PIC18LF27J13-I/SS Microchip Technology, PIC18LF27J13-I/SS Datasheet - Page 403
PIC18LF27J13-I/SS
Manufacturer Part Number
PIC18LF27J13-I/SS
Description
IC PIC MCU 128KB FLASH 28SSOP
Manufacturer
Microchip Technology
Series
PIC® XLP™ 18Fr
Datasheets
1.PIC18LF24J10-ISS.pdf
(32 pages)
2.PIC18F26J13-ISS.pdf
(496 pages)
3.PIC18F26J13-ISS.pdf
(558 pages)
4.PIC18F26J13-ISS.pdf
(12 pages)
Specifications of PIC18LF27J13-I/SS
Core Size
8-Bit
Program Memory Size
128KB (64K x 16)
Core Processor
PIC
Speed
48MHz
Connectivity
I²C, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Type
FLASH
Ram Size
3.8K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 2.75 V
Data Converters
A/D 10x10b/12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Controller Family/series
PIC18
Cpu Speed
48MHz
Digital Ic Case Style
SSOP
Supply Voltage Range
1.8V To 3.6V
Embedded Interface Type
I2C, SPI, USART
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
- PIC18LF24J10-ISS PDF datasheet
- PIC18F26J13-ISS PDF datasheet #2
- PIC18F26J13-ISS PDF datasheet #3
- PIC18F26J13-ISS PDF datasheet #4
- Current page: 403 of 558
- Download datasheet (5Mb)
26.3.2
There is a small amount of capacitance from the inter-
nal A/D Converter sample capacitor as well as stray
capacitance from the circuit board traces and pads that
affect the precision of capacitance measurements. A
measurement of the stray capacitance can be taken by
making sure the desired capacitance to be measured
has been removed. The measurement is then
performed using the following steps:
1.
2.
3.
4.
5.
6.
where I is known from the current source measurement
step, t is a fixed delay and V is measured by performing
an A/D conversion.
2010 Microchip Technology Inc.
Initialize the A/D Converter and the CTMU.
Set EDG1STAT (= 1).
Wait for a fixed delay of time, t.
Clear EDG1STAT.
Perform an A/D conversion.
Calculate the stray and A/D sample capacitances:
C
OFFSET
CAPACITANCE CALIBRATION
=
C
STRAY
+
C
AD
=
I t
V
Preliminary
PIC18F47J13 FAMILY
This measured value is then stored and used for
calculations of time measurement or subtracted for
capacitance measurement. For calibration, it is
expected that the capacitance of C
approximately known. C
An iterative process may need to be used to adjust the
time, t, that the circuit is charged to obtain a reasonable
voltage reading from the A/D Converter. The value of t
may be determined by setting C
value, then solving for t. For example, if C
theoretically calculated to be 11 pF, and V is expected
to be 70% of V
or 63 s.
See Example 26-3 for a typical routine for CTMU
capacitance calibration.
(4 pF + 11 pF) • 2.31V/0.55 A
DD
or 2.31V, then t would be:
AD
is approximately 4 pF.
OFFSET
DS39974A-page 403
STRAY
to a theoretical
+ C
STRAY
AD
is
is
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