Cmsemicon SC7020 Series User manual

SC7020x User Manual

Low power single touch single output IC

Rev. 1.1

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* Our company preserve the rights to further elaborate on the improvements about product functions, reliability and design in

this manual. However, our company is not responsible for any usage about this manual. The applications and their purposes in

this manual are just for clarification, our company does not guarantee that these applications are feasible without further

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endangered during accident. Our company’s products are not authorized to be used for life-saving or life support devices and

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Please be reminded about following CMS’s policies on intellectual property

2 / 12

SC7020x

www.mcu.com.cn

Rev. 1.1

Manual

1. PRODUCT DESCRIPTION ...................................................................................................3

2. CHARACTERISTIC...............................................................................................................3

3. PRODUCT SPECIFICATION ................................................................................................3

4. SYSTEM STRUCTURE DIAGRAM.......................................................................................4

5. PACKAGING AND PIN DESCRIPTION................................................................................5

5.1 SC70201, SC70202 Pin Diagram ..............................................................................................................................5

5.2 SC70205 Pin Diagram................................................................................................................................................6

6. FUNCTION DESCRIPTION...................................................................................................7

6.1 Output Mode and Pad Option .....................................................................................................................................7

6.2 Maximum output time of key.......................................................................................................................................7

6.3 Low Power Mode ........................................................................................................................................................7

6.4 Sensitivity adjustment .................................................................................................................................................8

7. APPLICATION CIRCUIT.......................................................................................................9

8. ELECTRICAL CHARACTERISTICS...................................................................................10

8.1 Limit Parameters of Electrical Characteristics...........................................................................................................10

8.2 DC Characteristics....................................................................................................................................................10

9. PACKAGING.......................................................................................................................11

9.1 SOT23-6 ...................................................................................................................................................................11

10. VERSION REVISION..................................................................................................12

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SC7020x

www.mcu.com.cn

Rev. 1.1

1. Product Description

SC7020x is a touch pad detector IC which offers 1 touch key. The device built-in voltage regulator

circuit to provide a stable voltage for the touch sensing circuit, while the internal integration of efficient and

perfect touch detection algorithm, so that the chip has a stable touch detection effect. The touching

detection IC is designed for replacing traditional direct button key with wide operating voltage and low power

consumption, which can widely meet the needs of different consumer applications

2. Characteristic

◆Working voltage: 2.4~5.5V

◆Working temperature: -40~85℃

◆Excellent anti-interference performance: built-in voltage regulator circuit, power-on reset, low-voltage

reset function and environment adaptive algorithm and other measures

◆Low power standby current: Typical value 0.8uA@VDD=3V/no load

◆The key response time max about 220mS at low power mode @VDD=3V

◆Sensitivity can adjust by the capacitance（3~50pF）outside

◆Output type selection（TOG）: synchronous output or toggle output

◆Output optional CMOS output (QC) or Open drain output (QD)

◆Maximum output time of key: 8 s/16 s/64s~ infinity（±30%）

◆After power-on have about 0.4s stable-time, during the time do not touch the key pad, and the

function is disabled

◆the function is disabled HBM ESD: more than 5KV

◆Packaging: SOT23-6

3. Product Specification

Maximum output time

Output type

Product

infinity

16s

64s

Push-pull

output

Open drain

output

SC70201

■

SC70202

■

SC70205

■

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SC7020x

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Rev. 1.1

4. System Structure Diagram

Sensor

oscillator circuit

Sensor &

Reference

detecting circuit

Timing counter

& function

option control

circuit

System

oscillator circuit

Regulator

circuit

Touch

detecting circuit

Key-on &

Timing control

Output &

Driver circuit

QC/QD

TOG

AHLB

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SC7020x

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Rev. 1.1

5. Packaging and Pin Description

5.1 SC70201, SC70202 Pin Diagram

SC70201

SC70202

GND

TOG

VDD

AHLB

Pin Description:

Pad

Pin name

I/O type

description

CMOS output pin

GND

Negative power supply, ground

Touch key sensor input pin

AHLB

I-PL

Output QC active high or low selection

0(Default):Active high; 1:Active low

VDD

Positive power supply

TOG

I-PL

Output type selection 0 (Default): synchronous output; 1: toggle output

Pin Type:

◆I

CMOS input

◆P

Power／Ground

◆O

CMOS output

◆I-PH

CMOS input and pull-high resister

◆I/O

CMOS I/O

◆I-PL

CMOS input and pull-low resister

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SC7020x

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Rev. 1.1

5.2 SC70205 Pin Diagram

SC70205

GND

TOG

VDD

AHLB

Pin Description:

Pad

Pin name

I/O type

description

Open drain output pin

GND

Negative power supply, ground

Touch key sensor input pin

AHLB

I-PL

Output QC active high or low selection

0(Default):Active high; 1:Active low

VDD

Positive power supply

TOG

I-PL

Output type selection 0 (Default): synchronous output; 1: toggle output

Pin Type:

◆I

CMOS input

◆P

Power／Ground

◆OD

Open drain output

◆I-PH

CMOS input and pull-high resister

◆I/O

CMOS I/O

◆I-PL

CMOS input and pull-low resister

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SC7020x

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Rev. 1.1

6. Function Description

6.1 Output Mode and Pad Option

The AHLB and TOG pads are latches: The default status is low. If the pads are connected to VDD

before power-on, the status changes to high after power-on, and no current leakage occurs.

