PIC32MX230F128L-I/PF View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC32MX230F128L-I/PF

32-bit Microcontrollers (up to 512 KB Flash and 64 KB SRAM) with Audio/Graphics/Touch (HMI), CAN, USB, and Advanced Analog

Microchip Technology 

PIC32MX1XX/2XX/5XX 64/100-PIN FAMILY

26.0 CHARGE TIME

MEASUREMENT UNIT (CTMU)

Note:

This data sheet summarizes the features

of the PIC32MX1XX/2XX/5XX 64/100-pin

family of devices. It is not intended to be

a comprehensive reference source. To

complement the information in this data

sheet, refer to Section 37. “Charge

Time Measurement Unit (CTMU)”

(DS60001167) in the “PIC32 Family

Reference Manual”, which is available

from the Microchip web site

(www.microchip.com).

The Charge Time Measurement Unit (CTMU) is a

flexible analog module that has a configurable current

source with a digital configuration circuit built around it.

The CTMU can be used for differential time

measurement between pulse sources and can be used

for generating an asynchronous pulse. By working with

other on-chip analog modules, the CTMU can be used

for high resolution time measurement, measure

capacitance, measure relative changes in capacitance

or generate output pulses with a specific time delay.

The CTMU is ideal for interfacing with capacitive-based

sensors.

The CTMU module includes the following key features:

• Up to 13 channels available for capacitive or time

measurement input

• On-chip precision current source

• 16-edge input trigger sources

• Selection of edge or level-sensitive inputs

• Polarity control for each edge source

• Control of edge sequence

• Control of response to edges

• High precision time measurement

• Time delay of external or internal signal asynchro-

nous to system clock

• Integrated temperature sensing diode

• Control of current source during auto-sampling

• Four current source ranges

• Time measurement resolution of one nanosecond

A block diagram of the CTMU is shown in Figure 26-1.

FIGURE 26-1:

CTED1

•

•

•

CTED13

Timer1

OC1

IC1-IC3

CMP1-CMP2

PBCLK

CTMU BLOCK DIAGRAM

CTMUCON1 or CTMUCON2

CTMUICON

ITRIM<5:0>

IRNG<1:0>

Current Source

Edge

Control

Logic

EDG1STAT

EDG2STAT

Current

Control

TGEN

CTMU

Control

Logic

CTMUT

(To ADC)

Temperature

Sensor

CTMUP

CTMUI

(To ADC S&H capacitor)

C2INB

Pulse

Generator

CDelay

External capacitor

for pulse generation

Comparator 2

ADC

Trigger

CTPLS

Current Control Selection

CTMUT

CTMUI

CTMUP

No Connect

TGEN

0

0

1

1

EDG1STAT, EDG2STAT

EDG1STAT = EDG2STAT

EDG1STAT  EDG2STAT

EDG1STAT  EDG2STAT

EDG1STAT = EDG2STAT

 2014-2017 Microchip Technology Inc.

DS60001290E-page 279

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