ST7LITE49M Datasheet, PDF (128/188 Pages) STMicroelectronics – 8-bit MCU with single voltage Flash memory data EEPROM, ADC, 8/12-bit timers, and I²C interface

On-chip peripherals
ST7LITE49M
11.5
11.5.1
11.5.2
11.5.3
10-bit A/D converter (ADC)
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 10
multiplexed analog input channels (refer to device pin out description) that allow the
peripheral to convert the analog voltage levels from up to 7 different sources.
The result of the conversion is stored in a 10-bit Data register. The A/D converter is
controlled through a Control/Status register.
Main Features
● 10-bit conversion
● Up to 7 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 59.
Functional description
Analog power supply
V_DDA and V_SSA are the high and low level reference voltage pins. In some devices (refer to
device pin out description) they are internally connected to the V_DD and V_SS pins.
Conversion accuracy may therefore be impacted by voltage drops and noise in the event of
heavily loaded or badly decoupled power supply lines.
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