ST7MC1K2-Auto datasheet(297/371 Pages) STMICROELECTRONICS

297 / 371 page

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On-chip peripherals

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10.8

10-bit A/D converter (ADC)

10.8.1

Introduction

The on-chip analog to digital converter (ADC) peripheral is a 10-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 two 8-bit Data Registers. The A/D converter is

controlled through a control/status register.

10.8.2

Main features

●

10-bit conversion

●

Up to 16 channels with multiplexed input

●

2 software-selectable sample times

●

External positive reference voltage VREF+ can be independent from supply

●

Linear successive approximation

●

Data registers (DR) which contain the results

●

Conversion complete status flag

●

Maskable interrupt

●

On/off bit (to reduce consumption)

The block diagram is shown in Figure 128.

10.8.3

Functional description

Analog references

VREF+ and VREF- are the high and low level reference voltage pins. Conversion accuracy

may therefore be impacted by voltage drops and noise on these lines. VREF+ can be

supplied by an intermediate supply between VDDA and VSSA to change the conversion

voltage range. VREF- must be tied to VSSA. An internal resistor bridge is implemented

between VREF+ and VREF- pins, with a typical value of 15kΩ.

3HIGHGAIN

Gain range selection

This bit must be programmed depending on the application. It can be used to

ensure 35dB open loop gain when high, it must be low when the closed loop gain

is below 20dB for stability reasons.

0: Closed loop gain up to 20dB

1: Closed loop gain more than 20dB

2:0

Reserved, must be kept cleared

Table 170.

OACSR register description (continued)

Bit

Name

Function

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