BS801B

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/c183Operating voltage: 2.2V~5.5V /c183Ultra low standby current: 1.5/c109Aa t3 V /c183Auto-calibration /c183High reliability touch detections /c183High PSRR /c183Output type: Level-hold or Toggle /c183One-key or Any-key Wake-up Mode /c183Wake-up Mode set by pins or serial command /c183Open drain NMOS output /c183Key status monitored using pins or serial bus General Description The BS801B/02B/04B/06B/08B are a range of 1 to 8 key touch key devices which can detect human body con - tact using external touch pads. The high level of device integration enable applications to be implemented with a minimum number of external components. The BS804B and BS808B are equipped with a One-line serial interface to allow easy communication with an exter- nal MCU for device setup and for touch pin monitoring pur- poses. Special internal circuitry is also employed to ensure excellent power noise rejection to reduce the possibility of false detections, increasing the touch switch applica- tion reliability under adverse environmental conditions. With auto-calibration, low standby current and a choice of wake-up features, this range of touch key devices provides a simple and effective means of implementing touch switches in a wide variety of applications.

The pins in the following table are common to all devices. Pin Name I/O Description Key0~Keyn Input Touch key n input. These pins are connected to the external touch key. Kout0~Koutn Output Touch key n output pin. Cref Input Touch key reference capacitor input - value range of 0pF to 10pF - higher capacitance val- ues result in higher sensitivities. VSS /c190Negative power supply, ground VDD /c190Positive power supply The following table shows device specific pins. Pin Name I/O Device Description OKW Input BS804B BS806B BS808B Selects One-key wake-up or Any-key wake-up. 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/c162s 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 wake-up using key0 only Low: Any-Key wake-up SCD Input/ Output BS804B BS808B Serial bus pin used to communicate with an external MCU. The external MCU can read the BS804B or BS808B touch key status and also send commands to the device via this pin. LHF Input BS801B BS802B BS804B 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/c162s 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 Note: It is important that the logic level of the OKW and LHF pins do not change state after power-on. BS801B/02B/04B/06B/08B Rev. 1.00 2 July 7, 2009 /G31 /G32 /G33 /G34 /G38 /G37 /G36 /G35 /G4B /G65 /G79 /G30 /G4B /G6F /G75 /G74 /G31 /G4B /G6F /G75 /G74 /G30 /G56 /G53 /G53 /G43 /G72 /G65 /G66 /G4B /G65 /G79 /G31 /G56 /G44 /G44 /G4C /G48 /G46 /G42 /G53 /G38 /G30 /G32 /G42 /G38 /G20 /G53 /G4F /G50 /G2D /G41 /G31 /G32 /G33 /G34 /G38 /G37 /G36 /G35 /G4B /G65 /G79 /G31 /G4B /G65 /G79 /G32 /G4B /G65 /G79 /G33 /G43 /G72 /G65 /G66 /G4B /G65 /G79 /G30 /G53 /G43 /G44 /G56 /G44 /G44 /G56 /G53 /G53 /G42 /G53 /G38 /G30 /G34 /G42 /G38 /G20 /G53 /G4F /G50 /G2D /G41 /G42 /G53 /G38 /G30 /G34 /G42 /G31 /G36 /G20 /G4E /G53 /G4F /G50 /G2D /G41 /G31 /G36 /G31 /G35 /G31 /G34 /G31 /G33 /G31 /G32 /G31 /G31 /G31 /G30 /G39 /G31 /G32 /G33 /G34 /G35 /G36 /G37 /G38 /G4B /G65 /G79 /G30 /G4B /G65 /G79 /G31 /G4B /G65 /G79 /G32 /G4B /G65 /G79 /G33 /G43 /G72 /G65 /G66 /G56 /G53 /G53 /G4E /G43 /G4E /G43 /G4B /G6F /G75 /G74 /G30 /G4B /G6F /G75 /G74 /G31 /G4B /G6F /G75 /G74 /G32 /G4B /G6F /G75 /G74 /G33 /G53 /G43 /G44 /G56 /G44 /G44 /G4F /G4B /G57 /G4C /G48 /G46 /G31 /G36 /G31 /G35 /G31 /G34 /G31 /G33 /G31 /G32 /G31 /G31 /G31 /G30 /G39 /G31 /G32 /G33 /G34 /G35 /G36 /G37 /G38 /G42 /G53 /G38 /G30 /G36 /G42 /G31 /G36 /G20 /G4E /G53 /G4F /G50 /G2D /G41 /G4B /G65 /G79 /G30 /G4B /G65 /G79 /G31 /G4B /G65 /G79 /G32 /G4B /G65 /G79 /G33 /G4B /G65 /G79 /G34 /G4B /G65 /G79 /G35 /G43 /G72 /G65 /G66 /G56 /G53 /G53 /G4B /G6F /G75 /G74 /G30 /G4B /G6F /G75 /G74 /G31 /G4B /G6F /G75 /G74 /G32 /G4B /G6F /G75 /G74 /G33 /G4B /G6F /G75 /G74 /G34 /G4B /G6F /G75 /G74 /G35 /G56 /G44 /G44 /G4F /G4B /G57 /G32 /G30 /G31 /G39 /G31 /G38 /G31 /G37 /G31 /G36 /G31 /G35 /G31 /G34 /G31 /G33 /G31 /G32 /G31 /G31 /G31 /G32 /G33 /G34 /G35 /G36 /G37 /G38 /G39 /G31 /G30 /G42 /G53 /G38 /G30 /G38 /G42 /G32 /G30 /G20 /G53 /G4F /G50 /G2D /G41 /G2F /G53 /G53 /G4F /G50 /G2D /G41 /G4B /G65 /G79 /G30 /G4B /G65 /G79 /G31 /G4B /G65 /G79 /G32 /G4B /G65 /G79 /G33 /G4B /G65 /G79 /G34 /G4B /G65 /G79 /G35 /G4B /G65 /G79 /G36 /G4B /G65 /G79 /G37 /G43 /G72 /G65 /G66 /G56 /G53 /G53 /G4B /G6F /G75 /G74 /G30 /G4B /G6F /G75 /G74 /G31 /G4B /G6F /G75 /G74 /G32 /G4B /G6F /G75 /G74 /G33 /G4B /G6F /G75 /G74 /G34 /G4B /G6F /G75 /G74 /G35 /G4B /G6F /G75 /G74 /G36 /G4B /G6F /G75 /G74 /G37 /G56 /G44 /G44 /G4F /G4B /G57 /G31 /G36 /G31 /G35 /G31 /G34 /G31 /G33 /G31 /G32 /G31 /G31 /G31 /G30 /G39 /G31 /G32 /G33 /G34 /G35 /G36 /G37 /G38 /G42 /G53 /G38 /G30 /G38 /G42 /G31 /G36 /G20 /G4E /G53 /G4F /G50 /G2D /G41 /G4B /G65 /G79 /G30 /G4B /G65 /G79 /G31 /G4B /G65 /G79 /G34 /G4B /G65 /G79 /G35 /G4B /G65 /G79 /G36 /G4B /G65 /G79 /G37 /G43 /G72 /G65 /G66 /G4E /G43 /G4B /G65 /G79 /G32 /G4B /G65 /G79 /G33 /G4E /G43 /G4E /G43 /G4E /G43 /G53 /G43 /G44 /G56 /G44 /G44 /G56 /G53 /G53 /G4B /G6F /G75 /G74 /G56 /G53 /G53 /G54 /G6F /G70 /G20 /G56 /G69 /G65 /G77 /G4C /G48 /G46 /G43 /G72 /G65 /G66 /G4B /G65 /G79 /G31 /G32 /G33 /G34 /G36 /G35 /G56 /G44 /G44 /G42 /G53 /G38 /G30 /G31 /G42 /G53 /G4F /G54 /G32 /G33 /G2D /G36 /G2D /G41

