參數(shù)資料
型號: ATTINY15L-1PU
廠商: Atmel
文件頁數(shù): 39/85頁
文件大?。?/td> 0K
描述: IC MCU AVR 1K FLASH 1.6MHZ 8-DIP
標(biāo)準(zhǔn)包裝: 50
系列: AVR® ATtiny
核心處理器: AVR
芯體尺寸: 8-位
速度: 1.6MHz
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 6
程序存儲器容量: 1KB(512 x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 64 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 8-DIP(0.300",7.62mm)
包裝: 管件
44
ATtiny15L
1187H–AVR–09/07
the ADC is switched on by setting the ADEN bit in ADCSR. The prescaler keeps running
for as long as the ADEN bit is set, and is continuously reset when ADEN is low.
When initiating a conversion by setting the ADSC bit in ADCSR, the conversion starts at
the following rising edge of the ADC clock cycle. If differential channels are selected, the
conversion will only start at every other rising edge of the ADC clock cycle after ADEN
was set.
A normal conversion takes 13 ADC clock cycles. In certain situations, the ADC needs
more clock cycles to perform initialization and minimize offset errors. These extended
conversions take 25 ADC clock cycles and occur as the first conversion after one of the
following events:
The ADC is switched on (ADEN in ADCSR is set).
The voltage reference source is changed (the REFS1..0 bits in ADMUX change
value).
A differential channel is selected (MUX2 in ADMUX is “1”). Note that subsequent
conversions on the same channel are not extended conversions.
The actual sample-and-hold takes place 1.5 ADC clock cycles after the start of a normal
conversion and 13.5 ADC clock cycles after the start of an extended conversion. When
a conversion is complete, the result is written to the ADC Data Registers, and ADIF is
set. In Single Conversion mode, ADSC is cleared simultaneously. The software may
then set ADSC again, and a new conversion will be initiated on the first rising ADC clock
edge. In Free Running mode, a new conversion will be started immediately after the
conversion completes while ADSC remains high. Using Free Running mode and an
ADC clock frequency of 200 kHz gives the lowest conversion time, 65 s, equivalent to
15 kSPS. For a summary of conversion times, see Table 18.
Figure 27. ADC Timing Diagram, First Conversion (Single Conversion Mode)
Sign and MSB of Result
LSB of Result
ADC Clock
ADSC
Sample & Hold
ADIF
ADCH
ADCL
Cycle Number
ADEN
1
212
13
14
15
16
17
18
19
20
21
22
23
24
25
1
2
Extended Conversion
Next
Conversion
3
MUX and REFS
Update
MUX and REFS
Update
Conversion
Complete
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