register

10-bit Upper Threshold Register

10-bit Lower Threshold Register

Control Logic Register

AD[0]

AD[1]

AD[2]

AD[3]

AD[4]

AD[5]

fADC

Eight 10-bit Data Registers

Ext. Trigger

Analog Watchdog Interrupt

End of Conversion Interrupt

Channel Configuration Register

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