BS806C 데이터 시트보기 (PDF) - Holtek Semiconductor

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BS806C

(BS801C - BS808C) Touch Key

Holtek Semiconductor 

BS801C/02C/04C/06C/08C

Touch Key Outputs

All Kout pins have NMOS structures to allow easy inter-

facing to external devices with different operating volt-

ages. The BS801C, BS802 and BS804C devices can

have their outputs configured to operate with either

Level-Hold or Toggle type. The output type is deter-

mined by the status of the LHF pin which is read during

power-on. The logic level on this pin must not be

changed after power on. Internal circuitry ensures that

the internal pull-high resistor on the LHF pin will not

consume current. The BS806C and BS808C only have

Level-Hold output types.

Part No.

BS801C

BS802C

BS804C

BS806C

BS808C

LHF

Open

Low

¾

Kout Type

Level-Hold

Toggle

Level-Hold

Serial Interface - SCD

Both the BS804C and BS808C are equipped with a sin-

gle line serial interface on the SCD pin, allowing for easy

interfacing to an external MCU.

This single line interface allows communication in both

directions between the touch key device and the external

MCU. Using this interface, the external MCU can serially

read the status of the touch keys at any time. The Serial

interface also allows the external MCU to send com-

mands to the touch key device. The serial interface al-

lows three functions to be implemented, two are initiated

by the external MCU and one by the BS80xC.

SCD Command

Wake-up or Interrupt

MCU

Read Touch Key

Status

Send command to

BS804C/BS808C

Direction

BS804C/BS808C ® MCU

Step1: MCU send command

MCU ® BS804C/BS808C

Step2: MCU read key status

BS804C/BS808C ® MCU

MCU ® BS804C/BS808C

SCD Function Summary

· BS804C/BS808C Wakes-up or Interrupts MCU

When any of the touch keys change state, a pulse will

be generated by the BS804C/BS808C device which

can be used to wake up or to interrupt an external

MCU. The MCU must ensure that its pin connected to

the SCD pin is setup as an input to receive this pulse.

The pulse width generated by the device is equal to a

tSCD/2 period where tSCD is about 76ms.

tS C D /2

B S 804C

B S 808C

SCD

O /P

I/P

IN T

or

M CU

I/O

Wake-up/Interrupt Pulse to MCU

Rev. 1.00

O n e -K e y S ta te

Y

P ow erO n

O K W O pen ?

O K W lo w A n y - K e y S ta te

N

K ey0 O n ?

N

E n a b le K e y 0 O u tp u t

Y

A n y -K e y o n

N

w ith in 2 0 s e c . ?

Y

E n a b le K e y n O u tp u t

R e tu rn to

O n e -K e y S ta te

A n y -K e y

N

On ?

Y

E n a b le K e y n O u tp u t

BS804C, BS806C and BS808C Operating Flow

6

December 2, 2009

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