MA330026 Microchip Technology, MA330026 Datasheet - Page 223

• Manufacturer Part Number: MA330026
• Description: Daughter Cards & OEM Boards dsPIC33FJ16MC102 Plug-In Module
• Manufacturer: Microchip Technology

Specifications of MA330026

• Rohs: yes
• Product: Plug-In Modules
• Core: PIC
• Data Bus Width: 16 bit
• Description/function: dsPIC33F MC 28 Pin QFN to 100 Pin Plug-in-Module
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 3 V to 3.6 V
• For Use With: DM330021, DM330022, DM330023

22.0
The Charge Time Measurement Unit (CTMU) is a flex-
ible analog module that provides accurate differential
time measurement between pulse sources, as well as
asynchronous pulse generation. Its key features
include:
FIGURE 22-1:
© 2011 Microchip Technology Inc.
dsPIC33FJ16GP101/102 AND dsPIC33FJ16MC101/102
Note 1: This data sheet summarizes the features
2: Some registers and associated bits
CHARGE TIME
MEASUREMENT UNIT (CTMU)
CTED1
CTED2
Timer1
CMP2
OC1
of the dsPIC33FJ16GP101/102 and
dsPIC33FJ16MC101/102
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 55. “Charge
Time
(DS70635) in the “dsPIC33F/PIC24H
Family Reference Manual”, which is
available on the Microchip web site
(www.microchip.com).
described in this section may not be
available on all devices. Refer to
Section 4.0 “Memory Organization”
this data sheet for device-specific register
and bit information.
IC1
Measurement
CTMU TEMP
CTMU BLOCK DIAGRAM
Temperature
CTMU TEMP
CTMUI
CTMUP
No Connect
Current Control Selection
Control
Sensor
Edge
Logic
CTMU
Unit
family
EDG1STAT
EDG2STAT
(CTMU)”
for pulse generation
External capacitor
CTMUCON1 or CTMUCON2
CTMUI to ADC
CDelay
C2INA
Preliminary
of
in
Current Source
CTMUICON
Current
Control
TGEN
0
0
1
1
ITRIM<5:0>
IRNG<1:0>
CTMUP
• Four edge input trigger sources
• Polarity control for each edge source
• Control of edge sequence
• Control of response to edges
• Precise time measurement resolution of 200 ps
• Accurate current source suitable for capacitive
• On-chip temperature measurement using a
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 capaci-
tive-based sensors.The CTMU is controlled through
three
CTMUICON. CTMUCON1 enables the module, the
Edge delay generation, sequencing of edges and con-
trols the current source and the output trigger.
CTMUCON2 controls the edge source selection, edge
source polarity selection and edge sampling mode. The
CTMUICON register controls the selection and trim of
the current source.
Figure 22-1
measurement
built-in diode
EDG1STAT = EDG2STAT
EDG1STAT ≠ EDG2STAT
EDG1STAT ≠ EDG2STAT
EDG1STAT = EDG2STAT
EDG1STAT, EDG2STAT
TGEN
Comparator 2
registers:
shows the CTMU block diagram.
Generator
Control
CTMU
Logic
Pulse
CTMUCON1,
Analog-to-Digital
CTPLS
Trigger
CTMUCON2
DS70652C-page 223
and