參數(shù)資料
型號： PIC16C715
廠商： Microchip Technology Inc.
英文描述： 8-Bit CMOS Microcontroller with A/D Converter(每個I/O口有25mA驅動/吸收電流，微控制器)
中文描述： 8位CMOS微控制器與A / D轉換器（每個的I / O口有25毫安驅動/吸收電流，微控制器）
文件頁數(shù)： 41/120頁
文件大小： 764K
代理商： PIC16C715
1996 Microchip Technology Inc.
Advance Information
DS30560A-page 41
PIC16C715
7.4.1
FASTER CONVERSION - LOWER
RESOLUTION TRADE-OFF
Not all applications require a result with 8-bits of reso-
lution, but may instead require a faster conversion
time. The A/D module allows users to make the trade-
off of conversion speed to resolution. Regardless of the
resolution required, the acquisition time is the same. To
speed up the conversion, the clock source of the A/D
module may be switched so that the T
AD
time violates
the minimum specified time (see the applicable electri-
cal specification). Once the T
AD
time violates the mini-
mum specified time, all the following A/D result bits are
not valid (see A/D Conversion Timing in the Electrical
Specifications section.) The clock sources may only be
switched between the three oscillator versions (cannot
be switched from/to RC). The equation to determine
the time before the oscillator can be switched is as fol-
lows:
Conversion time = 2T
AD
+ N T
AD
+ (8 - N)(2T
OSC
)
Where: N = number of bits of resolution required.
Since the T
AD
is based from the device oscillator, the
user must use some method (a timer, software loop,
etc.) to determine when the A/D oscillator may be
changed. Example 7-3 shows a comparison of time
required for a conversion with 4-bits of resolution, ver-
sus the 8-bit resolution conversion. The example is for
devices operating at 20 MHz and 16 MHz (The A/D
clock is programmed for 32T
OSC
), and assumes that
immediately after 6T
AD
, the A/D clock is programmed
for 2T
OSC
.
The 2T
OSC
violates the minimum T
AD
time since the
last 4-bits will not be converted to correct values.
EXAMPLE 7-3:
4-BIT vs. 8-BIT CONVERSION TIMES
Freq. (MHz)
(1)
Resolution
4-bit
1.6
μ
s
2.0
μ
s
50 ns
62.5 ns
10
μ
s
12.5
μ
s
8-bit
1.6
μ
s
2.0
μ
s
50 ns
62.5 ns
16
μ
s
20
μ
s
T
AD
20
16
20
16
20
16
T
OSC
2T
AD
+ N T
AD
+ (8 - N)(2T
OSC
)
Note 1: The PIC16C715 has a minimum T
AD
time of 1.6
μ
s.
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相關代理商/技術參數(shù)
參數(shù)描述
PIC16C715/JW 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 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
PIC16C715-04/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 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
PIC16C715-04/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C715 DIP18
PIC16C715-04/P 制造商:Microchip Technology Inc 功能描述:Microcontroller IC Number of I/Os:13
PIC16C715-04/SO 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 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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