GPM8F372A Capacitive Touch Sensor Slider Key of LED Lamp

GPM8F372A Capacitive Touch Sensor Slider Key of LED Lamp Nov. 12, 2014 Preliminary Version 0.1 No.19, Industry E. Rd. IV, Hsinchu Science Park, Hsinc...
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GPM8F372A Capacitive Touch Sensor Slider Key of LED Lamp Nov. 12, 2014 Preliminary Version 0.1

No.19, Industry E. Rd. IV, Hsinchu Science Park, Hsinchu City 30077, Taiwan, R.O.C. Tel: 886-3-666-2118 Fax: 886-3-666-2117

Web: www.generalplus.com

GPM8F372A User’s Manual

Important Notice GENERALPLUS TECHNOLOGY INC. reserves the right to change this documentation without prior notice. Information provided by GENERALPLUS TECHNOLOGY INC. is believed to be accurate and reliable. However, GENERALPLUS TECHNOLOGY INC. makes no warranty for any errors which may appear in this document. Contact GENERALPLUS TECHNOLOGY INC. to obtain the latest version of device specifications before placing your order.

No responsibility is

assumed by GENERALPLUS TECHNOLOGY INC. for any infringement of patent or other rights of third parties which may result from its use.

In addition, GENERALPLUS products are not authorized for use as critical components in life support

systems or aviation systems, where a malfunction or failure of the product may reasonably be expected to result in significant injury to the user, without the express written approval of Generalplus.

© Generalplus Technology Inc.

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GPM8F372A User’s Manual

Table of Contents PAGE CAPACITIVE TOUCH SENSOR SLIDER KEY OF LED LAMP.............................................................................................. 5 1.1 GENERAL DESCRIPTION .......................................................................................................................................... 5 1.2 FEATURES ................................................................................................................................................................. 5 1.3 PIN CONFIGURATION................................................................................................................................................ 6 1.3.1 Pin Description................................................................................................................................................... 6 1.3.2 Pin Assignment .................................................................................................................................................. 6 1.3.3 Application Circuit .............................................................................................................................................. 6 1.4 APPLICATION SPECIFICATION ................................................................................................................................. 9 1.4.1 DC Characteristics (VDD = 5V, TA = 25℃) ........................................................................................................ 9 1.4.2 AC Characteristics (TA = 25℃) .......................................................................................................................... 9 1.5 PACKAGE ................................................................................................................................................................. 10

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GPM8F372A User’s Manual

REVISION HISTORY Version

Date

By

0.1

2014/11/12

henryhsieh

© Generalplus Technology Inc.

Remark Preliminary Version

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GPM8F372A User’s Manual

CAPACITIVE TOUCH SENSOR SLIDER KEY OF LED LAMP 1.1

GENERAL DESCRIPTION

GPM8F372A is a capacitive touch sensor with SOC integrated serving as a detecting the change which examine the electric capacity and forming it to export through judging.

1.2

FEATURES

● Internal oscillator 16MHz ±2% ● I/O port with 12mA current sink or drive ● High noise immunity

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GPM8F372A User’s Manual 1.3

PIN CONFIGURATION

1.3.1

Pin Description

SOP16: Pin No

Name

Type

Description

1

VSS

PWR

System ground

2

VDD

PWR

System Power

3

T0

I

Capacitive toucch sensor pin 0

4

T1

I

Capacitive toucch sensor pin 1

5

T2

I

Capacitive toucch sensor pin 2

6

T3

I

Capacitive toucch sensor pin 3

7

T4

I

Capacitive toucch sensor pin 4

8

T5

I

Capacitive toucch sensor pin 5

9

T6

I

Capacitive toucch sensor pin 6

10

T7

I

Capacitive toucch sensor pin 7

11

NC

--

Keep NC

12

PWM

O

PWM control pin

13

NC

--

Keep NC

14

Control signal

I

Feedback pin

15

TEST1

I/O

Test pin1

16

TEST2

I/O

Test pin2

1.3.2

Pin Assignment

Figure 1 GPM8F372A IC Package

1.3.3

Application Circuit

VPP

12V-18V (reference to rated voltage of the parts)

Load current(Target current)

30mA -1A

Touch Slider segment value

1~30

PFM freq

MAX 80KHz

Mark/Space freq

200Hz

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TOUCH00-TOUCH07

GPM8F372A User’s Manual

Figure 2 Application circuit

First, we use PFM to track the fix current, which is the maximum current in the system. Second, we can adopt touch slider panel to determine target current and adjust Mark/Space duty to achieve the target current, and at the same time, we detect the current by Feedback signal. Figure 2 Application circuitshows the application circuit and the above table shows application circuit specification.

Both Figure 3 Application circuit and Figure 4 show the Feedback(Ch1), Control

signal(CH2) and load current(Ch3) signals. Figure 2 Application circuitand Figure 6 are the load characteristic curve with different VPP.

Figure 4 Application circuit signals

Figure 3 Application circuit signals

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GPM8F372A User’s Manual

400 Load current(mA)

350 300 250 200 150 100 50 0 12

13

14

15

16

17

18

VPP(V) Figure 5 Load current characteristic curve with different VPP

90.00%

Efficiency

85.00% 80.00% 75.00% 70.00% 12

13

14

15

16

17

18

VPP(V) Figure 6 Load efficiency characteristic curve with different VPP

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GPM8F372A User’s Manual 1.4

APPLICATION SPECIFICATION

1.4.1

DC Characteristics (VDD = 5V, TA = 25℃)

Characteristics Operating Voltage Operating Current

Symbol

Limit

Unit Condition

Min.

Typ.

Max.

VDD

3.5

5

5.5

V

IOP

-

5

8

mA

No load at VDD = 5.0V

Standby Current

ISTBY

-

-

8.0

uA

VDD = 5.0V

Input High Level

VIH

0.7VDD

-

-

V

VDD = 5.0V

Input Low Level

VIL

-

-

0.3VDD

V

VDD = 5.0V

Output High Level

VOH

0.8VDD

-

-

V

IOH > -12mA at VDD = 5.0V

Output Low Level

VOL

-

-

0.2VDD

V

IOL > 12mA at VDD = 5.0V

1.4.2

AC Characteristics (TA = 25℃)

Characteristics INOSC Frequency

© Generalplus Technology Inc.

Symbol FOSC

Limit Min.

Typ.

16×(1-2.0%)

16

9

Max.

Unit Condition

16×(1+2.0%) MHz VDD = 3.5~5.5V

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GPM8F372A User’s Manual 1.5

PACKAGE

© Generalplus Technology Inc.

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