Document
BS812A-1/BS813A-1/BS814A-1/BS814A-2 BS816A-1/BS818A-2/BS8112A-3/BS8116A-3
Touch Key
Features
• Operating voltage: 2.2V~5.5V • Low standby current • Auto-calibration • Reliable touch detections • Standby and normal operating modes • Maximum key on duration time detection • Adaptive voltage drop function • Level Hold, selectable active level- low or high • NMOS output with internal pull-high/CMOS-
Direct Output • Both serial interface and parallel outputs • Sensitivity adjustment using an external capacitor • Minimal number of external components
General Description
The BS81x is a series of 2~16 key touch key devices which can detect human body contact using external touch pads. The high level of device integration enable applications to be implemented with a minimum number of external components.
The BS81x series devices are equipped with serial or parallel interfaces to allow easy communication with an external MCU for device setup and for touch pin monitoring purposes. Special internal circuitry is also employed to ensure excellent power noise rejection to reduce the possibility of false detections, increasing the touch switch application reliability under adverse environmental conditions.
With auto-calibration, low standby current, excellent resistance to voltage fluctuation and other features, this range of touch key devices provide a simple and effective means of implementing touch key operation in a wide variety of applications.
Selection Table
For this device series, most of the feature are similar. The BS8112A-3 and BS8116A-3 provide I2C function. The BS814A-2 and BS818A-2 include a serial interface function while the BS812A-1, BS813A-1, BS814A-1 and BS816A-1 have parallel outputs. Meanwhile the BS8112A-3 and BS8116A-3 can set up some options and the sensitivity through the I2C communication interface and the BS816A-1 and BS818A-2 include two hardware options. The following table summarizes the main characteristics of each device.
Part. No. BS812A-1 BS813A-1 BS814A-1 BS814A-2
BS816A-1
BS818A-2 BS8112A-3 BS8116A-3
Touch Key 2-Key
3-Key
4-Key
4-Key
Option
× × × ×
6-Key OMS/LSC(Note 1)
8-Key OMS/LSC(Note 1)
12-Key
Note 2
16-Key
Note 2
Istb@3V 2.0μA 4.5μA 5.0μA 5.0μA
12μA/6μA
12μA/6μA 13μA/3μA 17μA/3.5μA
Parallel Outputs
Serial Interface
Power Mode
Auto Calibration
Package
NMOS (internal pull-high)
× × ×
√ SOT23-6 √ 8SOP √ 10MSOP
×√
√ 8SOP
NMOS (internal pull-high)/
CMOS-Direct
×
Normal and Standby
√ 16NSOP
Binary
√
√ 16NSOP
× I2C
√ 16NSOP
× I2C
√ 20SOP/SSOP
Note: 1. Refer to the OMS/LSC Option table. 2. Refer to the I2C Option table.
Rev. 1.50
1 July 13, 2018
Pin Assignment
BS812A-1/BS813A-1/BS814A-1/BS814A-2 BS816A-1/BS818A-2/BS8112A-3/BS8116A-3
Kout2 Key2 Key1
SOT23-6
6
54
12A-1 Top View
1 23
Kout1 VSS VDD
VDD Key1 Key2 Key3 Key4
1 10 29 38 47 56
BS814A-1 10MSOP-A
VSS Kout1 Kout2 Kout3 Kout4
Key1 Key2 Key3 Key4 Key5 Key6 OMS LSC
1 16 2 15 3 14 4 13 5 12 6 11 7 10 89
BS816A-1 16 .