Note: These are stress ratings only. Stresses exceeding the range specified under/c178Absolute Maximum Ratings/c178may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. D.C. Characteristics BS801B Ta=25/c176C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions VDD Operating Voltage /c190/c190 2.2 /c190 5.5 V ISTB Standby Current 3V No load /c190 1.5 2.5 /c109A IDD Operating Current 3V No load /c190 36 /c109A VIH Input High Voltage /c190/c190 0.7VDD /c190 VDD V VIL Input Low Voltage /c190/c190 0 /c190 0.3VDD V IOL Sink Current 3V VOL=0.1VDD 48 /c190 mA RPH Pull-high Resistance 3V /c190 20 60 100 k/c87 BS802B Ta=25/c176C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions VDD Operating Voltage /c190/c190 2.2 /c190 5.5 V ISTB Standby Current, Any Key Wake-up 3V No load /c190 23 /c109A IDD Operating Current 3V No load /c190 51 0 /c109A VIH Input High Voltage /c190/c190 0.7VDD /c190 VDD V VIL Input Low Voltage /c190/c190 0 /c190 0.3VDD V IOL Sink Current 3V VOL=0.1VDD 48 /c190 mA RPH Pull-high Resistance 3V /c190 20 60 100 k/c87 BS801B/02B/04B/06B/08B Rev. 1.00 3 July 7, 2009

BS804B Ta=25/c176C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions VDD Operating Voltage /c190/c190 2.2 /c190 5.5 V ISTB1 Standby Current - One-key Wake-up 3V No load /c190 1.5 2.5 /c109A ISTB2 Standby Current - Any-Key Wake-up 3V No load 3 5 /c109A I DD Operating Current 3V No load /c190 81 6 /c109A VIH Input High Voltage /c190/c190 0.7VDD /c190 VDD V VIL Input Low Voltage /c190/c190 0 /c190 0.3VDD V IOL Sink Current 3V VOL=0.1VDD 48 /c190 mA RPH Pull-high Resistance 3V /c190 20 60 100 k/c87 BS806B Ta=25/c176C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions VDD Operating Voltage /c190/c190 2.2 /c190 5.5 V ISTB1 Standby Current - One-key Wake-up 3V No load /c190 1.5 2.5 /c109A I STB2 Standby Current - Any-Key Wake-up 3V No load 4.0 6.5 /c109A I DD Operating Current 3V No load /c190 14 28 /c109A VIH Input High Voltage /c190/c190 0.7VDD /c190 VDD V VIL Input Low Voltage /c190/c190 0 /c190 0.3VDD V IOL Sink Current 3V VOL=0.1VDD 48 /c190 mA RPH Pull-high Resistance 3V /c190 20 60 100 k/c87 BS808B Ta=25/c176C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions VDD Operating Voltage /c190/c190 2.2 /c190 5.5 V ISTB1 Standby Current - One-key Wake-up 3V No load /c190 1.5 2.5 /c109A I STB2 Standby Current - Any-Key Wake-up 3V No load 5 8 /c109A I DD Operating Current 3V No load /c190 18 36 /c109A VIH Input High Voltage /c190/c190 0.7VDD /c190 VDD V VIL Input Low Voltage /c190/c190 0 /c190 0.3VDD V IOL Sink Current 3V VOL=0.1VDD 48 /c190 mA RPH Pull-high Resistance 3V /c190 20 60 100 k/c87 BS801B/02B/04B/06B/08B Rev. 1.00 4 July 7, 2009

