PIC16LF1936-I/MV Microchip Technology, PIC16LF1936-I/MV Datasheet - Page 320
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PIC16LF1936-I/MV
Manufacturer Part Number
PIC16LF1936-I/MV
Description
IC MCU 8BIT 14KB FLASH 28UQFN
Manufacturer
Microchip Technology
Series
PIC® XLP™ 16Fr
Datasheet
1.PIC16F1937-EMV.pdf
(472 pages)
Specifications of PIC16LF1936-I/MV
Core Processor
PIC
Core Size
8-Bit
Speed
32MHz
Connectivity
I²C, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
25
Program Memory Size
14KB (8K x 14)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-UFQFN Exposed Pad
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
PIC16LF1936-I/MV
Manufacturer:
ATMEL
Quantity:
3 200
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PIC16(L)F1934/6/7
26.1
The CPS module can monitor up to 16 inputs. The
capacitive sensing inputs are defined as CPS<15:0>.
To determine if a frequency change has occurred the
user must:
• Select the appropriate CPS pin by setting the
• Set the corresponding ANSEL bit.
• Set the corresponding TRIS bit.
• Run the software algorithm.
Selection of the CPSx pin while the module is enabled
will cause the capacitive sensing oscillator to be on the
CPSx pin. Failure to set the corresponding ANSEL and
TRIS bits can cause the capacitive sensing oscillator to
stop, leading to false frequency readings.
26.2
The capacitive sensing oscillator consists of a constant
current source and a constant current sink, to produce
a triangle waveform. The CPSOUT bit of the
CPSCON0 register shows the status of the capacitive
sensing oscillator, whether it is a sinking or sourcing
current. The oscillator is designed to drive a capacitive
load (single PCB pad) and at the same time, be a clock
source to either Timer0 or Timer1. The oscillator has
three different current settings as defined by
CPSRNG<1:0> of the CPSCON0 register. The different
current settings for the oscillator serve two purposes:
• Maximize the number of counts in a timer for a
• Maximize the count differential in the timer during
26.3
The capacitive sensing oscillator uses voltage refer-
ences to provide two voltage thresholds for oscillation.
The upper voltage threshold is referred to as Ref+ and
the lower voltage threshold is referred to as Ref-.
The V
(Ref-) and the V
threshold level (Ref+).
DS41364E-page 320
CPSCH<3:0> bits of the CPSCON1 register.
fixed time base.
a change in frequency.
SS
Analog MUX
Capacitive Sensing Oscillator
Voltage References
voltage determines the lower threshold level
DD
voltage determines the upper
26.4
The capacitive sensing oscillator can operate in one of
three different power modes.
There are three distinct power ranges; low, medium and
high. Current consumption is dependent upon the range
selected. See
selection.
The remaining mode is a Noise Detection mode that
resides within the high range. The Noise Detection
mode is unique in that it disables the sinking and sourc-
ing of current on the analog pin but leaves the rest of
the oscillator circuitry active. This reduces the oscilla-
tion frequency on the analog pin to zero and also
greatly reduces the current consumed by the oscillator
module.
When noise is introduced onto the pin, the oscillator is
driven at the frequency determined by the noise. This
produces a detectable signal at the comparator output,
indicating the presence of activity on the pin.
Figure 26-2
current sources and comparators associated with the
oscillator.
TABLE 26-1:
CPSRNG<1:0>
Note 1: See the applicable Electrical Specifica-
00
01
10
11
Power Ranges
tions Chapter for more information.
shows a more detailed drawing of the
Table 26-1
POWER RANGE SELECTION
2008-2011 Microchip Technology Inc.
Medium
Mode
High
Low
Off
for proper power range
Nominal Current
0.0 A
0.1 A
1.2 A
18 A
(1)
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