參數(shù)資料
型號： PIC12C672-04I/SM
廠商： Microchip Technology
文件頁數(shù)： 73/129頁
文件大?。?/td> 0K
描述： IC MCU OTP 2KX14 A/D 8-SOIJ
產品培訓模塊： Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標準包裝： 90
系列： PIC® 12C
核心處理器： PIC
芯體尺寸： 8-位
速度： 4MHz
外圍設備： POR，WDT
輸入/輸出數(shù)： 5
程序存儲器容量： 3.5KB（2K x 14）
程序存儲器類型： OTP
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
數(shù)據(jù)轉換器： A/D 4x8b
振蕩器型： 內部
工作溫度： -40°C ~ 85°C
封裝/外殼： 8-SOIC（0.209"，5.30mm 寬）
包裝： 管件
配用： XLT08SO-1-ND - SOCKET TRANSITION 8SOIC 150/208
AC164312-ND - MODULE SKT FOR PM3 16SOIC
ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
309-1048-ND - ADAPTER 8-SOIC TO 8-DIP
309-1047-ND - ADAPTER 8-SOIC TO 8-DIP
AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC
PIC12C67X
DS30561B-page 48
1999 Microchip Technology Inc.
8.1
A/D Sampling Requirements
For the A/D converter to meet its specified accuracy,
the charge holding capacitor (CHOLD) must be allowed
to fully charge to the input channel voltage level. The
analog input model is shown in Figure 8-2. The source
impedance (RS) and the internal sampling switch (RSS)
impedance directly affect the time required to charge
the capacitor CHOLD. The sampling switch (RSS)
impedance varies over the device voltage (VDD), see
The maximum recommended imped-
ance for analog sources is 10 k
. After the analog
input channel is selected (changed), this acquisition
must be done before the conversion can be started.
To calculate the minimum acquisition time, Equation 8-1
may be used. This equation assumes that 1/2 LSb error
is used (512 steps for the A/D). The 1/2 LSb error is the
maximum error allowed for the A/D to meet its specified
resolution.
EQUATION 8-1:
A/D MINIMUM CHARGING
TIME
VHOLD = (VREF - (VREF/512)) (1 - e(-Tc/C
HOLD
(RIC + RSS + RS)))
or
Tc = -(51.2 pF)(1 k
+ RSS + RS) ln(1/511)
Example 8-1 shows the calculation of the minimum
required acquisition time TACQ. This calculation is
based on the following system assumptions.
Rs = 10 k
1/2 LSb error
VDD = 5V
→ Rss = 7 k
Temp (system max.) = 50
°C
VHOLD = 0 @ t = 0
EXAMPLE 8-1:
CALCULATING THE
MINIMUM REQUIRED
SAMPLE TIME
TACQ = Internal Amplifier Settling Time +
Holding Capacitor Charging Time +
Temperature Coefficient
TACQ =5
s + Tc + [(Temp - 25°C)(0.05 s/°C)]
TC =-CHOLD (RIC + RSS + RS) ln(1/512)
-51.2 pF (1 k
+ 7 k + 10 k) ln(0.0020)
-51.2 pF (18 k
) ln(0.0020)
-0.921
s (-6.2146)
5.724
s
TACQ =5
s + 5.724 s + [(50°C - 25°C)(0.05 s/°C)]
10.724
s + 1.25 s
11.974
s
Note 1: The reference voltage (VREF) 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
2.0 TAD delay must
complete before
acquisition can begin again. During this
time, the holding capacitor is not con-
nected to the selected A/D input channel.
FIGURE 8-2:
ANALOG INPUT MODEL
CPIN
VA
Rs
RAx
5 pF
VDD
VT = 0.6V
I leakage
RIC
≤ 1k
Sampling
Switch
SS
Rss
CHOLD
= DAC capacitance
VSS
6V
Sampling Switch
5V
4V
3V
2V
567 8 9 10 11
( k
)
VDD
= 51.2 pF
± 500 nA
Legend: CPIN
VT
I leakage
RIC
SS
CHOLD
= input capacitance
= threshold voltage
= leakage current at the pin due to
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
various junctions
相關PDF資料
PDF描述
PIC12C671-04I/SM IC MCU OTP 1KX14 A/D 8-SOIJ
PIC18F26K20-I/SO IC PIC MCU FLASH 32KX16 28-SOIC
PIC18LF24J11-I/SO IC PIC MCU FLASH 16K 2V 28-SOIC
DSPIC33FJ16MC102-I/SS IC DSP 16BIT 16KB 28SSOP
PIC24FJ16MC102-I/SS IC MCU 16BIT 16KB FLASH 28SSOP
相關代理商/技術參數(shù)
參數(shù)描述
PIC12C672-10 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin, 8-Bit CMOS Microcontroller with A/D Converter
PIC12C672-10/JM 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin, 8-Bit CMOS Microcontroller with A/D Converter
PIC12C672-10/JW 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MICROCONTROLLER|8-BIT|PIC CPU|CMOS|DIP|8PIN|CERAMIC
PIC12C672-10/P 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 6 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
PIC12C672-10/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 12C672 DIP8
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*