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BS804B Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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BS804B Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 21 page  BS801B/02B/04B/06B/08B Rev. 1.00 6 July 7, 2009 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. 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. LHF Kout Type BS801B BS802B BS804B Open Level-Hold Low Toggle BS806B BS808B ¾ 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 o w e r O n R e s e t S t a n d b y M o d e K e y 0 O n ? N o r m a l M o d e A n y K e y A c t i v e I n 2 0 s e c . ? Y S t a n d b y M o d e A n y K e y O n ? N o r m a l M o d e A n y K e y A c t i v e I n 1 0 s e c . ? O K W i s O p e n ? O n e - K e y W a k e - u p A n y - K e y W a k e - u p Y N N N N Y Y Y N BS804B, BS806B and BS808B Operating Flow Y P o w e r O n R e s e t S t a n d b y M o d e A n y K e y O n ? N o r m a l M o d e A n y K e y A c t i v e I n 1 0 s e c . ? Y N N BS801B and BS802B Operating Flow |
Similar Part No. - BS804B |
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Similar Description - BS804B |
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