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HT56RB688 데이터시트(PDF) 62 Page - Holtek Semiconductor Inc

부품명 HT56RB688
상세설명  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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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 device contains an 8-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.
Input Channels
Conversion Bits
Input Pins
8
12
PA0~PA7
The accompanying block diagram shows the overall internal structure of the A/D converter, together
with its associated registers.
A/D Converter Data Registers - ADRL, ADRH
The device, which has an internal 12-bit A/D converter, requires two data registers, a high byte
register, known as ADRH, and a low byte register, known as ADRL. After the conversion process
takes place, these registers can be directly read by the microcontroller to obtain the digitised
conversion value. Only the high byte register, ADRH, utilises its full 8-bit contents. The low byte
register utilises only 4 bit of its 8-bit contents as it contains only the lowest bits of the 12-bit converted
value.
In the following table, D0~D11 is the A/D conversion data result bits.
Register
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
ADRL
D3
D2
D1
D0
¾¾¾¾
ADRH
D11
D10
D9
D8
D7
D6
D5
D4
A/D Data Registers
Rev. 1.10
62
April 15, 2013
HT56RB688
TinyPowerTM A/D type Smart Card OTP MCU
with LCD, DAC, ISO 7816 and USB Interfaces
A / D C o n v e r t e r
P A 0 / A N 0
P A 1 / A N 1
P A 7 / A N 7
A / D R e f e r e n c e V o l t a g e
A D R L
A D R H
A / D D a t a
R e g i s t e r s
V B G E N
S T A R T
E O C B
A D O N B
V S S
P A 7 / A N 7 / V R E F
A D C S 2 ~ A D C S 0
f S Y S
P C R 7 ~ P C R 0
A C S 4 ,
A C S 2 ~ A C S 0
1 . 2 5 V
A / D C l o c k
V D D
A D O N B
B i t
V R E F S
B i t
¸ 2 N
( N = 0 ~ 5 )
A/D Converter Structure


유사한 부품 번호 - HT56RB688_13

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