BS802B Просмотр технического описания (PDF) - Holtek Semiconductor

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BS802B

(BS801C Thru BS808C) Touch Key

Holtek Semiconductor 

BS801B/02B/04B/06B/08B

When in the Standby Mode, after a relevant Keyn

wake-up detection has been made, the device will

switch to the Normal Mode and await subsequent switch

detections on all their Keyn pins. It will remain in the Nor-

mal Mode for about 10 seconds for the BS801B and

BS802B devices and for about 20 seconds for the other

devices and if no further detections are made during this

time will return to the Standby Mode.

P ow er O n R eset

S ta n d b y M o d e

N

A ny K ey O n ?

Y

N o rm a l M o d e

A n y K e y A c tiv e

N

In 1 0 s e c . ?

Y

BS801B and BS802B Operating Flow

Touch Key Outputs

All Kout pins have NMOS structures to allow easy inter-

facing to external devices with different operating volt-

ages. The BS801B, BS802 and BS804B 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 BS806B and BS808B only have

Level-Hold output types.

Part No.

BS801B

BS802B

BS804B

BS806B

BS808B

LHF

Open

Low

¾

Kout Type

Level-Hold

Toggle

Level-Hold

Serial Interface - SCD

Both the BS804B and BS808B 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-

P ow er O n R eset

Y

O K W is O p e n ?

N

Rev. 1.00

S ta n d b y M o d e

K ey0 O n ?

N

Y

N o rm a l M o d e

S ta n d b y M o d e

A ny K ey O n ?

N

Y

N o rm a l M o d e

A n y K e y A c tiv e

N

In 2 0 s e c . ?

A n y K e y A c tiv e

N

In 1 0 s e c . ?

Y

Y

O n e -K e y W a k e -u p

A n y -K e y W a k e -u p

BS804B, BS806B and BS808B Operating Flow

6

July 7, 2009

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