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参数资料
| 型号： | ST52F513F1B6 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP20 |
| 封装： | PLASTIC, DIP-20 |
| 文件页数： | 65/104页 |
| 文件大小： | 644K |
| 代理商： | ST52F513F1B6 |
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ST52F510/F513/F514
63/104
10 10-BIT A/D CONVERTER
10.1 Introduction
ST52F510/F513/F514 A/D Converter is a 10-bit
analog to digital converter with up to 8 analog
inputs.
The
A/D
converter
offers
a
typical
conversion time of 10
s in fast mode and of 20 s
in slow mode. This period also includes the time of
the integral Sample and Hold circuitry, which
minimizes the need for external components and
allows quick sampling of the signal for the
minimum warping effect and integral conversion
error.
In addition the peripheral performs a calibration
procedure in order to get the maximum precision
allowed in the data of conversion. The calibration
procedure is performed in two phases: the pre-
charging phase and the tuning phase. The pre-
charging process can be executed, after the
peripheral start, to set-up the internal references
and to speed-up the tuning process. The tuning
process
is
carried-out
during
the
channels
conversion.
Note: The user must be take in account both the
pre-charging time and some dummy conversion (at
least 20) for the tuning before starting the data
acquisition. It is recommended to repeat this
procedure at the start-up and after a long time
peripheral stop.
Figure 10.1 A/D Converter Structure
The pre-charging process starts by starting the
peripheral by setting to 1 the STR bit of the AD_CR
Configuration
Register.
To
speed-up
the
calibration procedure, the pre-charging phase can
be skipped when not necessary (for example when
consecutive single conversions are performed).
The user can disable the pre-charging by setting
the PRECH bit in the AD_CR Configuration
Register.
The A/D peripheral converts the input voltage with
a process of successive approximations using a
fixed clock frequency derived from the 10 MHz
internal oscillator, divided by a factor that depends
on the speed mode: about 1.6 MHz in Fast Mode
and 800 kHz in Slow Mode. The speed mode is
chosen by the SCK bit of the AD_CR Configuration
Register.
The conversion range is found between the analog
VSS and the A/D VREF references. The VREF can
be either internal, derived from the VDD, or external
by using the VREF pin. The external reference
voltage allows the application of more precise and
stable reference voltages. The two modes are
selected by using the REF bit of the AD_CR
Configuration Register.
Remark: the voltage applied to the VREF pin must
be in the range VSS-VDD.
The external reference voltage VREF is applied to
the analog pin PB0. This pin shares the alternate
functions with the first analog channel Ain0: if the
CON FIGURA TION REG ISTERS
CON TROL
LOGIC
ANALOG
MUX
Ain0
Ain1
Ain2
Ain3
Ain4
Ain5
Ain6
Ain7
VREF
VDD
AUTO-ZERO /
AUTO-C ALIBRATION
CO MPARATOR
SUCCESSIVE
APPROXIMATION
REG ISTER
SAMPLE
&
HOLD
DAC
RESISTIVE
REFERENCE
LADDER
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
STATUS REGISTER
INPUT REGISTERS
V
REF
SUCCES SIVE APPROXIMATION A/D CO NVERTER
INT1
REF
CH0
CH1
CH2
:6
:12
Internal
Os cillator
10 MHz
A/D
clock
S CK
SEQ
POW
STR
CONT
INT0
RESO L
PREC H
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST52F513FMB6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| ST52F513FMM6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| ST52F513GMB6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| ST52F513GMM6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Two Timer/PWMs, ADC, I2C, SPI, SCI |
| ST52F513Y3M6 | 制造商:STMicroelectronics 功能描述: |
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