PIC18F4450-I/P Microchip Technology, PIC18F4450-I/P Datasheet - Page 182
PIC18F4450-I/P
Manufacturer Part Number
PIC18F4450-I/P
Description
IC PIC MCU FLASH 8KX16 40DIP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC18F2221-ISO.pdf
(46 pages)
2.PIC18F2450-ISO.pdf
(324 pages)
3.PIC18F2450-ISO.pdf
(6 pages)
4.PIC18F2450-ISO.pdf
(8 pages)
5.PIC18F2450-ISO.pdf
(4 pages)
6.PIC18F2450-ISO.pdf
(4 pages)
7.PIC18F4450-IP.pdf
(322 pages)
Specifications of PIC18F4450-I/P
Program Memory Type
FLASH
Program Memory Size
16KB (8K x 16)
Package / Case
40-DIP (0.600", 15.24mm)
Core Processor
PIC
Core Size
8-Bit
Speed
48MHz
Connectivity
UART/USART, USB
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
34
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 13x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC18F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
768 B
Interface Type
EUSART/USB
Maximum Clock Frequency
48 MHz
Number Of Programmable I/os
34
Number Of Timers
3
Operating Supply Voltage
2 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, DM163025, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
13-ch x 10-bit
Package
40PDIP
Device Core
PIC
Family Name
PIC18
Maximum Speed
48 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
DM163025 - PIC DEM FULL SPEED USB DEMO BRD444-1001 - DEMO BOARD FOR PICMICRO MCU
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F4450-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC18F2221-ISO PDF datasheet
- PIC18F2450-ISO PDF datasheet #2
- PIC18F2450-ISO PDF datasheet #3
- PIC18F2450-ISO PDF datasheet #4
- PIC18F2450-ISO PDF datasheet #5
- PIC18F2450-ISO PDF datasheet #6
- PIC18F4450-IP PDF datasheet #7
- Current page: 182 of 324
- Download datasheet (6Mb)
PIC18F2450/4450
16.1
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 16-3. 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 16-1:
EQUATION 16-2:
EQUATION 16-3:
DS39760D-page 180
T
V
or
T
T
T
T
Temperature coefficient is only required for temperatures > 25°C. Below 25°C, T
T
T
ACQ
DD
Note:
C
ACQ
AMP
COFF
C
ACQ
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.
Amplifier Settling Time + Holding Capacitor Charging Time + Temperature Coefficient
T
) impedance directly affect the time
AMP
T
0.2 μs
(Temp – 25°C)(0.02 μs/°C)
(85°C – 25°C)(0.02 μs/°C)
1.2 μs
-(C
-(25 pF) (1 kΩ + 2 kΩ + 2.5 kΩ) ln(0.0004883) μs
1.05 μs
0.2 μs + 1 μs + 1.2 μs
2.4 μs
(V
-(C
AMP
HOLD
+ T
REF
HOLD
+ T
C
– (V
ACQUISITION TIME
A/D MINIMUM CHARGING TIME
CALCULATING THE MINIMUM REQUIRED ACQUISITION TIME
S
+ T
)(R
C
) and the internal sampling
)(R
+ T
REF
COFF
IC
IC
+ R
COFF
/2048)) • (1 – e
+ R
HOLD
SS
SS
HOLD
+ R
+ R
) must be allowed
S
S
) ln(1/2047) μs
. The sampling
) ln(1/2048)
(-T
C
/C
HOLD
(R
IC
+ R
SS
+ R
S
To
Equation 16-1 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 16-3 shows the calculation of the minimum
required acquisition time T
based
assumptions:
C
Rs
Conversion Error
V
Temperature
))
HOLD
DD
)
calculate
on
COFF
the
= 0 ms.
the
=
=
≤
=
=
following
minimum
© 2008 Microchip Technology Inc.
25 pF
2.5 kΩ
1/2 LSb
5V → R
85°C (system max.)
ACQ
. This calculation is
SS
application
acquisition
= 2 kΩ
system
time,
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