BS801C Datasheet, PDF (1/21 Pages) Holtek Semiconductor Inc – Touch Key

BS801C/02C/04C/06C/08C
Touch Key
Features
· Operating voltage: 2.2V~5.5V
· Ultra low current: 3.0mA at 3V
· Auto-calibration
· High reliability touch detections
· High PSRR
· Output type: Level-hold or Toggle
· One-key or Any-key State
· Key State Mode set by pins or serial command
· Open drain NMOS output
· Key status monitored using pins or serial bus
General Description
The BS801C/02C/04C/06C/08C are a range of 1 to 8
key touch key devices which can detect human body
contact using external touch pads. The high level of de-
vice integration enable applications to be implemented
with a minimum number of external components.
The BS804C and BS808C 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 operating current and a low
power one-key operating state, this range of touch key
devices provides a simple and effective means of imple-
menting touch switches in a wide variety of applications.
Selection Table
Part. No.
Touch
Keys
BS801C 1-Key
BS802C 2-Key
BS804C 4-Key
BS806C 6-Key
BS808C 8-Key
Operating Current at 3V
One-Key
State
Any-key
State
3.0mA
¾
¾
5.0mA
3.0mA
3.0mA
3.0mA
8.0mA
14.0mA
18.0mA
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
December 2, 2009