參數(shù)資料
型號(hào): C8051F002
廠商: Cygnal Technologies
英文描述: 20 MIPS,32k Flash,256 Ram,12bit ADC,32 Pin MCU(20 MIPS,32k 閃速存儲(chǔ)器,256 Ram,12位 ADC,32 腳 MCU)
中文描述: 20 MIPS的,32K閃存,256羊,12位ADC,32引腳微控制器(20 MIPS的,32K的閃速存儲(chǔ)器,256,羊,12位ADC和32腳微控制器)
文件頁數(shù): 60/170頁
文件大?。?/td> 1294K
代理商: C8051F002
Page 60
CYGNAL Integrated Products, Inc.
2001
4.2001; Rev. 1.3
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
PRELIMINARY
9. VOLTAGE REFERENCE
The voltage reference circuit consists of a 1.2V, 15ppm/
°
C (typical) bandgap voltage reference generator and a gain-
of-two output buffer amplifier. The reference voltage on VREF can be connected to external devices in the system,
as long as the maximum load seen by the VREF pin is less than 200uA to AGND (see Figure 9.1).
If a different reference voltage is required, an external reference can be connected to the VREF pin and the internal
bandgap and buffer amplifier disabled in software. The external reference voltage must still be less than AV+ -0.3V.
The Reference Control Register, REF0CN (defined in Figure 9.2), provides the means to enable or disable the
bandgap and buffer amplifier. The BIASE bit in REF0CN enables the bias circuitry for the ADC and DACs while
the REFBE bit enables the bandgap reference and buffer amplifier which drive the VREF pin. When disabled, the
supply current drawn by the bandgap and buffer amplifier falls to less than 1uA (typical) and the output of the buffer
amplifier enters a high impedance state. If the internal bandgap is used as the reference voltage generator, BIASE
and REFBE must both be set to 1. If an external reference is used, REFBE must be set to 0 and BIASE must be set
to 1. If neither the ADC nor the DAC are being used, both of these bits can be set to 0 to conserve power. The
electrical specifications for the Voltage Reference are given in Table 9.1.
The temperature sensor connects to the highest order input of the A/D converter’s input multiplexer (see Figure 5.1
and Figure 5.5 for details). The TEMPE bit within REF0CN enables and disables the temperature sensor. While
disabled, the temperature sensor defaults to a high impedance state and any A/D measurements performed on the
sensor while disabled result in meaningless data.
Figure 9.1. Voltage Reference Functional Block Diagram
Bias
Generator
(to ADC
and DAC)
VREF
EN
(to Analog Mux)
RLOAD
AGND
AGND
External Equivalent
Load Circuit
AGND
R1
AV+
External
Voltage
Reference
Circuit
Temp
Sensor
EN
2
(
(Bias to ADC
and DAC)
R
TEMPE
BIASE
REFBE
2.4V
Reference
EN
AGND
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C8051F002-GQ 功能描述:8位微控制器 -MCU 32KB 12ADC 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
C8051F002-GQR 功能描述:8位微控制器 -MCU 32KB 12ADC 32Pin 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
C8051F002R 功能描述:8位微控制器 -MCU C 12Bit 32Pin 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
C8051F005 功能描述:8位微控制器 -MCU 32KB 12ADC 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
C8051F005/0046 制造商:Silicon Laboratories Inc 功能描述: