Microchip PIC24FJ256GA410 Manual

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 2011-2016 Microchip Technology Inc. DS30009743B-page 1

HIGHLIGHTS

This section of the manual contains the following major topics:

1.0 Introduction ....................................................................................................................... 2

2.0 Register Maps................................................................................................................... 4

3.0 CTMU Operation............................................................................................................. 10

4.0 Calibrating the CTMU Module......................................................................................... 12

5.0 Measuring Capacitance with the CTMU.......................................................................... 24

6.0 Measuring Time with the CTMU Module......................................................................... 32

7.0 Generating Delays with the CTMU Module..................................................................... 36

8.0 Measuring Temperature with the CTMU ......................................................................... 39

9.0 Operation During Sleep/Idle Modes................................................................................ 44

10.0 Effects of a Reset on CTMU ........................................................................................... 45

11.0 Low-Power Applications for Devices with a CTMREQ Bit .............................................. 45

12.0 Electrical Specifications .................................................................................................. 45

13.0 Related Application Notes............................................................................................... 46

14.0 Revision History .............................................................................................................. 47

Charge Time Measurement Unit (CTMU) and

CTMU Operation with Threshold Detect

dsPIC33/PIC24 Family Reference Manual

DS30009743B-page 2  2011-2016 Microchip Technology Inc.

1.0 INTRODUCTION

The Charge Time Measurement Unit (CTMU) is a flexible analog module that has a configurable

current source with a digital 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,

capacitance, resistance, inductance and temperature measurement. The CTMU can also gener-

ate output pulses with a specific time delay. These measurements can be used in applications

including capacitive touch, humidity sensing and measuring relative changes in capacitance. The

CTMU is ideal for interfacing with capacitive-based sensors.

The module includes the following key features:

• On-chip precision current source

• Sixteen-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 asynchronous to system clock

• Integrated temperature sensing diode

• Control of current source during auto-sampling

• Four current source ranges

• Time measurement resolution of one nanosecond or less

• CTMU operation in Sleep mode

• Relative measurements using Analog-to-Digital Converter Threshold Detect

The CTMU works in conjunction with the A/D Converter for time or charge measurement. When

configured for time delay, the CTMU is connected to one of the analog comparators. The input

edge sources can be selected from up to sixteen sources for each edge. For device-specific

information on available input sources, refer to the appropriate device data sheet.

A block diagram of the CTMU in Measurement mode is shown in Figure 1-1 and in Time Generation

(TGEN) mode in Figure 1-2.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	PIC24FJ256GA410

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