PIC18LF25K22-I/SP Microchip Technology, PIC18LF25K22-I/SP Datasheet - Page 327
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PIC18LF25K22-I/SP
Manufacturer Part Number
PIC18LF25K22-I/SP
Description
MCU 8BIT 32KB FLASH 3.6V 28SDIP
Manufacturer
Microchip Technology
Series
PIC® XLP™ 18Fr
Datasheets
1.PIC18F26J13-ISS.pdf
(496 pages)
2.PIC18F25K22T-ISS.pdf
(10 pages)
3.PIC18F25K22-ISP.pdf
(492 pages)
Specifications of PIC18LF25K22-I/SP
Program Memory Type
FLASH
Program Memory Size
32KB (16K x 16)
Package / Case
28-DIP (0.300", 7.62mm)
Core Processor
PIC
Core Size
8-Bit
Speed
64MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
24
Eeprom Size
256 x 8
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 19x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC18LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
1536 B
Interface Type
I2C, SPI, EUSART
Maximum Clock Frequency
64 MHz
Number Of Programmable I/os
25
Number Of Timers
7
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
3rd Party Development Tools
52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
Development Tools By Supplier
PG164130, DV164005
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 17 Channel
On-chip Dac
5 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
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19.5
Time can be precisely measured after the ratio (C/I) is
measured from the current and capacitance calibration
step by following these steps:
1.
2.
3.
4.
5.
FIGURE 19-3:
2010 Microchip Technology Inc.
Initialize the A/D Converter and the CTMU.
Set EDG1STAT.
Set EDG2STAT.
Perform an A/D conversion.
Calculate the time between edges as T = (C/I) * V,
where I is calculated in the current calibration step
(Section 19.3.1 “Current Source Calibration”),
C is calculated in the capacitance calibration step
(Section 19.3.2 “Capacitance Calibration”) and
V is measured by performing the A/D conversion.
Measuring Time with the CTMU
Module
TYPICAL CONNECTIONS AND INTERNAL CONFIGURATION FOR TIME
MEASUREMENT
CTED1
CTED2
AN
R
PR
X
PIC18(L)FXXK22 Device
EDG2
Preliminary
EDG1
C
AD
A/D Converter
Current Source
CTMU
Output Pulse
It is assumed that the time measured is small enough
that the capacitance, C
to the A/D Converter. For the smallest time measure-
ment, always set the A/D Channel Select register
(AD1CHS) to an unused A/D channel; the correspond-
ing pin for which is not connected to any circuit board
trace. This minimizes added stray capacitance, keep-
ing the total circuit capacitance close to that of the A/D
Converter itself (4-5 pF). To measure longer time
intervals, an external capacitor may be connected to an
A/D channel and this channel selected when making a
time measurement.
PIC18(L)F2X/4XK22
OFFSET
, provides a valid voltage
DS41412B-page 327
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