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ST72P63BE1M1 Datasheet(PDF) 98 Page - STMicroelectronics

Part No. ST72P63BE1M1
Description  Low speed USB 8-bit MCU family with up to 32K Flash/ROM, DFU capability, 8-bit ADC, WDG, timer, SCI & I²C
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST72P63BE1M1 Datasheet(HTML) 98 Page - STMicroelectronics

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12.6 8-bit A/D converter (ADC)
12.6.1 Introduction
The on-chip Analog to Digital Converter (ADC) pe-
ripheral is a 8-bit, successive approximation con-
verter 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.
12.6.2 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 47.
12.6.3 Functional description
12.6.3.1 Analog power supply
VDDA and VSSA are the high and low level refer-
ence 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 de-
tails.
Figure 47. ADC block diagram
CH2
CH1
CH3
COCO
0
ADON
0
CH0
ADCCSR
AIN0
AIN1
ANALOG TO DIGITAL
CONVERTER
AINx
ANALOG
MUX
RADC
CADC
D2
D1
D3
D7
D6
D5
D4
D0
ADCDR
4
DIV 4
fADC
fCPU
HOLD CONTROL


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