ATA8741-PXQW【PDF 155/238 页】MCU W/TRANSMITTER ASK/FSK 24QFN

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录52

151页 152页 153页 154页 [155页]156页 157页 158页 159页

155

9140CINDCO02/10

ATA8741

Figure 25-1. Analog to Digital Converter Block Schematic

25.3 ADC Operation

The ADC converts an analog input voltage to a 10-bit digital value through successive approxi-

mation. The minimum value represents GND and the maximum value represents the reference

voltage.The voltage reference for the ADC may be selected by writing to the REFS1..0 bits in

ADMUX. The VCC supply, the AREF pin or an internal 1.1V voltage reference may be selected

as the ADC voltage reference.

The analog input channel and differential gain are selected by writing to the MUX5..0 bits in

ADMUX. Any of the eight ADC input pins ADC7..0 can be selected as single ended inputs to the

ADC. For differential measurements all analog inputs next to each other can be selected as a

input pair. Every input is also possible to measure with ADC3. These pairs of differential inputs

are measured by ADC trough the differential gain amplifier.

If differential channels are selected, the differential gain stage amplifies the voltage difference

between the selected input pair by the selected gain factor, 1x or 20x, according to the setting of

ADC CONVERSION

COMPLETE IRQ

8-BIT DATA BUS

ADC MULTIPLEXER

SELECT (ADMUX)

ADC CTRL. & STATUS A

ADC DATA REGISTER

(ADCH/ADCL)

CONVERSION LOGIC

10-BIT DAC

SAMPLE & HOLD

COMPARATOR

INTERNAL

REFERENCE

1.1V

MUX DECODER

DC7

DC6

DC5

DC4

ADC MULTIPLEXER

OUTPUT

PRESCALER

TRIGGER

SELECT

ADTS2...ADTS0

INTERRUPT

FLAGS

START

GAIN

AMPLIFIER

NEG.

INPUT

MUX

SINGLE ENDED / DIFFERENTIAL SELECTION

TEMPERATURE

SENSOR

ADC8

BIN

IPR

DC3

DC2

DC1

DC0

POS.

INPUT

MUX

AGND

ADC CTRL. & STATUS B

AREF

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式