參數(shù)資料
型號(hào): PIC16C781-I/SO
廠商: Microchip Technology
文件頁(yè)數(shù): 160/186頁(yè)
文件大小: 0K
描述: IC MCU OTP 1KX14 W/AD COMP20SOIC
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 38
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 13
程序存儲(chǔ)器容量: 1.75KB(1K x 14)
程序存儲(chǔ)器類型: OTP
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x8b; D/A 1x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 管件
產(chǎn)品目錄頁(yè)面: 636 (CN2011-ZH PDF)
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
AC164028-ND - MODULE SKT PROMATEII 20SOIC/DIP
其它名稱: PIC16C781I/SO
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2001 Microchip Technology Inc.
Preliminary
DS41171A-page 73
PIC16C781/782
9.2.4
INITIATING A CONVERSION
The Analog-to-Digital conversion is initiated by setting
the GO/DONE bit in ADCON0 register. When the con-
version is complete, the ADC module:
Clears the GO/DONE bit
Sets the ADIF flag in the PIR1 register
Generates an interrupt if the ADIE, PEIE, and GIE
bits are set.
If the conversion must be aborted, the GO/DONE bit
can be cleared in software. The ADRES register will not
be updated with the partially completed ADC conver-
sion sample. Instead, the ADRES will contain the value
from the last completed conversion. After an aborted
conversion, a 2TAD delay is required before another
acquisition/conversion can be initiated. Following the
delay, an input acquisition is automatically started on
the selected channel.
9.3
ADC Acquisition Requirements
For the ADC module to meet its specified accuracy, the
internal Sample-and-Hold capacitor (CHOLD) must be
allowed to charge to within LSb of the voltage present
on the input channel (see analog input model in Figure
9-2). The analog source resistance (RS) and the internal
sampling switch resistance (RSS) will directly affect the
time required to charge CHOLD. In addition, RSS will vary
over the power supply voltage range (AVDD), and RS will
affect the input offset voltage at the analog input (due to
pin leakage current). Therefore:
1.
The maximum recommended impedance for
any analog sources is 10 kOhms.
2.
Following any change in the analog input chan-
nel selection, a minimum acquisition delay must
be observed before another conversion can
begin (see Equation 9-1).
To calculate the minimum acquisition time, Equation 9-1
may be used. This equation calculates the acquisition
time to within LSb error, assuming an 8-bit conver-
sion (512 steps for the PIC16C781/782 ADC). The
LSb error is the maximum error allowed for the ADC to
meet its specified accuracy.
EQUATION 9-1:
ADC MINIMUM
CHARGING TIME
Example 9-1 shows the calculation of the minimum
required acquisition time TACQ. This calculation is
based on the following system assumptions.
CHOLD = 51.2 pF
RS = 10k
1/2 LSb error
RSS = 7k
@ VDD = 5V
EXAMPLE 9-1:
CALCULATING THE
MINIMUM REQUIRED
ACQUISITION TIME
Note:
The GO/DONE bit should NOT be set in
the same instruction that turns on the ADC.
VHOLD = (ADCREF-(ADCREF/512))(1-e
-TCAP/CHOLD(RIC+Rss+Rs))
Given: VHOLD = (ADCREF/512), for 1/2LSb resolution
The above equation reduces to:
TCAP = -(51.2 pF)(1 k
+ RSS + RS) Ln(1/511)
Note 1: The reference voltage (ADCREF) has no
effect on the equation, since it cancels
itself out.
2: The charge holding capacitor (CHOLD) is
not discharged after each conversion.
3: The maximum recommended impedance
for analog sources is 10
k
. This is
required to meet the pin leakage specifi-
cation.
4: After a conversion has completed, a
1.0TAD delay must be completed before
acquisition can begin again. During this
time the holding capacitor is not connected
to the selected ADC input channel.
TACQ
= Amplifier Setting Time +
Holding Capacitor Charging Time +
Temperature Coefficient
TACQ
=5
s + TCAP + [(Temp - 25°C)(0.05 s/°C)]
TCAP
=-CHOLD (RIC + RSS + RS) In(1/511)
-51.2 pF (1
k
+ 7k + 10k) In(0.0020)
-51.2 pF (18
k
) In(0.0020)
-0.921
s (-6.2364)
5.747
s
TACQ
=5
s + 5.747 s + [(50°C -25°C)(0.05s/°C)]
10.747
s + 1.25 s
11.997
s
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PIC16C781T-E/SS 功能描述:8位微控制器 -MCU w/Adv Analog 20MHz 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(chǔ)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
PIC16C781T-I/SO 功能描述:8位微控制器 -MCU 1.75KB 128RAM 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(chǔ)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
PIC16C781T-I/SS 功能描述:8位微控制器 -MCU 1.75KB 128RAM 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(chǔ)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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