參數(shù)資料
型號： PIC16C622T-20I/SO
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDSO18
封裝： 0.300 INCH, PLASTIC, MS-013, SO-18
文件頁數(shù)： 69/128頁
文件大小： 3677K
代理商： PIC16C622T-20I/SO
2003 Microchip Technology Inc.
DS30235J-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 V
REF 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 Register 8-1. The block diagram
is given in Figure 8-1.
8.1
Configuring 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 V
RR = 1: VREF = (VR<3:0>/24) x VDD
if V
RR = 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 V
REF output (Table 12-1).
Example 8-1 shows an example of how to configure the
Voltage Reference for an output voltage of 1.25V with V
DD
= 5.0V.
REGISTER 8-1:
VRCON REGISTER(ADDRESS 9Fh)
FIGURE 8-1:
VOLTAGE REFERENCE BLOCK DIAGRAM
R/W-0
U-0
R/W-0
V
REN
V
ROE
V
RR
—V
R3VR2VR1VR0
bit 7
bit 0
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
= V
REF 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
V
R<3:0>: VREF value selection 0
≤ VR [3:0] ≤ 15
when VRR = 1: VREF = (VR<3:0>/ 24) * V
DD
when VRR = 0: VREF = 1/4 * V
DD + (VR<3:0>/ 32) * VDD
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
’1’ = Bit is set
’0’ = Bit is cleared
x = Bit is unknown
Note:
R is defined in Table 12-2.
V
RR
8R
V
R3
V
R0
(From VRCON<3:0>)
16-1 Analog Mux
8R
R
V
REN
V
REF
16 Stages
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PIC16C62A-04/SO 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O 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
PIC16C62A-04/SP 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O 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
PIC16C62A-04/SS 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O 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
PIC16C62A-04E/SO 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O 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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