參數(shù)資料
型號： C8051F220
廠商： Silicon Laboratories Inc
文件頁數(shù)： 74/146頁
文件大?。?/td> 0K
描述： IC 8051 MCU 8K FLASH 48TQFP
標(biāo)準(zhǔn)包裝： 250
系列： C8051F2xx
核心處理器： 8051
芯體尺寸： 8-位
速度： 25MHz
連通性： SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 8KB（8K x 8）
程序存儲器類型： 閃存
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 32x8b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 48-TQFP
包裝： 托盤
C8051F2xx
Rev. 1.6
33
5.2.
ADC Modes of Operation
The ADC has a maximum conversion speed of 100ksps. The ADC conversion clock is derived from the
system clock. The ADC conversion clock is derived from a divided version of SYSCLK. Divide ratios of
1,2,4,8, or 16 are supported by setting the ADCSC bits in the ADC0CF Register. This is useful to adjust
conversion speed to accommodate different system clock speeds.
A conversion can be initiated in one of two ways, depending on the programmed states of the ADC Start of
Conversion Mode bits (ADSTM1, ADSTM0) in ADC0CN. Conversions may be initiated by:
1.
Writing a 1 to the ADBUSY bit of ADC0CN;
2.
A Timer 2 overflow (i.e., timed continuous conversions).
Writing a 1 to ADBUSY provides software control of the ADC whereby conversions are performed "on-
demand". During conversion, the ADBUSY bit is set to 1 and restored to 0 when conversion is complete.
The falling edge of ADBUSY triggers an interrupt (when enabled) and sets the ADCINT interrupt flag in the
ADC0CN register. Note: When conversions are performed "on-demand", the ADCINT flag, not ADBUSY,
should be polled to determine when the conversion has completed. Converted data is available in the ADC
data word register, ADC0H.
The ADCTM bit in register ADC0CN controls the ADC track-and-hold mode. In its default state, the ADC
input is continuously tracked, except when a conversion is in progress. Setting ADCTM to 1 allows one of
two different low power track-and-hold modes to be specified by states of the ADSTM1-0 bits (also in
ADC0CN):
1.
Tracking begins with a write of 1 to ADBUSY and lasts for 3 SAR clocks;
2.
Tracking starts with an overflow of Timer 2 and lasts for 3 SAR clocks.
Tracking can be disabled (shutdown) when the entire chip is in low power standby or sleep modes.
Figure 5.2. 12-Bit ADC Track and Conversion Example Timing
12
34567
89
10 11 12 13 14 15 16
CNVSTR
(ADSTM[1:0]=10)
ADCTM=1
Track
Convert
Low Power Mode
ADCTM=0
Track Or Convert
Convert
Track
Low Power or
Convert
Timer2, Timer3 Overflow;
Write 1 to ADBUSY
(ADSTM[1:0]=00, 01, 11)
ADCTM=1
Track
Convert
Low Power Mode
ADCTM=0
Track or Convert
Convert
Track
Low Power or
Convert
A. ADC Timing for External Trigger Source
B. ADC Timing for Internal Trigger Sources
SAR Clocks
1
23456
789
10 11 12 13 14 15 16 17 18 19
1
23456
789
10 11 12 13 14 15 16
SAR Clocks
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
C8051F220-GQ 功能描述:8位微控制器 -MCU 8KB 8ADC 48P MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
C8051F220-GQR 功能描述:8位微控制器 -MCU 8KB 8ADC 48Pin MCU Tape and Reel RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
C8051F220R 功能描述:8位微控制器 -MCU T-8 48 Pin RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
C8051F221 功能描述:8位微控制器 -MCU 8KB 8ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
C8051F221-GQ 功能描述:8位微控制器 -MCU 8KB 8ADC 32P MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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