BC66F840 Datasheet, PDF (133/242 Pages) Holtek Semiconductor Inc – 2.4GHz Flash RF TX/RX MCU

BC66F840/BC66F850/BC66F860
2.4GHz Flash RF TX/RX MCU
Analog to Digital Converter
The need to interface to real world analog signals is a common requirement for many electronic
systems. However, to properly process these signals by a microcontroller, they must first be
converted into digital signals by A/D converters. By integrating the A/D conversion electronic
circuitry into the microcontroller, the need for external components is reduced significantly with the
corresponding follow-on benefits of lower costs and reduced component space requirements.
A/D Overview
The devices contain a multi-channel analog to digital converter which can directly interface to
external analog signals, such as that from sensors or other control signals and convert these signals
directly into either a 12-bit digital value.
Part No.
BC66F840
BC66F850/
BC66F860
Input Channels A/D Channel Select Bits
8
ACS4, ACS2~ACS0
16
ACS4~ACS0
Input Pins
AN0~AN7
AN0~AN15
The accompanying block diagram shows the overall internal structure of the A/D converter, together
with its associated registers.
fSYS
VDD
ACE15~ACE0
AN15
AN14
...
AN1
AN0
V_BG
VBGEN
ADCK�~ADCK0
�^N
(N=0~6)
ADOFF
A/D Clock ^Bit
PB3/VREF
VREFS
Bit
A/D Converter
A/D Reference Voltage
ADRL
ADRH
A/D Data
Registers
VSS
ACS4�
ACS3~ACS0
START EOCB ADOFF
A/D Converter Structure
ADRFS
bit
Rev. 1.40
133
May 24, 2017