参数资料
型号: C8051F018
厂商: Silicon Laboratories Inc
文件页数: 92/154页
文件大小: 0K
描述: IC 8051 MCU 16K FLASH 64TQFP
标准包装: 160
系列: C8051F018
核心处理器: 8051
芯体尺寸: 8-位
速度: 25MHz
连通性: SMBus(2 线/I²C),SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,温度传感器,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.8 V ~ 3.6 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-TQFP
包装: 托盘
C8051F018
C8051F019
7.
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 200
A to AGND (see Figure 7.1).
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 7.2), provides the means to enable or disable
the bandgap and buffer amplifier. The BIASE bit in REF0CN enables the bias circuitry for the ADC 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 1
A (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 the ADC is not 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 7.1.
The temperature sensor connects to the highest order input of the A/D converter’s input multiplexer. 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 7.1. Voltage Reference Functional Block Diagram
Bias
Generator
(to ADC)
VREF
EN
(to Analog Mux)
RLOAD
AGND
External Equivalent
Load Circuit
AGND
R1
AV+
External
Voltage
Reference
Circuit
Temp
Sensor
EN
200uA
(max)
(Bias to ADC)
REF
0
CN
TEMPE
BIASE
REFBE
2.4V
Reference
EN
AGND
Rev. 1.2
42
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