TOG pad: Synchronous output or toggle output selection.

AHLB pad: Output CMOS active high or active low selection.

Pad QC (CMOS output) option features:

TOG

AHLB

Pad QC/QD features

Synchronous output, CMOS active high

Synchronous output, CMOS active low

Toggle output, power on state = 0

Toggle output, power on state = 1

6.2 Maximum output time of key

Objects covering the touchpad or sudden changes in the environment may cause touch detection to

remain active. The system will return to the initial state of power-on and the output will become invalid, when

the IC's internal touch algorithm detects that the output valid duration reaches the set value of 8s/16s/64s

(±30%).

6.3 Low Power Mode

SC7020x in the Low Power mode it will be saving power. In this mode when detecting key touch, it will

switch to Fast mode. Until the key touch is released and will keep a time about 10 s. Then it returns to Low

Power mode.

Low Power

mode timing Fast mode timing Low Power

mode timing

-125ms -16ms -125ms -16ms ABOUT 10 SEC -125ms

POSSIBLE KEY TOUCH KEY RELEASE

(NOT REALLY TOUCH) KEY TOUCH KEY RELEASE

QCVDD

VSS

TK VDD

VSS

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SC7020x

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Rev. 1.1

6.4 Sensitivity adjustment

The equivalent capacitance on the IC touch pad will affect the sensitivity. So the sensitivity adjustment

must according to the practical application on PCB. The SC7020x offers some methods for adjusting the

sensitivity outside.

1) By the touchpad size: Under other conditions are fixed. Using a larger touchpad size can increase

sensitivity. Otherwise it can decrease sensitivity. But the touchpad size must use in the effective

scope.

2) By the panel thickness: Under other conditions are fixed. Using a thinner panel can increase

sensitivity. Otherwise it can decrease sensitivity.

3) By the value of Cs: Under other conditions are fixed. When the touchpad is not use the Cs to GND,

the sensitivity is most sensitive. When adding the value of Cs will reduce sensitivity in the useful

range（3≦Cs≦50pF）.

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SC7020x

www.mcu.com.cn

Rev. 1.1

7. Application circuit

QC/QD

GND

TOG

VDD

AHLB

4VDD

VDD VDD

0.1uF

GND

R2 0

TP1

SC7020x

Figure 7-1: Schematic diagram of the circuit

Note:

1) On PCB, the length of lines from touch pad to IC pin shorter is better. And the lines do not parallel

and cross with other lines.

2) The power supply must be stable. If the supply voltage drift or shift quickly, maybe causing

sensitivity anomalies or false detections.

3) The material of panel covering on the PCB can not include the metal or the electric element. The

paints on the surfaces are the same.

4) The C1 capacitor (104 or larger) must be used between VDD and GND; and should be routed with

very short tracks to the device’s VDD and GND pins.

5) The capacitance Cs can be used to adjust the sensitivity. The value of Cs uses smaller, then the

sensitivity will be better. The sensitivity adjustment must according to the practical application on

PCB. The range of Cs value are 3~50pF.

6) The sensitivity adjustment capacitors（Cs）must use smaller temperature coefficient and more

stable capacitors. Such are X7R, NPO for example. So for touch application, recommend to use

NPO capacitor, for reducing that the temperature varies to affect sensitivity.

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SC7020x

www.mcu.com.cn

Rev. 1.1

8. Electrical Characteristics

8.1 Limit Parameters of Electrical Characteristics

Limit Parameters

Parameter

Symbol

Conditions

Rating

Unit

Supply Voltage

VDD

-0 to +5.5

Input Voltage

All I/O port

-0.3 to VDD+0.3

Working temperature

-40~ +85

℃

Storage Temperature

TSTG

-50~ +125

℃

Human Body Mode

ESD

8.2 DC Characteristics

（VDD=2.0V~5.5, TA= 25℃, unless otherwise indicated）

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Working voltage

VDD

2.4

5.5

Internal Regulator Output

VREG

2.0

2.2

2.4

High level input voltage

VIH

0.75

1.0

VDD

Low level input voltage

VIL

0.25

VDD

Output Port Source Current

IOH

VDD=3V, VOH=2.1V

-9

Output Port Sink Current

IOL

VDD=3V, VOL=0.9V

Input Pin Pull-low Resistor

RPL

VDD=3V（TOG, AHLB）

55K

ohm

Output Response Time

VDD=3V, At fast mode

VDD=3V, At low power mode

200

Working current

ISB

VDD=3V, At low power mode

(no load)

0.8

1.5

μA

VDD=3V, At fast mode(no load)

1.6

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