A.C. Characteristics Ta=25/c176C Symbol Parameter Test Conditions Min. Typ. Max. Unit VDD Conditions fSCD SCD Clock 3V /c190 10.4 13.0 15.6 kHz fKRT1 Key Response Time in Normal Mode 3V /c190 75 100 125 ms tKRT2 Key Response Time in Standby Mode 3V /c190 300 400 500 ms tKH Maximum Key Hold Time 3V /c190 30 40 50 s tCAL1 Auto-Calibration Period - Normal Mode 3V /c190 1.8 2.5 3.2 s tCAL2 Auto-Calibration Period - Standby Mode 3V /c190 7.5 10.0 12.5 s BS801B/02B/04B/06B/08B Rev. 1.00 5 July 7, 2009 Functional Description Introduction This range of BS80xB touch key devices offer an easy and reliable means of implementing touch switch func - tions in a range of applications. A single external capaci- tor is the only external component required for most applications while a single line serial bus offers conve - nient communication with an external MCU. Device Operation Modes All devices have two modes of operation, the Standby Mode and the Normal Mode. After the device is powered up it will automatically enter the Standby Mode to con- serve power. The BS801B and BS802B devices can then be woken up by touching any of their Keyn pins. The BS804B, BS806B and BS808B devices can how- ever be woken up by either a One-key Wake-up using Key0, or by Any-key Wake-up. The wake-up method is determined by the status of the OKW pin which is read only during power-on. The advantage of choosing the One-key wake-up option is that it consumes less power than the Any-key wake-up when in the Standby Mode. Part No. OKW Open OKW Low BS804B BS806B BS808B One-key Wake-up Any-key Wake-up The logic status of the OKW pin is read when the device powers up. The logic level on this pin must not be changed after power on. Internal circuitry ensures that the internal pull-high resistor on the OKW pin will not consume current. Part No. Normal Mode On Time BS801B BS802B Approx10 sec BS804B BS806B BS808B Approx 20 secs /G4B /G65 /G79 /G20 /G53 /G74 /G61 /G74 /G65 /G4F /G70 /G65 /G72 /G61 /G74 /G69 /G6E /G67 /G20 /G53 /G74 /G61 /G74 /G65 /G4B /G6F /G75 /G74 /G50 /G4F /G52 /G53 /G74 /G61 /G6E /G64 /G62 /G79 /G53 /G74 /G61 /G6E /G64 /G62 /G79 /G4E /G6F /G72 /G6D /G61 /G6C /G41 /G63 /G74 /G69 /G76 /G65 /G20 /G4C /G6F /G77 /G41 /G63 /G74 /G69 /G76 /G65 /G20 /G4C /G6F /G77 /G4B /G65 /G79 /G20 /G4F /G6E /G4B /G65 /G79 /G20 /G4F /G6E /G31 /G30 /G2F /G32 /G30 /G73 Operating Mode

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 /c190 Level-Hold Serial Interface /c45SCD 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- /G50 /G6F /G77 /G65 /G72 /G20 /G4F /G6E /G20 /G52 /G65 /G73 /G65 /G74 /G53 /G74 /G61 /G6E /G64 /G62 /G79 /G20 /G4D /G6F /G64 /G65 /G4B /G65 /G79 /G30 /G20 /G4F /G6E /G20 /G3F /G4E /G6F /G72 /G6D /G61 /G6C /G20 /G4D /G6F /G64 /G65 /G41 /G6E /G79 /G20 /G4B /G65 /G79 /G20 /G41 /G63 /G74 /G69 /G76 /G65 /G49 /G6E /G20 /G32 /G30 /G20 /G73 /G65 /G63 /G2E /G20 /G3F /G59 /G53 /G74 /G61 /G6E /G64 /G62 /G79 /G20 /G4D /G6F /G64 /G65 /G41 /G6E /G79 /G20 /G4B /G65 /G79 /G20 /G4F /G6E /G20 /G3F /G4E /G6F /G72 /G6D /G61 /G6C /G20 /G4D /G6F /G64 /G65 /G41 /G6E /G79 /G20 /G4B /G65 /G79 /G20 /G41 /G63 /G74 /G69 /G76 /G65 /G49 /G6E /G20 /G31 /G30 /G20 /G73 /G65 /G63 /G2E /G20 /G3F /G4F /G4B /G57 /G20 /G69 /G73 /G20 /G4F /G70 /G65 /G6E /G20 /G3F /G4F /G6E /G65 /G2D /G4B /G65 /G79 /G20 /G57 /G61 /G6B /G65 /G2D /G75 /G70 /G41 /G6E /G79 /G2D /G4B /G65 /G79 /G20 /G57 /G61 /G6B /G65 /G2D /G75 /G70 /G59 /G4E /G4E /G4E /G4E /G59 /G59 /G59 /G4E BS804B, BS806B and BS808B Operating Flow /G59 /G50 /G6F /G77 /G65 /G72 /G20 /G4F /G6E /G20 /G52 /G65 /G73 /G65 /G74 /G53 /G74 /G61 /G6E /G64 /G62 /G79 /G20 /G4D /G6F /G64 /G65 /G41 /G6E /G79 /G20 /G4B /G65 /G79 /G20 /G4F /G6E /G20 /G3F /G4E /G6F /G72 /G6D /G61 /G6C /G20 /G4D /G6F /G64 /G65 /G41 /G6E /G79 /G20 /G4B /G65 /G79 /G20 /G41 /G63 /G74 /G69 /G76 /G65 /G49 /G6E /G20 /G31 /G30 /G20 /G73 /G65 /G63 /G2E /G20 /G3F /G59 /G4E /G4E BS801B and BS802B Operating Flow

