PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 241
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PIC18F25K80
Manufacturer Part Number
PIC18F25K80
Description
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F25K80.pdf
(628 pages)
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18.0
The Charge Time Measurement Unit (CTMU) is a
flexible analog module that provides accurate differen-
tial time measurement between pulse sources, as well
as asynchronous pulse generation. By working with
other on-chip analog modules, the CTMU can precisely
measure time, capacitance and relative changes in
capacitance or generate output pulses with a specific
time delay. The CTMU is ideal for interfacing with
capacitive-based sensors.
The module includes these key features:
• Up to 11 channels available for capacitive or time
• Low-cost temperature measurement using on-chip
• On-chip precision current source
• Four-edge input trigger sources
• Polarity control for each edge source
FIGURE 18-1:
2011 Microchip Technology Inc.
measurement input
diode channel
CHARGE TIME
MEASUREMENT UNIT (CTMU)
ECCP1
CTED1
CTED2
CCP2
EDGEN
EDGSEQEN
EDG1POL
EDG2POL
EDG1SEL<1:0>
EDG2SEL<1:0>
CTMU BLOCK DIAGRAM
Control
Edge
Logic
EDG1STAT
EDG2STAT
A/D Converter
CTMUCONH:CTMUCONL
Preliminary
Current Source
CTMUICON
Current
Control
PIC18F66K80 FAMILY
Comparator 2
Input
ITRIM<5:0>
IRNG<1:0>
• Control of edge sequence
• Control of response to edges
• Time measurement resolution of 1 nanosecond
• High-precision time measurement
• Time delay of external or internal signal
• Accurate current source suitable for capacitive
The CTMU works in conjunction with the A/D Converter
to provide up to 11 channels for time or charge
measurement, depending on the specific device and
the number of A/D channels available. When config-
ured for time delay, the CTMU is connected to one of
the analog comparators. The level-sensitive input edge
sources can be selected from four sources: two
external inputs or the ECCP1/CCP2 Special Event
Triggers.
The CTMU special event can trigger the Analog-to-Digital
Converter module.
Figure 18-1
asynchronous to system clock
measurement
Comparator 2 Output
provides a block diagram of the CTMU.
Generator
Control
CTMU
Logic
Pulse
TGEN
IDISSEN
CTTRIG
DS39977C-page 241
A/D Trigger
CTPLS
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