參數(shù)資料
型號(hào): C8051F015R
廠商: Silicon Laboratories Inc
文件頁數(shù): 5/171頁
文件大?。?/td> 0K
描述: IC 8051 MCU 32K FLASH 64TQFP
標(biāo)準(zhǔn)包裝: 1
系列: C8051F01x
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SMBus(2 線/I²C),SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,溫度傳感器,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 2.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b; D/A 2x12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-TQFP
包裝: 剪切帶 (CT)
其它名稱: 336-1030-1
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
14.1.
External Crystal Example
If a crystal or ceramic resonator were used to generate the system clock for the MCU, the circuit would be as shown
in Figure 14.1, Option 1. For an ECS-110.5-20-4 crystal, the resonate frequency is 11.0592MHz, the intrinsic
capacitance is 7pF, and the ESR is 60
. The compensation capacitors should be 33pF each, and the PWB parasitic
capacitance is estimated to be 2pF. The appropriate External Oscillator Frequency Control value (XFCN) from the
Crystal column in the table in Figure 14.3 (OSCXCN Register) should be 111b.
Because the oscillator detect circuitry needs time to settle after the crystal oscillator is enabled, software should wait
at least 1ms between enabling the crystal oscillator and polling the XTLVLD bit. The recommend procedure is:
1. Enable the external oscillator
2. Wait at least 1 ms
3. Poll for XTLVLD '0' ==> '1'
4. Switch to the external oscillator
Switching to the external oscillator before the crystal oscillator has stabilized could result in unpredictable behavior.
NOTE: Crystal oscillator circuits are quite sensitive to PCB layout. The crystal should be placed as close as possible
to the XTAL pins on the device, keeping the traces as short as possible and shielded with ground plane from any
other traces which could introduce noise or interference.
14.2.
External RC Example
If an external RC network were used to generate the system clock for the MCU, the circuit would be as shown in
Figure 14.1, Option 2. The capacitor must be no greater than 100pF, but using a very small capacitor will increase
the frequency drift due to the PWB parasitic capacitance. To determine the required External Oscillator Frequency
Control value (XFCN) in the OSCXCN Register, first select the RC network value to produce the desired frequency
of oscillation. If the frequency desired is 100kHz, let R = 246k
and C = 50pF:
f = 1.23(10
3)/RC = 1.23(103) / [246 * 50] = 0.1MHz = 100kHz
XFCN
log
2 (f/25kHz)
XFCN
log
2 (100kHz/25kHz) = log 2 (4)
XFCN
2, or code 010
14.3.
External Capacitor Example
If an external capacitor were used to generate the system clock for the MCU, the circuit would be as shown in
Figure 14.1, Option 3. The capacitor must be no greater than 100pF, but using a very small capacitor will increase
the frequency inaccuracy due to the PWB parasitic capacitance. To determine the required External Oscillator
Frequency Control value (XFCN) in the OSCXCN Register, select the capacitor to be used and find the frequency
of oscillation from the equations below. Assume AV+ = 3.0V and C = 50pF:
f = KF / (C * VDD) = KF / (50 * 3)
f = KF / 150
If a frequency of roughly 90kHz is desired, select the K Factor from the table in Figure 14.3 as KF = 13:
f = 13 /150 = 0.087MHz, or 87kHz
Therefore, the XFCN value to use in this example is 011.
Rev. 1.7
102
相關(guān)PDF資料
PDF描述
C8051F017R IC 8051 MCU 32K FLASH 32LQFP
C8051F007R IC 8051 MCU 32K FLASH 32LQFP
C8051F221R IC 8051 MCU 8K FLASH 32LQFP
C8051F220R IC 8051 MCU 8K FLASH 48TQFP
C8051F012R IC 8051 MCU 32K FLASH 32LQFP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
C8051F015TB 功能描述:開發(fā)板和工具包 - 8051 USE 634-C8051F005TB RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評(píng)估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓:
C8051F015-TB 功能描述:BOARD PROTOTYPING W/C8051F015 RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 過時(shí)/停產(chǎn)零件編號(hào) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:MCU 適用于相關(guān)產(chǎn)品:Freescale MC68HC908LJ/LK(80-QFP ZIF 插口) 所含物品:面板、纜線、軟件、數(shù)據(jù)表和用戶手冊(cè) 其它名稱:520-1035
C8051F016 功能描述:8位微控制器 -MCU 32KB 10ADC 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
C8051F016-GQ 功能描述:8位微控制器 -MCU 32KB 10ADC 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
C8051F016-GQR 功能描述:8位微控制器 -MCU 32KB 10ADC 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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