BS801B Datasheet, PDF (1/21 Pages) Holtek Semiconductor Inc – Touch Key

BS801B/02B/04B/06B/08B
Touch Key
Features
· Operating voltage: 2.2V~5.5V
· Ultra low standby current: 1.5mA at 3V
· Auto-calibration
· High reliability touch detections
· High PSRR
· Output type: Level-hold or Toggle
· One-key or Any-key Wake-up Mode
· Wake-up Mode set by pins or serial command
· Open drain NMOS output
· Key status monitored using pins or serial bus
General Description
The BS801B/02B/04B/06B/08B are a range of 1 to 8 key
touch key devices which can detect human body con-
tact using external touch pads. The high level of device
integration enable applications to be implemented with
a minimum number of external components.
The BS804B and BS808B are equipped with a One-line
serial interface to allow easy communication with an exter-
nal MCU for device setup and for touch pin monitoring pur-
poses.
Special internal circuitry is also employed to ensure
excellent power noise rejection to reduce the possibility
of false detections, increasing the touch switch applica-
tion reliability under adverse environmental conditions.
With auto-calibration, low standby current and a choice
of wake-up features, this range of touch key devices
provides a simple and effective means of implementing
touch switches in a wide variety of applications.
Selection Table
Part. No.
Touch
Keys
BS801B 1-Key
BS802B 2-Key
BS804B 4-Key
BS806B 6-Key
BS808B 8-Key
Standby Current at 3V
One-Key
Wake-up
Any-key
Wake-up
1.5mA
¾
¾
2.0mA
1.5mA
1.5mA
1.5mA
3.0mA
4.0mA
5.0mA
Key
Output
Type
Package
Level-Hold
or Toggle
Level-Hold
or Toggle
¾
Level-Hold
or Toggle
Level-Hold
SOT23-6
8SOP
8SOP
16NSOP
16NSOP
¾
16NSOP
Level-Hold 20SOP/SSOP
Serial
Interface
¾
¾
Ö
¾
Ö
¾
Auto
Calibration
Ö
Rev. 1.00
1
July 7, 2009