PIC24F08KA102-E/ML Microchip Technology, PIC24F08KA102-E/ML Datasheet - Page 187
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PIC24F08KA102-E/ML
Manufacturer Part Number
PIC24F08KA102-E/ML
Description
8KB Flash, 1.5KB RAM, 512B EEPROM, 16 MIPS, 24 I/O,16-bit PIC24F Family, NanoWat
Manufacturer
Microchip Technology
Series
PIC® XLP™ 24Fr
Datasheet
1.MA240017.pdf
(254 pages)
Specifications of PIC24F08KA102-E/ML
Core Processor
PIC
Core Size
16-Bit
Speed
32MHz
Connectivity
I²C, IrDA, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
24
Program Memory Size
8KB (2.75K x 24)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 9x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
Processor Series
PIC24F
Core
PIC
3rd Party Development Tools
52713-733, 52714-737, 53276-922, EWDSPIC
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, DM240001
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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25.0
The Charge Time Measurement Unit (CTMU) is a
flexible analog module that provides charge measure-
ment, accurate differential time measurement between
pulse sources and asynchronous pulse generation. Its
key features include:
• Four edge input trigger sources
• Polarity control for each edge source
• Control of edge sequence
• Control of response to edges
• Time measurement resolution of one nanosecond
• Accurate current source suitable for capacitive
Together with other on-chip analog modules, the CTMU
can be used to precisely measure time, measure
capacitance, measure relative changes in capacitance,
or generate output pulses that are independent of the
system clock. The CTMU module is ideal for interfacing
with capacitive-based touch sensors.
The CTMU is controlled through two registers,
CTMUCON and CTMUICON. CTMUCON enables the
module, and controls edge source selection, edge
source polarity selection, and edge sequencing. The
CTMUICON register selects the current range of
current source and trims the current.
FIGURE 25-1:
© 2009 Microchip Technology Inc.
Note:
measurement
CHARGE TIME
MEASUREMENT UNIT (CTMU)
This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information on the
Charge Measurement Unit, refer to the
“PIC24F
Section 11. “CTMU” (DS39724).
Family
TYPICAL CONNECTIONS AND INTERNAL CONFIGURATION FOR
CAPACITANCE MEASUREMENT
C
APP
Reference
ANx
AN
R
PR
Y
Manual”,
Preliminary
PIC24F16KA102 FAMILY
EDG2
EDG1
PIC24F Device
A/D Converter
25.1
The
generating an output pulse with a width equal to the
time between edge events on two separate input
channels. The pulse edge events to both input
channels can be selected from four sources: two
internal peripheral modules (OC1 and Timer1) and two
external pins (CTEDG1 and CTEDG2). This pulse is
used with the module’s precision current source to
calculate capacitance according to the relationship:
For capacitance measurements, the A/D Converter
samples an external capacitor (C
input channels after the CTMU output’s pulse. A
precision resistor (R
calibration on a second A/D channel. After the pulse
ends, the converter determines the voltage on the
capacitor. The actual calculation of capacitance is
performed in software by the application.
Figure 25-1 displays the external connections used for
capacitance measurements, and how the CTMU and
A/D modules are related in this application. This
example also shows the edge events coming from
Timer1, but other configurations using external edge
sources are possible. A detailed discussion on
measuring capacitance and time with the CTMU
module is provided in the “PIC24F Family Reference
Manual”.
Timer1
CTMU
Current Source
CTMU
Output Pulse
Measuring Capacitance
module
C
PR
=
measures
) provides current source
I
⋅
dV
------ -
dT
APP
DS39927B-page 185
capacitance
) on one of its
by
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