PIC16LF1827-I/SO Microchip Technology, PIC16LF1827-I/SO Datasheet - Page 319

• Manufacturer Part Number: PIC16LF1827-I/SO
• Description: IC MCU 8BIT 4KB FLASH 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16LF1827-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 7KB (4K x 14)
• Package / Case: 18-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 32MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Eeprom Size: 256 x 8
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16LF
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 384 B
• Interface Type: I2C/SPI/UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 15
• Number Of Timers: 5
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12-ch x 10-bit
• 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

26.5
The software portion of the capacitive sensing module
is required to determine the change in frequency of the
capacitive sensing oscillator. This is accomplished by
the following:
• Setting a fixed time base to acquire counts on
• Establishing the nominal frequency for the
• Establishing the reduced frequency for the
• Set the frequency threshold
26.5.1
To determine the nominal frequency of the capacitive
sensing oscillator:
• Remove any extra capacitive load on the selected
• At the start of the fixed time base, clear the timer
• At the end of the fixed time base save the value in
The value of the timer resource is the number of
oscillations of the capacitive sensing oscillator for the
given time base. The frequency of the capacitive
sensing oscillator is equal to the number of counts on
in the timer divided by the period of the fixed time base.
26.5.2
The extra capacitive load will cause the frequency of the
capacitive sensing oscillator to decrease. To determine
the reduced frequency of the capacitive sensing
oscillator:
• Add a typical capacitive load on the selected
• Use the same fixed time base as the nominal
• At the start of the fixed time base, clear the timer
• At the end of the fixed time base save the value in
The value of the timer resource is the number of oscil-
lations of the capacitive sensing oscillator with an addi-
tional capacitive load. The frequency of the capacitive
sensing oscillator is equal to the number of counts on
in the timer divided by the period of the fixed time base.
This frequency should be less than the value obtained
during the nominal frequency measurement.
 2010 Microchip Technology Inc.
Timer0 or Timer1
capacitive sensing oscillator
capacitive sensing oscillator due to an additional
capacitive load
CPSx pin
resource
the timer resource
CPSx pin
frequency measurement
resource
the timer resource
Software Control
NOMINAL FREQUENCY
(NO CAPACITIVE LOAD)
REDUCED FREQUENCY
(ADDITIONAL CAPACITIVE LOAD)
Preliminary
26.5.3
The frequency threshold should be placed midway
between the value of nominal frequency and the
reduced frequency of the capacitive sensing oscillator.
Refer to Application Note AN1103, “Software Handling
for Capacitive Sensing” (DS01103) for more detailed
information on the software required for capacitive
sensing module.
26.6
The capacitive sensing oscillator will continue to run as
long as the module is enabled, independent of the part
being in Sleep. In order for the software to determine if
a frequency change has occurred, the part must be
awake. However, the part does not have to be awake
when the timer resource is acquiring counts.
Note:
Note:
PIC16F/LF1826/27
Operation during Sleep
• AN1101, “Introduction to Capacitive
• AN1102, “Layout and Physical Design
FREQUENCY THRESHOLD
For more information on general capacitive
sensing refer to Application Notes:
Timer0 does not operate when in Sleep,
and
capacitive sense measurements in Sleep.
Sensing” (DS01101)
Guidelines for Capacitive Sensing”
(DS01102)
therefore
cannot
DS41391C-page 319
be
used
for