PIC18F2680-H/SP Microchip Technology, PIC18F2680-H/SP Datasheet - Page 254
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PIC18F2680-H/SP
Manufacturer Part Number
PIC18F2680-H/SP
Description
IC MCU 8BIT 48KB FLASH 28SPDIP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheet
1.PIC18F4585-IPT.pdf
(482 pages)
Specifications of PIC18F2680-H/SP
Core Processor
PIC
Core Size
8-Bit
Speed
25MHz
Connectivity
CAN, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
25
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
3.25K x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 150°C
Package / Case
28-DIP (0.300", 7.62mm)
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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PIC18F2585/2680/4585/4680
19.1
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 19-2. The
source impedance (R
switch (R
required to charge the capacitor C
switch (R
(V
at the analog input (due to pin leakage current). The
maximum recommended impedance for analog
sources is 2.5 kΩ. After the analog input channel is
selected (changed), the channel must be sampled for
at least the minimum acquisition time before starting a
conversion.
EQUATION 19-1:
EQUATION 19-2:
EQUATION 19-3:
DS39625C-page 252
T
V
or
T
T
T
T
Temperature coefficient is only required for temperatures > 25°C. Below 25°C, T
T
T
ACQ
C
ACQ
AMP
COFF
C
ACQ
DD
Note:
HOLD
). The source impedance affects the offset voltage
=
=
A/D Acquisition Requirements
SS
=
=
=
=
=
=
=
SS
) impedance varies over the device voltage
When the conversion is started, the
holding capacitor is disconnected from the
input pin.
) impedance directly affect the time
Amplifier Settling Time + Holding Capacitor Charging Time + Temperature Coefficient
T
(V
-(C
T
5 μs
(Temp – 25°C)(0.05 μs/°C)
(50°C – 25°C)(0.05 μs/°C)
1.25 μs
-(C
-(120 pF) (1 kΩ + 7 kΩ + 2.5 kΩ) ln(0.0004883) μs
9.61 μs
5 μs + 1.25 μs + 9.61 μs
12.86 μs
AMP
AMP
REF
HOLD
HOLD
+ T
+ T
– (V
)(R
)(R
C
C
ACQUISITION TIME
A/D MINIMUM CHARGING TIME
CALCULATING THE MINIMUM REQUIRED ACQUISITION TIME
S
REF
+ T
+ T
) and the internal sampling
IC
IC
+ R
COFF
/2048)) • (1 – e
+ R
COFF
SS
SS
HOLD
+ R
+ R
HOLD
S
S
) must be allowed
) ln(1/2048)
) ln(1/2047) μs
. The sampling
(-Tc/C
HOLD
(R
Preliminary
IC
+ R
SS
+ R
S
))
)
To
Equation 19-1 may be used. 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.
Example 19-3 shows the calculation of the minimum
required acquisition time T
based
assumptions:
C
Rs
Conversion Error
V
Temperature
V
DD
HOLD
HOLD
calculate
on
COFF
the
= 0 ms.
the
=
=
≤
=
=
=
following
minimum
© 2007 Microchip Technology Inc.
120 pF
2.5 kΩ
1/2 LSb
5V → Rss = 7 kΩ
50°C (system max.)
0V @ time = 0
ACQ
. This calculation is
application
acquisition
system
time,
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