Rev. 1.00 7 July 7, 2009 lows three functions to be implemented, two are initiated by the external MCU and one by the BS80xB. SCD Command Direction Wake-up or Interrupt MCU BS804B/BS808B /c174MCU Read Touch Key Status Step1: MCU send command MCU /c174BS804B/BS808B Step2: MCU read key status BS804B/BS808B /c174MCU Send command to BS804B/BS808B MCU /c174BS804B/BS808B SCD Function Summary /c183BS804B/BS808B Wakes-up or Interrupts MCU When any of the touch keys change state, a pulse will be generated by the BS804B/BS808B 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 t SCD/2 period where tSCD is about 76/c109s. /c183MCU reads the touch key status The MCU can send a command to the BS804B/ BS808B device to request the touch key status. The protocol for reading the touch key status is as follows: /c168The external MCU takes control of the SCD line and first sends three rising edge pulses or more to the BS804B/BS808B within a time of about 152/c109s. /c168The MCU then changes its I/O pin to an input. /c168The BS804B/BS808B device will then pull the SCD line low, then high, the timings are given by syn - chronise period. This allows the MCU to synchro - nise itself for the data transfer. /c168The BS804B/BS808B device will then transmit its key status, given by D0~Dn /c45For the BS804B, the data format is D0~D3. /c45For the BS808B, the data format is D0~D7. /c168The MCU can then read the key status taking care to read the data in the centre of the transmitted data pulse. /c168After the last data bit is transferred the BS804B/BS808B device will return its SCD pin to an input state. The timings associated with the above protocol can be described in multiples of the SCD clock periods. The SCD clock period is about about 76/c109s. A certain time is required for the MCU to transmit three or more pulses to inform the device that it desires to read the key status. After this time has elapsed the de- vice will then transmit the data bits, D0~Dn. Device Time BS804B 22 tSCD BS808B 38 tSCD Key Status Read Total Time Each bit of transmitted data corresponds directly to a touch input key. Therefore the status of touch key Key0 is represented by D0, Key1 by D1 and so on. A/c178low/c178bit means that a touch has been detected, a /c178high/c178bit means no touch has been detected. Pin Data Bit Dn Value Key0 D0 1: Key Off 0: Key On Key1 D1 Keyn Dn /c183MCU sends commands to BS804B/BS808B device The MCU can send commands along the SCD line to setup the device in different Operating Modes. To do this the externally connected MCU takes control of the SCD line, first forcing it low and holding it low for a time of greater than 8 t SCD cycles. This action will tem- porarily disable the device and enable it to receive the command from the MCU. Any command sent to the device from the MCU will override the original power on configuration setup. The desired Operating Mode to be setup depends upon the number of pulses received by BS804B/ BS808B within a time period, 4 t SCD, as shown in the table. After the programming clock cycles have been transmitted and the SCD line returns high, the device will return to normal operation. Clock Pulses Operating Mode 0~2 Set by external pin 3~6 One-key wake-up 7~10 For test purposes 11~14 Any-Key wake-up >15 Always normal operation BS804B and BS808B SCD Commands /G74 /G53 /G43 /G44 /G2F /G32 /G4D /G43 /G55 /G49 /G4E /G54 /G6F /G72 /G49 /G2F /G4F /G53 /G43 /G44 /G42 /G53 /G38 /G30 /G34 /G42 /G42 /G53 /G38 /G30 /G38 /G42 /G49 /G2F /G50 /G4F /G2F /G50 Wake-up/Interrupt Pulse to MCU /G53 /G43 /G44 /G20 /G4C /G69 /G6E /G65 /G66 /G72 /G6F /G6D /G20 /G4D /G43 /G55 /G4E /G75 /G6D /G62 /G65 /G72 /G20 /G6F /G66 /G20 /G70 /G75 /G6C /G73 /G65 /G73 /G77 /G69 /G74 /G68 /G69 /G6E /G20 /G34 /G20 /G74 /G53 /G43 /G44 /G73 /G65 /G74 /G73 /G20 /G6F /G70 /G65 /G72 /G61 /G74 /G69 /G6E /G67 /G20 /G6D /G6F /G64 /G65 /G31 /G32 /G6E /G54 /G41 /G34 /G20 /G74 /G53 /G43 /G44 /G4E /G6F /G74 /G65 /G3A /G20 /G54 /G41 /G20 /G3E /G20 /G38 /G20 /G74 /G53 /G43 /G44 /G20 /G50 /G65 /G72 /G69 /G6F /G64 /G73 SCD Device Setup

