參數(shù)資料
型號： PIC16F628A
廠商： Microchip Technology Inc.
英文描述： 18-pin Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology(18引腳，基于FLASH的8位CMOS微控制器，使用毫微瓦特技術(shù))
中文描述： 18引腳基于閃存的8位CMOS微控制器與納瓦技術(shù)（18引腳，基于閃存的8位的CMOS微控制器，使用毫微瓦特技術(shù)）
文件頁數(shù)： 70/168頁
文件大?。?/td> 2756K
代理商： PIC16F628A
PIC16F627A/628A/648A
DS40044B-page 68
Preliminary
2004 Microchip Technology Inc.
EXAMPLE 11-1:
VOLTAGE REFERENCE
CONFIGURATION
;4 Inputs Muxed
;to 2 comps.
STATUS,RP0 ;go to Bank 1
0x07
;RA3-RA0 are
TRISA
;outputs
0xA6
;enable V
REF
VRCON
;low range set V
R
<3:0>=6
STATUS,RP0 ;go to Bank 0
DELAY10
;10
μ
s delay
11.2
Voltage Reference Accuracy/Error
The full range of V
SS
to V
DD
cannot be realized due to
the construction of the module. The transistors on the
top and bottom of the resistor ladder network
(Figure 11-1) keep V
REF
from approaching V
SS
or V
DD
.
The Voltage Reference is V
DD
derived and therefore,
the V
REF
output changes with fluctuations in V
DD
. The
tested absolute accuracy of the Voltage Reference can
be found in Table 17-3.
11.3
Operation During Sleep
When the device wakes up from Sleep through an
interrupt or a Watchdog Timer time out, the contents of
the VRCON register are not affected. To minimize
current consumption in Sleep mode, the Voltage
Reference should be disabled.
11.4
Effects of a Reset
A device Reset disables the Voltage Reference by
clearing bit V
REN
(VRCON<7>). This Reset also
disconnects the reference from the RA2 pin by clearing
bit V
ROE
(VRCON<6>) and selects the high voltage
range by clearing bit V
RR
(VRCON<5>). The V
REF
value select bits, VRCON<3:0>, are also cleared.
11.5
Connection Considerations
The
independently of the comparator module. The output of
the reference generator may be connected to the RA2
pin if the TRISA<2> bit is set and the V
ROE
bit,
VRCON<6>, is set. Enabling the Voltage Reference
output onto the RA2 pin with an input signal present will
increase current consumption. Connecting RA2 as a
digital output with V
REF
enabled will also increase
current consumption.
The RA2 pin can be used as a simple D/A output with
limited drive capability. Due to the limited drive
capability, a buffer must be used in conjunction with the
Voltage Reference output for external connections to
V
REF
. Figure 11-2 shows an example buffering
technique.
Voltage
Reference
Module
operates
FIGURE 11-2:
VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
TABLE 11-1:
REGISTERS ASSOCIATED WITH VOLTAGE REFERENCE
MOVLW
MOVWF
BSF
MOVLW
MOVWF
MOVLW
MOVWF
BCF
CALL
0x02
CMCON
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value On
POR
Value On
All Other
Resets
9Fh
VRCON
VREN
VROE
VRR
—
VR3
VR2
VR1
VR0
000- 0000
000- 0000
1Fh
CMCON
C2OUT
C1OUT
C2INV
C1INV
CIS
CM2
CM1
CM0
0000 0000
0000 0000
85h
Legend:
— = Unimplemented, read as ‘0’.
TRISA
TRISA7 TRISA6 TRISA5
TRISA4
TRISA3
TRISA2
TRISA1
TRISA0
1111 1111
1111 1111
Note
1:
R is dependent upon the Voltage Reference Configuration VRCON<3:0> and VRCON<5>.
V
REF
Module
R
(1)
Voltage
Reference
Output
Impedance
RA2
V
REF
Output
+
Opamp
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16F628A-E/ML 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(shí)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
PIC16F628A-E/P 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(shí)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
PIC16F628A-E/SO 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(shí)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
PIC16F628A-E/SS 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(shí)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
PIC16F628A-I/ML 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 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(shí)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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