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PIC16F570-I/SP датащи(PDF) 55 Page - Microchip Technology

номер детали PIC16F570-I/SP
подробное описание детали  28-Pin, 8-Bit Flash Microcontroller
PDF  129 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F570-I/SP датащи(HTML) 55 Page - Microchip Technology

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 2013-2014 Microchip Technology Inc.
DS40001684E-page 55
PIC16F570
EQUATION 9-1:
ACQUISITION TIME EXAMPLE
FIGURE 9-1:
ANALOG INPUT MODULE
Note 1: The charge holding capacitor (CHOLD) is
not discharged after each conversion.
2: The maximum recommended impedance
for analog sources is 10 k
. This is
required to meet the pin leakage
specification.
Assumptions:
Temperature = 50°C and external impedance of 10 k
 5.0V VDD
Tacq
= Amplifier Settling Time + Hold Capacitor Charging Time + Temperature Coefficient
=TAMP + TC + TCOFF
=2
s + TC + [(Temperature - 25°C)(0.05 s/°C)]
Solving for Tc:
Tc
= CHOLD (RIC + RSS + RS) In(1/512)
= -25pF (l k
 + 7 k + 10 k ) In(0.00196)
=2.81
s
Therefore:
Tacq
= 2
s + 2.81 s + [(50°C-25°C)(0.0 5s/°C)]
=6.06
s
CPIN
VA
Rs
ANx
5 pF
VDD
VT = 0.6V
VT = 0.6V
I LEAKAGE
RIC
 1k
Sampling
Switch
SS Rss
CHOLD = 25 pF
VSS/VREF-
6V
Sampling Switch
5V
4V
3V
2V
567 8 9 10 11
(k
)
VDD
± 500 nA
RSS
Legend:
CPIN
= Input Capacitance
VT
= Threshold Voltage
ILEAKAGE
= Leakage current at the pin due
to various junctions
RIC
= Interconnect Resistance
SS
= Sampling Switch
CHOLD
= Sample/Hold Capacitance



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