Rev. 1.00 8 July 7, 2009 Note that the MCU must transmits these pulses within 4 tSCD. Maximum Key On Duration Time To minimise the possibility of unintentional switch detec- tions, such as undesired objects covering the sense electrodes, the devices includes a Maximum Key-On duration time function. To implement this function the devices include an internal timer, which starts running after each switch detection. If the key on time of a touch key exceeds a value of about 40 seconds, then the de- vice will be reset to its power-on condition and initiate a new auto calibration. The output will then remain inac- tive until the next switch detection. Auto-calibration Function The devices include a full auto-calibration function which will be initiated after the device is powered-on. In addition to the power-on calibration, if no switch detec - tion has been made for more than about 2.5 seconds then a further calibration procedure will be carried out. The calibration is applied independently to each chan - nel on the devices. By implementing this feature, changes in the touch key environmental conditions are automatically catered for dynamically. Sensitivity Adjustment The sensitivity of the switch is a very important consider- ation in most applications whose requirements will vary according to the user application. The user should therefore be aware of the factors which will affect the overall sensitivity of their touch key application. Factors to take into consideration include the electrode size and the capacitance of the connection lines from the elec - trode to the BS80xB device. Therefore the sensitivity will vary according to the actual PCB layout and design. An external capacitor, Cs, connected to the Cref pin, is used to set the overall sensitivity of all pins. Some of the most important factors affecting sensitivity are the fol - lowing: /c183Cref capacitor value - Cs The purpose of the Cs capacitor is to allow for adjust- ment of touch key sensitivity and power noise rejec - tion. The optimal choice of sensitivity and power noise rejection will be obtained when the value of the Cs ca- pacitor is equivalent to the touch pad capacitance, however the value can still be changed to obtain the required sensitivity value. Higher Cs values will result in higher levels of sensitivity. Recommended values for Cs are between 0pF and 10pF. /c183Touch key pad size Larger touch key sizes will increase sensitivity and of course vice-versa, small electrode sizes will decrease sensitivity. /c183Touch key pad insulating panel thickness A thinner panel will result in higher sensitivity and of course thicker panels will result in a lower sensitivities. /c183Touch key pad insulating panel material The choice of the dielectric material for the panel will in- fluence the sensitivity. Materials with higher dielectric constants will result in higher sensitivities and lower di- electric constants will result in lower sensitivities. /G44 /G65 /G76 /G69 /G63 /G65 /G42 /G53 /G38 /G30 /G34 /G42 /G42 /G53 /G38 /G30 /G38 /G42 /G54 /G6F /G75 /G63 /G68 /G20 /G53 /G77 /G69 /G74 /G63 /G68 /G20 /G44 /G61 /G74 /G61 /G20 /G4C /G65 /G6E /G67 /G74 /G68 /G34 /G20 /G62 /G69 /G74 /G73 /G38 /G20 /G62 /G69 /G74 /G73 /G44 /G30 /G7E /G44 /G33 /G44 /G30 /G7E /G44 /G37 /G44 /G61 /G74 /G61 /G20 /G46 /G6F /G72 /G6D /G61 /G74 /G4C /G65 /G61 /G64 /G20 /G43 /G6C /G6F /G63 /G6B /G32 /G74 /G53 /G43 /G44 /G74 /G53 /G43 /G44 /G4D /G43 /G55 /G20 /G61 /G73 /G20 /G4F /G75 /G74 /G70 /G75 /G74 /G2C /G64 /G65 /G76 /G69 /G63 /G65 /G20 /G61 /G73 /G20 /G49 /G6E /G70 /G75 /G74 /G4D /G43 /G55 /G20 /G61 /G73 /G20 /G49 /G6E /G70 /G75 /G74 /G2C /G20 /G64 /G65 /G76 /G69 /G63 /G65 /G20 /G61 /G73 /G20 /G4F /G75 /G74 /G70 /G75 /G74 /G53 /G79 /G6E /G63 /G20 /G50 /G65 /G72 /G69 /G6F /G64 /G53 /G79 /G6E /G63 /G68 /G72 /G6F /G6E /G69 /G73 /G65 /G32 /G74 /G53 /G43 /G44 /G32 /G74 /G53 /G43 /G44 /G32 /G74 /G53 /G43 /G44 /G74 /G53 /G43 /G44 /G74 /G53 /G43 /G44 /G74 /G53 /G43 /G44 /G32 /G74 /G53 /G43 /G44 /G74 /G53 /G43 /G44 /G4B /G65 /G79 /G20 /G53 /G74 /G61 /G74 /G75 /G73 /G4D /G43 /G55 /G20 /G61 /G73 /G20 /G49 /G6E /G70 /G75 /G74 /G2C /G64 /G65 /G76 /G69 /G63 /G65 /G20 /G61 /G73 /G20 /G49 /G6E /G70 /G75 /G74 /G44 /G30 /G44 /G31 /G44 /G6E /G53 /G43 /G44 SCD Pin Touch Key Status Request Key Cref Touch Key 0pF~ 10pF Cs

