PIC16F1939-I/PT Microchip Technology Inc., PIC16F1939-I/PT Datasheet - Page 317

• Manufacturer Part Number: PIC16F1939-I/PT
• Description: 44 TQFP 10x10x1mm TRAY, 28KB Flash, 1KB RAM, 256B EEPROM, LCD, 1.8-5.5V
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F1939-I/PT

• A/d Inputs: 14-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 8 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 36
• Interface: I2C/SPI/UART/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 40-pin TQFP
• Programmable Memory: 28K Bytes
• Ram Size: 1K Bytes
• Speed: 32 MHz
• Temperature Range: –40 to 125 °C
• Timers: 4-8-bit, 1-16-bit
• Voltage, Range: 1.8-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

25.0
The capacitive sensing module allows for an interaction
with an end user without a mechanical interface. In a
typical application, the capacitive sensing module is
attached to a pad on a Printed Circuit Board (PCB),
which is electrically isolated from the end user. When the
end user places their finger over the PCB pad, a
capacitive load is added, causing a frequency shift in the
capacitive sensing module. The capacitive sensing
module requires software and at least one timer
resource to determine the change in frequency. Key
features of this module include:
• Analog MUX for monitoring multiple inputs
• Capacitive sensing oscillator
• Multiple Power modes
• High power range with variable voltage references
• Multiple timer resources
• Software control
• Operation during Sleep
FIGURE 25-1:
 2009 Microchip Technology Inc.
(PIC16F/LF1933/1938/1939 only)
CPS10
CPS11
CPS12
CPS13
CPS14
CPS15
CPS8
CPS9
Note 1:
CPS0
CPS1
CPS2
CPS3
CPS4
CPS5
CPS6
CPS7
CAPACITIVE SENSING
MODULE
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
2:
3:
4:
Reference CPSCON1 register (Register 25-2) for channels implemented on each device.
CPSCH3 is not implemented on PIC16F1933/1936/1938/PIC16LF1933/1936/1938.
If CPSON = 0, disabling capacitive sensing, no channel is selected.
Variable Voltage Reference selection is implemented on PIC16F/LF1934/1936/1937 only.
CAPACITIVE SENSING BLOCK DIAGRAM
CPSON
CPSCH<3:0>
Ref-
(3)
0
1
CPSRM
Capacitive
Oscillator
CPSOSC
Sensing
DAC
Ref+
(2)
CPSRNG<1:0>
(4)
(4)
CPSON
0
1
FVR
Ref.
Int.
(4)
T0CKI
Preliminary
T0XCS
CPSOUT
CPSCLK
0
1
PIC16F193X/LF193X
F
OSC
SYNCC1OUT
SYNCC2OUT
T1GSEL<1:0>
T1CS<1:0>
/4
T1OSC/
F
F
T1G
OSC
T1CKI
OSC
0
1
/4
TMR0CS
Timer0 Module
TMR0
Timer1 Module
Control Logic
Timer1 Gate
EN
TMR1H:TMR1L
Overflow
DS41364D-page 317
TMR0IF
Set