○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays

1/36

TSZ02201-0L5L0F300640-1-2

© 2012 ROHM Co., Ltd. All rights reserved.

www.rohm.com

TSZ22111・14・001

14.Jul.2016 Rev.004

Capacitive Controller ICs

Capacitive Switch Controller ICs

BU21072MUV / BU21078MUV / BU21078FV

General Description

BU21072MUV/BU21078MUV/BU21078FV

is a capacitive sensor controller for switch operation.

In addition to a regular simple switch, support matrix

switches which are arranged in the matrix sensors. If

external noise and temperature drift are detected, the

automatic self-calibration is operated.

Include LED controller with PWM function.

Features

■

10 capacitive sensor ports.

(BU21072MUV)

12 capacitive sensor ports.

(BU21078MUV / BU21078FV)

■

Supported Matrix switches.

Maximum 16 switches.

(BU21072MUV)

Maximum 36 switches.

(BU21078MUV / BU21078FV)

■

Automatic self-calibration.

■

Continued touch detection.

■

LED controller with PWM function.

■

Inform the detected result of switch operation by

interrupt.

■

2-wire serial bus interface.

■

Single power supply.

■

Built-in Power-On-Reset and Oscillator.

Applications

■

Appliance that require multiple switches.

■

Information appliance as printer.

■

AV appliance as digital TV and HDD recorder.

■

Notebook PC.

Key Specifications

■

Input voltage range

■

Operating temperature range

■

Operating current

■

Scan rate

3.0 to 5.5V

-20 to 85°C

3.5mA (Typ.)

16msec (Typ.)

Packages

BU21072MUV :

VQFN024V4040

4.00 ㎜×4.00 ㎜×1.00 ㎜

BU21078MUV :

VQFN028V5050

5.00 ㎜×5.00 ㎜×1.00 ㎜

BU21078FV :

SSOP-B28

10.00 ㎜×7.60 ㎜×1.35 ㎜

VQFN024V4040

VQFN028V5050

Typical Application Circuit

VDD

DVDD 1.0uF

VSS

TEST

HOST

SCL

SDA

INT

VDD

VDD

VDD

VDD

(*1) Unused LED pin are OPEN.

(*2) Unused SIN pin are OPEN.

Recommended DT number : DTC143ZE

SIN7 (*2)

SIN6

SIN13

SIN4

SIN3

BU21078

TOP VIEW

1

7

21

15

28

22

8

14

VDD

LED0

SIN14

SIN5

Figure 1. Typical Application Circuit

SSOP-B28