參數(shù)資料
型號： PIC16LC715
廠商： Microchip Technology Inc.
英文描述： 8-Bit CMOS Microcontrollers with A/D Converter
中文描述： 8位CMOS微控制器與A / D轉換器
文件頁數(shù)： 41/176頁
文件大?。?/td> 803K
代理商： PIC16LC715
1997 Microchip Technology Inc.
DS30272A-page 41
PIC16C71X
7.2
The A/D conversion time per bit is defined as T
AD
. The
A/D conversion requires 9.5T
AD
per 8-bit conversion.
The source of the A/D conversion clock is software
selectable. The four possible options for T
AD
are:
2T
OSC
8T
OSC
32T
OSC
Internal RC oscillator
For correct A/D conversions, the A/D conversion clock
(T
AD
) must be selected to ensure a minimum T
AD
time
of:
2.0
μ
s for the PIC16C71
1.6
μ
s for all other PIC16C71X devices
Table 7-1 and Table 7-2 and show the resultant T
AD
times derived from the device operating frequencies
and the A/D clock source selected.
Selecting the A/D Conversion Clock
7.3
The ADCON1 and TRISA registers control the opera-
tion of the A/D port pins. The port pins that are desired
as analog inputs must have their corresponding TRIS
bits set (input). If the TRIS bit is cleared (output), the
digital output level (V
OH
or V
OL
) will be converted.
The A/D operation is independent of the state of the
CHS2:CHS0 bits and the TRIS bits.
Configuring Analog Port Pins
Note 1:
When reading the port register, all pins
configured as analog input channels will
read as cleared (a low level). Pins config-
ured as digital inputs, will convert an ana-
log input. Analog levels on a digitally
configured input will not affect the conver-
sion accuracy.
Note 2:
Analog levels on any pin that is defined as
a digital input (including the AN7:AN0
pins), may cause the input buffer to con-
sume current that is out of the devices
specification.
TABLE 7-1:
T
AD
vs. DEVICE OPERATING FREQUENCIES, PIC16C71
TABLE 7-2:
T
AD
vs. DEVICE OPERATING FREQUENCIES, PIC16C710/711, PIC16C715
AD Clock Source (T
AD
)
Device Frequency
Operation
2T
OSC
8T
OSC
32T
OSC
RC
(5)
Legend: Shaded cells are outside of recommended range.
Note 1: The RC source has a typical T
AD
time of 4
μ
s.
2: These values violate the minimum required T
AD
time.
3: For faster conversion times, the selection of another clock source is recommended.
4: When device frequency is greater than 1 MHz, the RC A/D conversion clock source is recommended for
sleep operation only.
5: For extended voltage devices (LC), please refer to Electrical Specifications section.
ADCS1:ADCS0
20 MHz
100 ns
(2)
400 ns
(2)
1.6
μ
s
(2)
2 - 6
μ
s
(1,4)
16 MHz
125 ns
(2)
500 ns
(2)
2.0
μ
s
2 - 6
μ
s
(1,4)
4 MHz
500 ns
(2)
2.0
μ
s
8.0
μ
s
2 - 6
μ
s
(1,4)
1 MHz
2.0
μ
s
8.0
μ
s
32.0
μ
s
(3)
2 - 6
μ
s
(1)
333.33 kHz
6
μ
s
24
μ
s
(3)
96
μ
s
(3)
2 - 6
μ
s
(1)
00
01
10
11
AD Clock Source (T
AD
)
Device Frequency
Operation
2T
OSC
8T
OSC
32T
OSC
RC
(5)
Legend: Shaded cells are outside of recommended range.
Note 1: The RC source has a typical T
AD
time of 4
μ
s.
2: These values violate the minimum required T
AD
time.
3: For faster conversion times, the selection of another clock source is recommended.
4: When device frequency is greater than 1 MHz, the RC A/D conversion clock source is recommended for
sleep operation only.
5: For extended voltage devices (LC), please refer to Electrical Specifications section.
ADCS1:ADCS0
20 MHz
100 ns
(2)
400 ns
(2)
1.6
μ
s
2 - 6
μ
s
(1,4)
5 MHz
400 ns
(2)
1.6
μ
s
6.4
μ
s
2 - 6
μ
s
(1,4)
1.25 MHz
1.6
μ
s
6.4
μ
s
25.6
μ
s
(3)
2 - 6
μ
s
(1,4)
333.33 kHz
6
μ
s
24
μ
s
(3)
96
μ
s
(3)
2 - 6
μ
s
(1)
00
01
10
11
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參數(shù)描述
PIC16LC715-04/P 功能描述:8位微控制器 -MCU 3.5KB 128 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
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PIC16LC715-04/SOG 制造商:Microchip Technology 功能描述:MCU 8-bit PIC16 PIC RISC 3.5KB EPROM 3.3V/5V 18-Pin SOIC W Tube
PIC16LC715-04/SS 功能描述:8位微控制器 -MCU 3.5KB 128 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
PIC16LC715-04E/P 功能描述:8位微控制器 -MCU w/A/D Low Power 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
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