Switch Controller. BU21181FS Datasheet

BU21181FS Controller. Datasheet pdf. Equivalent

Part BU21181FS
Description Capacitive Switch Controller
Feature Datasheet Capacitive Switch Controller ICs Capacitive Switch Controller IC BU21181FS General Desc.
Manufacture ROHM
Datasheet
Download BU21181FS Datasheet



BU21181FS
Datasheet
Capacitive Switch Controller ICs
Capacitive Switch Controller IC
BU21181FS
General Description
BU21181FS is a capacitive switch controller that detects
capacitance change and judges the operation of Switch
ON / OFF or Long Press. The function to prevent false
detection of water enables it to be used at places using
water.
Features
18 Capacitive Sensor Pins
Switch ON / OFF / Long Press Detection
Inform Detection Results by Interrupt Pin
Prevention False Detection by Water
Noise Calibration Function
Drift Calibration Function
Adjust Sampling Period Function
2-wire Serial Bus Interface
Single Power Supply
Key Specifications
Power Supply Voltage Range:
Operating Temperature Range:
Operating Current:
3.0 V to 5.5 V
-25 °C to +85 °C
2.5 mA (Typ)
Package
SSOP-A32
W (Typ) x D (Typ) x H (Max)
13.6 mm x 7.8 mm x 2.01 mm
Applications
Home Appliance such as IH Cooker, Refrigerator and
Rice Cooker
AV Appliance such as TV and HDD Recorder
Office Automation Appliance such as Printer
Electrical Equipment with Multiple Switches
Typical Application Circuit
VDD
4.7 μF
VDD
0.1 μF
1.0 μF
(Note 2)
1
VDD
VSS
AVDD
CS0
CS1
CS2
CS3
CS4
CS5
CS6
CS7
CS8
CS9
CS10
CS11
CS12
16
32
RSTB
DVDD
SCL
SDA
INTB
GPIO4
GPIO3
GPIO2
GPIO1
GPIO0
TEST
CS17
CS16
CS15
CS14
CS13
17
1.0 μF
(Note 1)
HOST
Sensor Electrode
(Note 1) The pull-up resistors for the SDA and SCL pins must be connected to VDD.
Choose the value of the pull-up resistors so as to meet 2-wire Serial Bus Interface Electrical Characteristics.
(Note 2) The resistors on sensor lines are for noise countermeasure, choose the value of the resistors by evaluation.
Product structure: Silicon integrated circuit
www.rohm.com
© 2019 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product has no designed protection against radioactive rays
1/43 TSZ02201-0D2D0F301110-1-2
18.Dec.2019 Rev.001



BU21181FS
BU21181FS
Contents
General Description ................................................................................................................................................................1
Features .................................................................................................................................................................................1
Applications ............................................................................................................................................................................1
Key Specifications...................................................................................................................................................................1
Package .................................................................................................................................................................................1
Typical Application Circuit........................................................................................................................................................1
Pin Configuration ....................................................................................................................................................................3
Pin Description........................................................................................................................................................................3
Block Diagram ........................................................................................................................................................................5
Description of Block ................................................................................................................................................................5
Absolute Maximum Ratings .....................................................................................................................................................7
Thermal Resistance ................................................................................................................................................................7
Recommended Operating Conditions ......................................................................................................................................8
Electrical Characteristics .........................................................................................................................................................8
Interface Specification.............................................................................................................................................................9
2-wire Serial Bus Interface Electrical Characteristics.............................................................................................................9
2-wire Serial Bus Protocol.................................................................................................................................................. 10
Power-on Sequence / Reset Timing....................................................................................................................................... 11
Power-on Flowchart........................................................................................................................................................... 11
Power-on Timing ............................................................................................................................................................... 11
Power-restart Timing.......................................................................................................................................................... 12
Reset Timing ..................................................................................................................................................................... 12
External Capacitor Specification ............................................................................................................................................ 12
Register Map ........................................................................................................................................................................ 13
Register Description.............................................................................................................................................................. 18
I/O Equivalence Circuit.......................................................................................................................................................... 39
Operational Notes ................................................................................................................................................................. 40
Ordering Information ............................................................................................................................................................. 41
Marking Diagram................................................................................................................................................................... 41
Physical Dimension and Packing Information ......................................................................................................................... 42
Revision History.................................................................................................................................................................... 43
www.rohm.com
© 2019 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
2/43
TSZ02201-0D2D0F301110-1-2
18.Dec.2019 Rev.001





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