參數(shù)資料
型號： ST7PLITE09Y0U6TR
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20
封裝： QFN-20
文件頁數(shù)： 92/123頁
文件大?。?/td> 2176K
代理商： ST7PLITE09Y0U6TR
ST7LITE0x, ST7LITESx
70/123
11.4 8-BIT A/D CONVERTER (ADC)
11.4.1 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 5 multiplexed analog input
channels (refer to device pin out description) that
allow the peripheral to convert the analog voltage
levels from up to 5 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.
11.4.2 Main Features
■ 8-bit conversion
■ Up to 5 channels with multiplexed input
■ Linear successive approximation
■ Dual input range
–0 to VDD or
– 0V to 250mV
■ Data register (DR) which contains the results
■ Conversion complete status flag
■ On/off bit (to reduce consumption)
■ Fixed
gain operational amplifier (x8) (not
available on ST7LITES5 devices)
11.4.3 Functional Description
11.4.3.1 Analog Power Supply
The block diagram is shown in Figure 44.
VDD and VSS are the high and low level reference
voltage pins.
Conversion accuracy may therefore be impacted
by voltage drops and noise in the event of heavily
loaded or badly decoupled power supply lines.
For more details, refer to the Electrical character-
istics section.
11.4.3.2 Input Voltage Amplifier
The input voltage can be amplified by a factor of 8
by enabling the AMPSEL bit in the ADAMP regis-
ter.
When the amplifier is enabled, the input range is
0V to 250 mV.
For example, if VDD = 5V, then the ADC can con-
vert voltages in the range 0V to 250mV with an
ideal resolution of 2.4mV (equivalent to 11-bit res-
olution with reference to a VSS to VDD range).
For more details, refer to the Electrical character-
istics section.
Note: The amplifier is switched on by the ADON
bit in the ADCCSR register, so no additional start-
up time is required when the amplifier is selected
by the AMPSEL bit.
1
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