參數資料
型號： PIC16F785
廠商： Microchip Technology Inc.
英文描述： 20-Pin Flash-Based 8-Bit CMOS Microcontroller with Two-Phase Asychronous Feedback PWM, Dual High-Speed Comparators and Dual Operational Amplifiers
中文描述： 20引腳基于閃存的8兩相異步反饋的PWM，雙高位CMOS微控制器的高速比較器和雙運算放大器
文件頁數： 71/178頁
文件大小： 1620K
代理商： PIC16F785
2004 Microchip Technology Inc.
Preliminary
DS41249A-page 69
PIC16F785
10.0
VOLTAGE REFERENCES
There are two voltage references available in the
PIC16F785: The voltage referred to as the comparator
reference (CV
REF
) is a variable voltage based on V
DD
;
The voltage referred to as the VR reference (VR) is a
fixed voltage derived from a stable bandgap source.
Each source may be individually routed internally to the
comparators or output, buffered or unbuffered, on the
RA1/AN1/C12IN0-/V
REF
/ICSPCLK pin.
10.1
Comparator Reference
The comparator module also allows the selection of an
internally generated voltage reference for one of the
comparator inputs. The VRCON register
(Register 10-1) controls the voltage reference module
shown in Figure 10-1.
10.1.1
CONFIGURING THE VOLTAGE
REFERENCE
The voltage reference can output 32 distinct voltage
levels, 16 in a high range and 16 in a low range.
The following equation determines the output voltages:
EQUATION 10-1:
VRR =
1
(low range):
CV
REF
= VR<3:0>
X
V
DD
/24
VRR =
0
(high range):
CV
REF
= (V
DD
/4) + (VR<3:0>
X
V
DD
/32)
10.1.2
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 10-1) keep CV
REF
from approaching V
SS
or
V
DD
. The exception is when the module is disabled by
clearing all CVROE, C1VREN and C2VREN bits.
When disabled, the reference voltage is V
SS
when
VR<3:0> is ‘
0000
’ and the VRR (VRCON<5>) bit is
set. This allows the comparators to detect a zero-
crossing and not consume CV
REF
module current.
The voltage reference is V
DD
derived and therefore, the
CV
REF
output changes with fluctuations in V
DD
. The
tested absolute accuracy of the comparator voltage ref-
erence can be found in Table 18-8.
FIGURE 10-1:
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
VRR
8R
VR3:VR0
16-1 Analog
MUX
8R
R
R
R
R
C1V
REF
to
Comparator 1
16 Stages
Input
CVREN
(1)
V
DD
0
1
C2V
REF
to
Comparator 2
Input
0
1
VR
1.2 V
C2VREN
C1VREN
CV
REF
CVROE
Note
1:
See Register 10-1, Bits 3-0.
15
0
·
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相關代理商/技術參數
參數描述
PIC16F785-E/ML 功能描述:8位微控制器 -MCU 3.5 KB 128 RAM 18I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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
PIC16F785-E/P 功能描述:8位微控制器 -MCU 14KB 368 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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
PIC16F785-E/SO 功能描述:8位微控制器 -MCU 3.5KB FL 128R 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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
PIC16F785-E/SS 功能描述:8位微控制器 -MCU 3.5KB FL 128R 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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
PIC16F785-I/ML 功能描述:8位微控制器 -MCU 3.5 KB 128 RAM 18I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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
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