PIC18F4431-I/PT Microchip Technology, PIC18F4431-I/PT Datasheet - Page 257
PIC18F4431-I/PT
Manufacturer Part Number
PIC18F4431-I/PT
Description
IC PIC MCU FLASH 8KX16 44TQFP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F818-ISO.pdf
(6 pages)
3.PIC18F2331-ISO.pdf
(392 pages)
4.PIC18F2331-ISO.pdf
(8 pages)
5.PIC18F2331-ISO.pdf
(6 pages)
6.PIC18F2331-ISO.pdf
(16 pages)
7.PIC18LF2331-ISO.pdf
(40 pages)
8.PIC18F2431-ISP.pdf
(396 pages)
Specifications of PIC18F4431-I/PT
Program Memory Type
FLASH
Program Memory Size
16KB (8K x 16)
Package / Case
44-TQFP, 44-VQFP
Core Processor
PIC
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
Number Of I /o
36
Eeprom Size
256 x 8
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 9x10b
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/SPI/SSP
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
36
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, ICE2000, ICE4000, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
9-ch x 10-bit
Package
44TQFP
Device Core
PIC
Family Name
PIC18
Maximum Speed
40 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
XLT44PT3 - SOCKET TRAN ICE 44MQFP/TQFPAC164305 - MODULE SKT FOR PM3 44TQFP444-1001 - DEMO BOARD FOR PICMICRO MCUAC164020 - MODULE SKT PROMATEII 44TQFP
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F4431-I/PT
Manufacturer:
MICROCHIP
Quantity:
1 400
Company:
Part Number:
PIC18F4431-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
Part Number:
PIC18F4431-I/PT
Manufacturer:
MICROCHI
Quantity:
20 000
- PIC16F616T-ISL PDF datasheet
- PIC16F818-ISO PDF datasheet #2
- PIC18F2331-ISO PDF datasheet #3
- PIC18F2331-ISO PDF datasheet #4
- PIC18F2331-ISO PDF datasheet #5
- PIC18F2331-ISO PDF datasheet #6
- PIC18LF2331-ISO PDF datasheet #7
- PIC18F2431-ISP PDF datasheet #8
- Current page: 257 of 396
- Download datasheet (8Mb)
20.4
If external voltage references are used instead of the
internal AV
impedance of the V
must be considered. During acquisition, currents
supplied by these sources are insignificant. However,
during conversion, the A/D module sinks and sources
current through the reference sources.
In order to maintain the A/D accuracy, the voltage
reference source impedances should be kept low to
reduce voltage changes. These voltage changes occur
as reference currents flow through the reference
source impedance.
20.5
The ADCON2 register allows the user to select an
acquisition time that occurs each time an A/D conver-
sion is triggered.
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 the
start
ACQT3:ACQT0 bits (ADCON2<6:3>) remain in their
Reset state (‘0000’).
If desired, the ACQT bits can be set to select a
programmable acquisition time for the A/D module.
When triggered, the A/D module continues to sample
the input for the selected acquisition time, then
automatically
acquisition time is programmed, there may be no need
to wait for an acquisition time between selecting a
channel and triggering the A/D. If an acquisition time is
programmed, there is nothing to indicate if the
acquisition time has ended, or if the conversion has
begun.
2003 Microchip Technology Inc.
Note:
of
A/D Voltage References
Selecting and Configuring
Automatic Acquisition Time
When using external references, the
source impedance of the external voltage
references must be less than 75 in order
to achieve the specified ADC resolution. A
higher reference source impedance will
increase the ADC offset and gain errors.
Resistive voltage dividers will not provide
a low enough source impedance. To
ensure the best possible ADC perfor-
mance, external VREF inputs should be
buffered with an op-amp or other low
impedance circuit.
conversion.
DD
begins
and AV
REF
+ and V
a
This
SS
conversion.
sources, the source
REF
occurs
- voltage sources
when
Since
PIC18F2331/2431/4331/4431
Preliminary
the
the
20.6
The A/D conversion time per bit is defined as T
A/D conversion requires 12 T
The source of the A/D conversion clock is software
selectable. There are eight possible options for T
For correct A/D conversions, the A/D conversion clock
(T
minimum T
130 for more information).
Table 20-2 shows the resultant T
the device operating frequencies and the A/D clock
source selected.
AD
) must be as short as possible, but greater than the
• 2 T
• 4 T
• 8 T
• 16 T
• 32 T
• 64 T
• Internal RC Oscillator
• Internal RC Oscillator/4
Selecting the A/D Conversion
Clock
OSC
OSC
OSC
OSC
OSC
OSC
AD
(approximately 416 s, see parameter
AD
per 10-bit conversion.
AD
DS39616B-page 255
times derived from
AD
AD
. The
:
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