LC717A30UJ-AH Datasheet LC717A30UJ-AH | P1-P3

December - Rev. 0 LC717A30UJ/D

LC717A30UJ

Capacitance-Digital-Converter LSI

for Electrostatic Capacitive Touch

Sensors

The LC717A30UJ is a high performance, low cost, and highly

usable capacitance converter for electrostatic capacitive touch and

proximity sensors.

8 capacitance-sensing input channels ideal for use in any end

products that needs an array of switches. The LC717A30J

facilitates a short system development time through its automatic

calibration function and minimal external components. The

detection result (ON/OFF) for each sensor is read out by the serial

interface (I

2

C or SPI).

Features

 Differential capacitive detection using mutual capacitance.

 Operates with small to large capacitance sensor input pads.

 Capacitance detection down to femto-Farad level.

 Measurement time 16 ms for 8 sensors.

 Minimal external components.

 Selectable interface : I²C or SPI.

 Current consumption : 0.8 mA (V

DD

= 5.5 V)

 Supply voltage : 2.6 V to 5.5 V

 AEC-Q100 qualified and PPAP capable.

Typical Applications

 Automotive : Smart key, Control switches, Car audio, Proximity

 Consumer : Home Appliance, White goods, Induction Cooking

 Industrial : Security lock

 Computing : PC Peripherals, Audio Visual equipment

 Lighting : Remote control switches

Figure 1. Application Schematic 1

www.onsemi.com

SSOP30 (225mil)

8.0 x 6.4 x 1.6 mm

MARKING DIAGRAM

XXXXX = Specific Device Code

Y = Year

M = Month

DDD = Additional Traceability Data

ORDERING INFORMATION

Ordering Code:

LC717A30UJ-AH

Package:

SSOP30 (225mil)

(Pb-Free / Halogen Free)

Shipping (Qty / Packing):

1000 / Tape & Reel

† For information on tape and reel specifications, including part

orientation and tape sizes, please refer to our Tape and Reel

Packaging Specifications Brochure, BRD8011/D.

http://www.onsemi.com/pub_link/Collateral/BRD8011-D.PDF

Cref CrefAdd

CdrvBar

CMAdd0

CMAdd4

Cin0

Cin1

Cin6

Cin7

Cdrv

SW1

SW2

SW7

SW8

Main

microcomputer

nCS

SCL/SCK

SDA/SI

SA0/SO

nRST

INTOUT

IFSEL

GPIO

EXTINT

I

2

C/SPI

Cref

V

DD

or V

SS

LC717A30UJ

XXXXXXXXXX

YMDDD

LC717A30UJ

www.onsemi.com

2

8 small capacitance sensors channels and 4-wire SPI interface.

Figure 2. Application Schematic 2

8 Large capacitance sensors and I

2

C interface.

Figure 3. Application Schematic 3

LC717A30UJ

CdrvBar

CMAdd0

CMAdd4

Cin0

Cin1

Cin2

Cin3

Cin4

Cin5

Cin6

Cin7

Cdrv

Main

microcomputer

nCS

SCL/SCK

SDA/SI

SA0/SO

nRST

INTOUT

IFSEL

GPIO

EXTINT

SW1 (Big capacitance : e.g. 20 pF)

SW2 (Big capacitance : e.g. 20 pF)

SW3 (Big capacitance : e.g. 20 pF)

SW4 (Big capacitance : e.g. 20 pF)

SW5 (Big capacitance : e.g. 20 pF)

SW6 (Big capacitance : e.g. 20 pF)

SW7 (Big capacitance : e.g. 20 pF)

SW8 (Big capacitance : e.g. 20 pF)

VDD

LC717A30UJ

Cref CrefAdd

CdrvBar

CMAdd0

CMAdd4

Cin0

Cin1

Cin2

Cin3

Cin4

Cin5

Cin6

Cin7

Cdrv

Main

microcomputer

nCS

SCL/SCK

SDA/SI

SA0/SO

nRST

INTOUT

IFSEL

GPIO

EXTINT

SW1 (Small capacitance : e.g. 4 pF)

SW2 (Small capacitance : e.g. 4 pF)

SW3 (Small capacitance : e.g. 4 pF)

SW4 (Small capacitance : e.g. 4 pF)

4 pF

SW5 (Small capacitance : e.g. 4 pF)

SW6 (Small capacitance : e.g. 4 pF)

SW7 (Small capacitance : e.g. 4 pF)

SW8 (Small capacitance : e.g. 4 pF)

(open)

16 pF

20 pF

16 pF

VDD

(open)

Cref CrefAdd

LC717A30UJ

www.onsemi.com

3

BLOCK DIAGRAM

The LC717A30UJ is a capacitance-digital converter LSI

that can detect capacitance at the femto farad level. It

consists a multiplexer that selects the input channels, a

two-stage amplifier that detects the changes in the

capacitance and outputs analog-amplitude values, an

A/D converter, a system clock, a power-on reset circuit,

control logic and interface, I

2

C bus or SPI.

Figure 4. Simplified Block Diagram

POWER

ON

RESET

nRST

INTOUT

nCS

Cdrv

OSCILLATOR

SCL/SCK

SDA/SI

SA0/SO

A/D

CONVERTER

2nd

AMP

1st

AMP

V

SS

V

DD

Cin3

Cin1

Cin6

Cin0

Cin7

Cin2

Cin5

Cin4 MUX

-

+

-

+

CdrvBa

r

IFSEL

Tout0

Tout1

Tout2

Tout3

Cref

CrefAdd

MUX

CMAdd0

CMAdd4

CONTROL LOGIC

I

2

C/SPI

INTERFACE

Tout4

LC717A30UJ-AH

LC717A30UJ-AH

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