參數(shù)資料
型號(hào)： PIC16C715
廠商： Microchip Technology Inc.
英文描述： 8-Bit CMOS Microcontroller with A/D Converter(每個(gè)I/O口有25mA驅(qū)動(dòng)/吸收電流，微控制器)
中文描述： 8位CMOS微控制器與A / D轉(zhuǎn)換器（每個(gè)的I / O口有25毫安驅(qū)動(dòng)/吸收電流，微控制器）
文件頁(yè)數(shù)： 38/120頁(yè)
文件大小： 764K
代理商： PIC16C715
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PIC16C715
DS30560A-page 38
Advance Information
1996 Microchip Technology Inc.
7.1
For the A/D converter to meet its specified accuracy,
the charge holding capacitor (C
to fully charge to the input channel voltage level. The
analog input model is shown in Figure 7-4. The source
impedance (R
S
) and the internal sampling switch (R
impedance directly affect the time required to charge
the capacitor C
HOLD
. The sampling switch (R
impedance varies over the device voltage (V
Figure 7-4.
The maximum recommended imped-
ance for analog sources is 10 k
input channel is selected (changed) this acquisition
must be done before the conversion can be started.
To calculate the minimum acquisition time, Equation 7-
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.
A/D Sampling Requirements
HOLD
) must be allowed
SS
)
SS
)
DD
), see
. After the analog
EQUATION 7-1:
A/D MINIMUM CHARGING
TIME
(-Tc/C
HOLD
V
HOLD
= (V
REF
- (V
REF
/512)) (1 - e
(R
IC
+ R
SS
+ R
S
))
)
or
Tc = -(51.2 pF)(1 k
Example 7-1 shows the calculation of the minimum
required acquisition time T
based on the following system assumptions.
Rs = 10 k
1/2 LSb error
V
DD
= 5V
→
Rss = 7 k
Temp (system max.) = 50
°
C
V
HOLD
= 0 @ t = 0
+ R
SS
+ R
S
) ln(1/511)
ACQ
. This calculation is
EXAMPLE 7-1:
CALCULATING THE
MINIMUM REQUIRED
SAMPLE TIME
T
ACQ
= Amplifier Settling Time +
Holding Capacitor Charging Time +
Temperature Coefficient
= 5
μ
s + Tc + [(Temp - 25
-C
HOLD
(R
IC
+ R
-51.2 pF (1 k
+ 7 k
-51.2 pF (18 k
) ln(0.0020)
-0.921
μ
s (-6.2146)
5.724
μ
s
= 5
μ
s + 5.724
μ
s + [(50
10.724
μ
s + 1.25
11.974
μ
s
T
T
ACQ
°
C)(0.05
) ln(1/512)
+ 10 k
μ
s/
°
C)]
C
=
SS
+ R
S
) ln(0.0020)
T
ACQ
°
C - 25
°
C)(0.05
μ
s/
°
C)]
μ
s
Note 1:
The reference voltage (V
effect on the equation, since it cancels
itself out.
Note 2:
The charge holding capacitor (C
HOLD
) is
not discharged after each conversion.
Note 3:
The maximum recommended impedance
for analog sources is 10 k
. This is
required to meet the pin leakage specifi-
cation.
Note 4:
After a conversion has completed, a
2.0 T
AD
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.
REF
) has no
FIGURE 7-4:
ANALOG INPUT MODEL
C
PIN
5 pF
VA
Rs
RAx
V
DD
V
T
= 0.6V
V
T
= 0.6V
I leakage
±
500 nA
R
IC
≤
1k
Sampling
Switch
SS
R
SS
C
= DAC capacitance
= 51.2 pF
V
SS
6V
5V
4V
3V
2V
Sampling Switch
( k
)
5 6 7 8 9 10 11
V
DD
Legend C
PIN
V
T
I leakage
R
IC
SS
C
HOLD
= input capacitance
= threshold voltage
= leakage current at the pin due to
various junctions
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
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相關(guān)代理商/技術(shù)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(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
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(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
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(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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