PIC16F872T-I/SS Microchip Technology, PIC16F872T-I/SS Datasheet - Page 84
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PIC16F872T-I/SS
Manufacturer Part Number
PIC16F872T-I/SS
Description
IC MCU FLASH 2KX14 EE 28SSOP
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F688T-ISL.pdf
(688 pages)
3.PIC16C770-ISO.pdf
(8 pages)
4.PIC16F872-ISO.pdf
(168 pages)
5.PIC16F872-ISO.pdf
(5 pages)
6.PIC16F872-ISO.pdf
(6 pages)
Specifications of PIC16F872T-I/SS
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
3.5KB (2K x 14)
Program Memory Type
FLASH
Eeprom Size
64 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 5x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
28-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F872T-I/SS
Manufacturer:
MICROCHIP
Quantity:
1 450
PIC16F872
10.1
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 10-2. The
source impedance (R
switch (R
required to charge the capacitor C
switch (R
(V
impedance for analog sources is 10 k . As the
impedance is decreased, the acquisition time may be
EQUATION 10-1:
FIGURE 10-2:
DS30221C-page 82
T
T
T
DD
ACQ
C
ACQ
Note 1: The reference voltage (V
), Figure 10-2. The maximum recommended
A/D Acquisition Requirements
SS
2: The charge holding capacitor (C
3: The maximum recommended impedance for analog sources is 10 k . This is required to meet the pin
SS
=
=
=
=
=
=
=
) impedance varies over the device voltage
leakage specification.
) impedance directly affect the time
Amplifier Settling Time + Hold Capacitor Charging Time + Temperature Coefficient
T
2 s + T
C
16.47 s
2 s + 16.47 s + [(50°C -25°C)(0.05 s/°C)
19.72 s
AMP
HOLD
Legend C
+ T
(R
C
VA
C
ACQUISITION TIME
+ [(Temperature -25°C)(0.05 s/°C)]
ANALOG INPUT MODEL
IC
S
+ T
V
I
R
SS
C
) and the internal sampling
R
+ R
LEAKAGE
T
PIN
IC
HOLD
S
COFF
SS
ANx
+ R
C
5 pF
HOLD
PIN
= input capacitance
= threshold voltage
= leakage current at the pin due to
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
HOLD
S
) In(1/2047) - 120 pF (1 k + 7 k + 10 k ) In(0.0004885)
various junctions
) must be allowed
REF
. The sampling
) has no effect on the equation, since it cancels itself out.
HOLD
V
DD
V
V
) is not discharged after each conversion.
T
T
= 0.6V
= 0.6V
I
± 500 nA
LEAKAGE
decreased. After the analog input channel is selected
(changed), this acquisition must be done before the
conversion can be started.
Equation 10-1 may be used to calculate the minimum
acquisition time. This equation assumes that 1/2 LSb
error is used (1024 steps for the A/D). The 1/2 LSb
error is the maximum error allowed for the A/D to meet
its specified resolution.
To calculate the minimum acquisition time, T
the
(DS33023).
R
IC
PICmicro™
1k
V
SS R
DD
Sampling
Switch
6V
5V
4V
3V
2V
SS
Mid-Range
Sampling Switch
5 6 7 8 9 10 11
V
© 2006 Microchip Technology Inc.
C
= DAC capacitance
= 120 pF
SS
(k )
HOLD
Reference
ACQ
Manual
, see