參數(shù)資料
型號： PIC10F220EP
廠商： Microchip Technology Inc.
英文描述： 6-Pin, 8-Bit Flash Microcontrollers
中文描述： 6引腳，8位閃存微控制器
文件頁數(shù)： 34/78頁
文件大?。?/td> 583K
代理商： PIC10F220EP
PIC10F220/222
DS41270B-page 32
Preliminary
2006 Microchip Technology Inc.
7.9
A/D Acquisition Requirements
For the ADC to meet its specified accuracy, the charge
holding capacitor (C
HOLD
) must be allowed to fully
charge to the input channel voltage level. The Analog
Input model is shown in Figure 7-1. The source
impedance (R
S
) and the internal sampling switch (R
SS
)
impedance directly affect the time required to charge the
capacitor C
HOLD
. The sampling switch (R
SS
) impedance
varies over the device voltage (V
DD
), see Figure 7-1.
The maximum recommended impedance for analog
sources is 10 k
Ω
. As the source impedance is
decreased, the acquisition time may be decreased.
After the analog input channel is selected (or changed),
an A/D 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 (256 steps for the
ADC). The 1/2 LSb error is the maximum error allowed
for the ADC to meet its specified resolution.
EQUATION 7-1:
ACQUISITION TIME EXAMPLE
FIGURE 7-1:
ANALOG INPUT MODEL
T
ACQ
Amplifier Settling Time
T
AMP
T
C
+
2μs
T
C
+
+
Hold Capacitor Charging Time
Temperature Coefficient
+
+
=
=
=
T
COFF
Temperature - 25°C
+
[
(
)
0.05μs/°C
(
)
]
T
C
C
HOLD
R
IC
25
pF
1k
Ω
R
SS
7k
Ω
R
S
10k
Ω
+
+
+
+
(
)
ln(1/512)
)
ln(0.00196)
–
–
=
=
(
2.81
=
μs
T
ACQ
2μ
S
6.06
u
s
2.81
μ
S
50°C- 25°C
(
)
0.05μ
S
/°C
(
)
[
]
+
+
=
=
Solving for T
C
:
Therefore:
Temperature
50°C and external impedance of 10k
Ω
5.0V V
DD
=
Assumptions:
Note 1:
The charge holding capacitor (C
HOLD
) is not discharged after each conversion.
2:
The maximum recommended impedance for analog sources is 10 k
Ω
. This is required to meet the pin
leakage specification.
C
PIN
5 pF
VA
Rs
ANx
V
DD
V
T
= 0.6V
V
T
= 0.6V
I
± 500 nA
R
IC
≤
1k
Sampling
Switch
SS
Rss
C
HOLD
= 25 pF
V
SS
/V
REF
-
6V
5V
4V
3V
2V
Sampling Switch
(k
Ω
)
5 6 7 8 91011
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
R
SS
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相關代理商/技術參數(shù)
參數(shù)描述
PIC10F220-I 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D
PIC10F220I/MC 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D
PIC10F220-I/MC 功能描述:8位微控制器 -MCU 0.375KB 16B RAM 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
PIC10F220I/OT 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D
PIC10F220-I/OT 功能描述:8位微控制器 -MCU 384B Flash 16B RAM 4 I/O 8bit ADC 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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