PIC18F26K80-I/SO Microchip Technology, PIC18F26K80-I/SO Datasheet - Page 254

• Manufacturer Part Number: PIC18F26K80-I/SO
• Description: MCU PIC 64KB FLASH 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F26K80-I/SO

• Core Size: 8-Bit
• Program Memory Size: 64KB (32K x 16)
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Core Processor: PIC
• Speed: 64MHz
• Connectivity: ECAN, I²C, LIN, SPI, UART/USART
• Number Of I /o: 24
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 3.6K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (0.300", 7.50mm Width)
• Controller Family/series: PIC18
• Ram Memory Size: 4KB
• Cpu Speed: 16MIPS
• No. Of Pwm Channels: 5
• Embedded Interface Type: I2C, SPI, USART
• Processor Series: PIC18F26K80
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 64 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 5
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F66K80 FAMILY
18.6
Time can be precisely measured after the ratio ( C/I ) is
measured from the current and capacitance calibration
step. To do that:
1.
2.
3.
4.
5.
FIGURE 18-3:
DS39977C-page 254
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
• C is calculated in the capacitance calibra-
• V is measured by performing the A/D conversion
step ( Section 18.4.1 “Current Source
Calibration” )
tion step ( Section 18.4.2 “Capacitance
Calibration” )
Measuring Time with the CTMU
Module
TYPICAL CONNECTIONS AND INTERNAL CONFIGURATION FOR TIME
MEASUREMENT
CTED1
CTED2
AN
C
EXT
X
Preliminary
EDG2
EDG1
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 bits
CHS<4:0> (ADCON0<6:2>) to an unused A/D channel,
the corresponding pin for which is not connected to any
circuit board trace. This minimizes added stray capaci-
tance, keeping the total circuit capacitance close to that
of the A/D Converter itself (25 pF).
To measure longer time intervals, an external capacitor
may be connected to an A/D channel and that channel
selected whenever making a time measurement.
C
AD
A/D Converter
PIC18F66K80
Current Source
CTMU
A/D Voltage
 2011 Microchip Technology Inc.
AD
+ C
EXT
, provides a valid