PIC18F2450-I/SO Microchip Technology, PIC18F2450-I/SO Datasheet - Page 183

• Manufacturer Part Number: PIC18F2450-I/SO
• Description: IC PIC MCU FLASH 8KX16 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F2450-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 16KB (8K x 16)
• Package / Case: 28-SOIC (7.5mm Width)
• 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: 23
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 10x10b
• 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: 23
• 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, ICE2000, ICE4000, DM163014, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• Package: 28SOIC W
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 48 MHz
• A/d Bit Size: 10 bit
• A/d Channels Available: 10
• Height: 2.31 mm
• Length: 17.87 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Width: 7.49 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164322 - MODULE SOCKET MPLAB PM3 28/44QFNDM163025 - PIC DEM FULL SPEED USB DEMO BRD
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

16.2
The ADCON2 register allows the user to select an
acquisition time that occurs each time the GO/DONE
bit is set. It also gives users the option to use an
automatically determined acquisition time.
Acquisition time may be set with the ACQT2:ACQT0
bits (ADCON2<5:3>) which provide a range of 2 to
20 T
continues to sample the input for the selected
acquisition
conversion. Since the acquisition time is programmed,
there may be no need to wait for an acquisition time
between selecting a channel and setting the GO/DONE
bit.
Manual
ACQT2:ACQT0 = 000. When the GO/DONE bit is set,
sampling is stopped and a conversion begins. The user
is responsible for ensuring the required acquisition time
has passed between selecting the desired input
channel and setting the GO/DONE bit. This option is
also the default Reset state of the ACQT2:ACQT0 bits
and is compatible with devices that do not offer
programmable acquisition times.
In either case, when the conversion is completed, the
GO/DONE bit is cleared, the ADIF flag is set and the
A/D begins sampling the currently selected channel
again. If an acquisition time is programmed, there is
nothing to indicate if the acquisition time has ended or
if the conversion has begun.
TABLE 16-1:
© 2007 Microchip Technology Inc.
Note 1:
AD
. When the GO/DONE bit is set, the A/D module
2:
3:
4:
Selecting and Configuring
Acquisition Time
Operation
The RC source has a typical T
The RC source has a typical T
For device frequencies above 1 MHz, the device must be in Sleep for the entire conversion or the A/D
accuracy may be out of specification.
Low-power devices only.
16 T
32 T
64 T
acquisition
2 T
4 T
8 T
RC
time,
OSC
OSC
OSC
OSC
OSC
OSC
(3)
AD Clock Source (T
T
AD
then
vs. DEVICE OPERATING FREQUENCIES
automatically
is
selected
ADCS2:ADCS0
AD
)
AD
AD
000
100
001
101
010
110
x11
begins
time of 1.2 μs.
time of 2.5 μs.
when
Preliminary
a
16.3
The A/D conversion time per bit is defined as T
A/D conversion requires 11 T
The source of the A/D conversion clock is software
selectable. There are seven possible options for T
• 2 T
• 4 T
• 8 T
• 16 T
• 32 T
• 64 T
• Internal RC Oscillator
For correct A/D conversions, the A/D conversion clock
(T
minimum T
more information).
Table 16-1 shows the resultant T
the device operating frequencies and the A/D clock
source selected.
AD
PIC18FX450
22.86 MHz
45.71 MHz
) must be as short as possible but greater than the
11.43 MHz
1.00 MHz
2.86 MHz
5.71 MHz
48.0 MHz
OSC
OSC
OSC
OSC
OSC
OSC
Selecting the A/D Conversion
Clock
PIC18F2450/4450
Maximum Device Frequency
AD
(1)
(see parameter 130 in Table 21-18 for
AD
PIC18LFX450
per 10-bit conversion.
AD
1.00 MHz
11.43 MHz
22.86 MHz
45.71 MHz
1.43 MHz
2.86 MHz
5.72 MHz
DS39760C-page 181
times derived from
(2)
(4)
AD
. The
AD
: