參數(shù)資料
型號: PIC16C620
廠商: Microchip Technology Inc.
英文描述: EPROM-Based 8-Bit CMOS Microcontroller(每個I/O口有25mA驅(qū)動/吸收電流,可編程VREF,2.5V的微控制器)
中文描述: 存儲器為基礎(chǔ)的8位CMOS微控制器(每個的I / O口有25毫安驅(qū)動/吸收電流,可編程參考電壓,為2.5V的微控制器)
文件頁數(shù): 43/112頁
文件大?。?/td> 1205K
代理商: PIC16C620
1997 Microchip Technology Inc.
Preliminary
DS30235F-page 43
PIC16C62X(A)
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 Figure 8-1. The block diagram is
given in Figure 8-2.
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: V
REF
= (V
R
<3:0>/24) x V
DD
if V
RR
= 0: V
REF
= (V
DD
x 1/4) + (V
R
<3:0>/32) x V
DD
The setting time of the Voltage Reference must be
considered
when
changing
(Table 12-2). 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.
the
V
REF
output
FIGURE 8-1:
VRCON REGISTER(ADDRESS 9Fh)
FIGURE 8-2:
VOLTAGE REFERENCE BLOCK DIAGRAM
R/W-0
V
REN
bit7
R/W-0
V
ROE
R/W-0
V
RR
U-0
R/W-0
V
R3
R/W-0
V
R2
R/W-0
V
R1
R/W-0
V
R0
R = Readable bit
W =Writable bit
U = Unimplemented bit,
read as ‘0’
- n =Value at POR reset
bit0
bit 7:
V
REN
:
V
REF
Enable
1 = V
REF
circuit powered on
0 = V
REF
circuit powered down, no I
DD
drain
V
ROE
:
V
REF
Output Enable
1 = V
REF
is output on RA2 pin
0 = V
REF
is disconnected from RA2 pin
V
RR
:
V
REF
Range selection
1 = Low Range
0 = High Range
Unimplemented:
Read as '0'
bit 3-0:
V
R
<3:0>
: V
REF
value selection 0
V
R
[3:0]
15
when V
RR
= 1: V
REF
= (V
R
<3:0>/ 24) * V
DD
when V
RR
= 0: V
REF
= 1/4 * V
DD
+ (V
R
<3:0>/ 32) * V
DD
bit 6:
bit 5:
bit 4:
Note:
R is defined in Table 12-3.
V
RR
8R
V
R
3
V
R
0
(From VRCON<3:0>)
16-1 Analog Mux
8R
R
R
R
R
V
REN
V
REF
16 Stages
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PIC16C620-04/SS 功能描述:8位微控制器 -MCU .875KB 80 RAM 13 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 安裝風格:SMD/SMT