Note: If the output is connected to an MCU input with an internal pull high resistor then the pull high resistor on the ap- plication circuit is not required. BS801B/02B/04B/06B/08B Rev. 1.00 9 July 7, 2009 Key0 Cref VSS Touch Key0 0pF~ 10pF VDD LHF Kout0 VDD 0.1uF R BS802B Key1 Touch Key1 Kout1 VDD VDD R Cs Key Cref VSS Touch Key 0pF~ 10pF VDD LHF Kout VDD 0.1uF BS801B VDD R Cs Key0 Cref VSS Touch Key0 0pF~ 10pF VDD LHF Kout0 VDD 0.1uF BS804B Key3 Touch Key3 Kout3 SCD INTB or Port MCU OKW VDD VDD R R Cs

Note: If the output is connected to an MCU input with an internal pull high resistor then the pull high resistor on the ap- plication circuit is not required. BS801B/02B/04B/06B/08B Rev. 1.00 10 July 7, 2009 Key0 Cref VSS Touch Key0 0pF~ 10pF VDD Kout0 VDD 0.1uF BS806B Key5 Touch Key5 Kout5 VDD R VDD R OKW Cs Key0 Cref VSS Touch Key0 0pF~ 10pF VDD OKW Kout0 VDD 0.1uF BS808B Key7 Touch Key7 Kout7 SCD INTB or Port MCU VDD R VDD R Cs

Package Information

8-pin SOP (150mil) Outline Dimensions /c183MS-012 Symbol Dimensions in mil Min. Nom. Max. A 228 /c190 244 B 150 /c190 157 C1 2 /c190 20 C/c162 188 /c190 197 D /c190/c190 69 E /c190 50 /c190 F4 /c190 10 G1 6 /c190 50 H7 /c190 10 /c97 0/c176/c1908/c176 BS801B/02B/04B/06B/08B Rev. 1.00 11 July 7, 2009 /G44 /G46 /G43 /G27 /G47 /G48 /G61 /G45 /G38 /G31 /G41 /G42 /G43 /G34 /G35

16-pin NSOP (150mil) Outline Dimensions /c183MS-012 Symbol Dimensions in mil Min. Nom. Max. A 228 /c190 244 B 150 /c190 157 C1 2 /c190 20 C/c162 386 /c190 394 D /c190/c190 69 E /c190 50 /c190 F4 /c190 10 G1 6 /c190 50 H7 /c190 10 /c97 0/c176/c1908/c176 BS801B/02B/04B/06B/08B Rev. 1.00 12 July 7, 2009 /G31 /G36 /G31 /G39 /G38 /G61 /G41 /G42 /G43 /G44 /G45 /G46 /G47 /G48 /G43 /G27

