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参数资料
型号： PIC16C620A-04/P301
元件分类： 微控制器/微处理器
英文描述： 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP18
封装： 0.300 INCH, PLASTIC, DIP-18
文件页数： 47/108页
文件大小： 674K
代理商： PIC16C620A-04/P301
1998 Microchip Technology Inc.
Preliminary
DS30235G-page 43
PIC16C62X
8.0
VOLTAGE REFERENCE
MODULE
The Voltage Reference is a 16-tap resistor ladder
network that provides a selectable voltage reference.
The resistor ladder is segmented to provide two ranges
of VREF values and has a power-down function to
conserve power when the reference is not being used.
The VRCON register controls the operation of the
reference as shown in Figure 8-1. The block diagram is
given in Figure 8-2.
8.1
Conguring the Voltage Reference
The Voltage Reference can output 16 distinct voltage
levels for each range.
The equations used to calculate the output of the
Voltage Reference are as follows:
if VRR = 1: VREF = (VR<3:0>/24) x VDD
if VRR = 0: VREF = (VDD x 1/4) + (VR<3:0>/32) x VDD
The setting time of the Voltage Reference must be
considered
when
changing
the
VREF
output
(Table 12-2). Example 8-1 shows an example of how to
congure the Voltage Reference for an output voltage
of 1.25V with VDD = 5.0V.
FIGURE 8-1:
VRCON REGISTER(ADDRESS 9Fh)
FIGURE 8-2:
VOLTAGE REFERENCE BLOCK DIAGRAM
R/W-0
U-0
R/W-0
VREN
VROE
VRR
—
VR3
VR2
VR1
VR0
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n =Value at POR reset
bit7
bit0
bit 7:
VREN: VREF Enable
1 = VREF circuit powered on
0 = VREF circuit powered down, no IDD drain
bit 6:
VROE: VREF Output Enable
1 = VREF is output on RA2 pin
0 = VREF is disconnected from RA2 pin
bit 5:
VRR: VREF Range selection
1 = Low Range
0 = High Range
bit 4:
Unimplemented: Read as '0'
bit 3-0: VR<3:0>: VREF value selection 0
≤ VR [3:0] ≤ 15
when VRR = 1: VREF = (VR<3:0>/ 24) * VDD
when VRR = 0: VREF = 1/4 * VDD + (VR<3:0>/ 32) * VDD
Note:
R is dened in Table 12-3.
VRR
8R
VR3
VR0
(From VRCON<3:0>)
16-1 Analog Mux
8R
R
VREN
VREF
16 Stages
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相关代理商/技术参数
参数描述
PIC16C620A-20/P 功能描述:8位微控制器 -MCU .875KB 96 RAM 13 I/O 20 MHz PDIP18 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16C620A-20/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C620 DIP18
PIC16C620A-20/SO 功能描述:8位微控制器 -MCU .875KB 96 RAM 13 I/O 20 MHz SOIC18 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16C620A-20/SS 功能描述:8位微控制器 -MCU .875KB 96 RAM 13 I/O 20 MHz SSOP20 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16C620A-20E/P 功能描述:8位微控制器 -MCU .875KB 96 RAM 13 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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