PIC18F2423-I/SO Microchip Technology, PIC18F2423-I/SO Datasheet - Page 31

• Manufacturer Part Number: PIC18F2423-I/SO
• Description: IC PIC MCU FLASH 8KX16 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F2423-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: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 25
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 10x12b
• 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/I2C/MSSP/SPI
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 25
• Number Of Timers: 4
• 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, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10-ch x 12-bit
• Package: 28SOIC W
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 40 MHz
• Height: 2.31 mm
• Length: 17.9 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Width: 7.5 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT28SO-1 - SOCKET TRANSITION 28SOIC 300MIL
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2.2
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 of having an
automatically determined acquisition time.
Acquisition time may be set with the ACQT<2:0> bits
(ADCON2<5:3>), which provide a range of 2 to 20 T
When the GO/DONE bit is set, the A/D module con-
tinues to sample the input for the selected acquisition
time, then automatically begins a 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
ACQT<2:0> = 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 ACQT<2:0> 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 2-2:
© 2009 Microchip Technology Inc.
Note 1:
2:
Selecting and Configuring
Acquisition Time
acquisition
The RC source has a typical T
For device frequencies above 1 MHz, the device must be in Sleep for the entire conversion or a F
divider should be used instead; otherwise, the A/D accuracy specification may not be met.
Operation
16 T
32 T
64 T
2 T
4 T
8 T
T
RC
AD
OSC
OSC
OSC
OSC
OSC
OSC
(2)
vs. DEVICE OPERATING FREQUENCIES
time
A/D Clock Source (T
is
selected
AD
time of 2.5 μs.
PIC18F2423/2523/4423/4523
AD
when
)
AD
.
ADCS<2:0>
000
100
001
101
010
110
x11
2.3
The A/D conversion time per bit is defined as T
A/D conversion requires 13 T
The source of the A/D conversion clock is software
selectable.
There are seven possible options for T
For correct A/D conversions, the A/D conversion clock
(T
minimum T
on page 41.)
Table 2-2 shows the resultant T
the device operating frequencies and the A/D clock
source selected.
• 2 T
• 4 T
• 8 T
• 16 T
AD
) must be as short as possible, but greater than the
OSC
OSC
OSC
OSC
Selecting the A/D Conversion
Clock
AD
. (For more information, see parameter 130
Assumes T
• 32 T
• 64 T
• Internal RC Oscillator
Maximum F
OSC
OSC
1.00 MHz
10.00 MHz
20.00 MHz
40.00 MHz
40.00 MHz
AD
2.50 MHz
5.00 MHz
AD
AD
per 12-bit conversion.
times derived from
Min. = 0.8 μs
DS39755C-page 31
AD
(1)
OSC
:
OSC
AD
. The