BS801C Holtek Semiconductor Inc., BS801C Datasheet - Page 2

• Manufacturer Part Number: BS801C
• Description: Touch Key
• Manufacturer: Holtek Semiconductor Inc.

Pin Assignment
Pin Description
The pins in the following table are common to all devices.
The following table shows device specific pins.
Note:
Rev. 1.00
Key0~Keyn
Kout0~Koutn Output Touch key n output pin.
Cref
VSS
VDD
OKW
SCD
LHF
Pin Name
Pin Name
It is important that the logic level of the OKW and LHF pins do not change state after power-on.
Output
Input/
Input
Input
Input
Input
I/O
I/O
Touch key n input. These pins are connected to the external touch key.
Touch key reference capacitor input - value range of 0pF to 10pF - higher capacitance val-
ues result in higher sensitivities.
Negative power supply, ground
Positive power supply
BS804C
BS806C
BS808C
BS804C
BS808C
BS801C
BS802C
BS804C
Device
Selects One-key State or Any-key State.
Pin condition is read during power-up. The logic status of this pin must not be
changed after power-on. After power-on this pin s function can be overridden
by a serial command on relevant devices. Pin connected to an internal
pull-high resistor. Internal circuitry ensures that this pull high resistor will not
consume current even if the input is low.
Open: One-key State using key0 only
Low: Any-Key State
Serial bus pin used to communicate with an external MCU. The external MCU
can read the BS804C or BS808C touch key status and also send commands
to the device via this pin.
Selects Key Output Type
Pin condition is read during power-up. The logic status of this pin must not be
changed after power-on. After power-on this pin s function can be overridden
by a serial command on relevant devices. Pin connected to an internal
pull-high resistor. Internal circuitry ensures that this pull high resistor will not
consume current even if the input is low.
Open: Level-Hold output
Low: Toggle output
2
Description
Description
BS801C/02C/04C/06C/08C
December 2, 2009