PIC18LF27J13-I/SO Microchip Technology, PIC18LF27J13-I/SO Datasheet - Page 407

• Manufacturer Part Number: PIC18LF27J13-I/SO
• Description: IC PIC MCU 128KB FLASH 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18LF27J13-I/SO

• 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: SOIC
• 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

26.5
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 26-3:
 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 26.3.1 “Current Source Calibration”),
C is calculated in the capacitance calibration step
(Section 26.3.2 “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
C
EXT
X
Preliminary
EDG2
EDG1
PIC18F47J13 FAMILY
C
It is assumed that the time measured is small enough
that the capacitance, C
voltage to the A/D Converter. For the smallest time
measurement, always set the A/D Channel Select
register (AD1CHS) to an unused A/D channel; the cor-
responding pin for which is not connected to any circuit
board trace. This minimizes added stray capacitance,
keeping 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.
AD
A/D Converter
PIC18F47J13
Current Source
CTMU
A/D Voltage
AD
+ C
EXT
DS39974A-page 407
, provides a valid