20-pin SOP (300mil) Outline Dimensions /c183MS-013 Symbol Dimensions in mil Min. Nom. Max. A 393 /c190 419 B 256 /c190 300 C1 2 /c190 20 C/c162 496 /c190 512 D /c190/c190 104 E /c190 50 /c190 F4 /c190 12 G1 6 /c190 50 H8 /c190 13 /c97 0/c176/c1908/c176 BS801B/02B/04B/06B/08B Rev. 1.00 13 July 7, 2009 /G32 /G30 /G31 /G31 /G31 /G31 /G30 /G41 /G42 /G43 /G44 /G45 /G46 /G43 /G27 /G47 /G48 /G61

20-pin SSOP (150mil) Outline Dimensions Symbol Dimensions in mil Min. Nom. Max. A 228 /c190 244 B 150 /c190 158 C8 /c190 12 C/c162 335 /c190 347 D4 9 /c190 65 E /c190 25 /c190 F4 /c190 10 G1 5 /c190 50 H7 /c190 10 /c97 0/c176/c1908/c176 BS801B/02B/04B/06B/08B Rev. 1.00 14 July 7, 2009 /G32 /G30 /G31 /G31 /G31 /G31 /G30 /G41 /G42 /G43 /G44 /G45 /G46 /G43 /G27 /G47 /G48 /G61

6-pin SOT23-6 Outline Dimensions Symbol Dimensions in mm Min. Nom. Max. A 1.0 /c190 1.3 A1 /c190/c190 0.1 A2 0.7 /c190 0.9 b 0.35 /c190 0.50 C 0.1 /c190 0.25 D 2.7 /c190 3.1 E 1.4 /c190 1.8 e /c190 1.9 /c190 H 2.6 /c190 3.0 L 0.37 /c190/c190 /c113 1/c176/c1909/c176 BS801B/02B/04B/06B/08B Rev. 1.00 15 July 7, 2009 /G44 /G48 /G45 /G65 /G41 /G32 /G62 /G41 /G31 /G41 /G43 /G4C /G71

Product Tape and Reel Specifications Reel Dimensions SOP 8N Symbol Description Dimensions in mm A Reel Outer Diameter 330.0/c1771.0 B Reel Inner Diameter 100.0/c1771.5 C Spindle Hole Diameter 13.0 +0.5/-0.2 D Key Slit Width 2.0/c1770.5 T1 Space Between Flange 12.8 +0.3/-0.2 T2 Reel Thickness 18.2/c1770.2 SOP 16N (150mil) Symbol Description Dimensions in mm A Reel Outer Diameter 330.0/c1771.0 B Reel Inner Diameter 100.0/c1771.5 C Spindle Hole Diameter 13.0 +0.5/-0.2 D Key Slit Width 2.0/c1770.5 T1 Space Between Flange 16.8 +0.3/-0.2 T2 Reel Thickness 22.2/c1770.2 BS801B/02B/04B/06B/08B Rev. 1.00 16 July 7, 2009 /G41 /G43 /G42 /G54 /G31 /G54 /G32 /G44

Symbol Description Dimensions in mm A Reel Outer Diameter 330.0/c1771.0 B Reel Inner Diameter 100.0/c1771.5 C Spindle Hole Diameter 13.0 +0.5/-0.2 D Key Slit Width 2.0/c1770.5 T1 Space Between Flange 24.8 +0.3/-0.2 T2 Reel Thickness 30.2/c1770.2 SSOP 20S (150mil) Symbol Description Dimensions in mm A Reel Outer Diameter 330.0/c1771.0 B Reel Inner Diameter 100.0/c1771.5 C Spindle Hole Diameter 13.0 +0.5/-0.2 D Key Slit Width 2.0/c1770.5 T1 Space Between Flange 16.8 +0.3/-0.2 T2 Reel Thickness 22.2/c1770.2 SOT23-6 Symbol Description Dimensions in mm A Reel Outer Diameter 178.0/c1771.0 B Reel Inner Diameter 62.0/c1771.0 C Spindle Hole Diameter 13.0/c1770.2 D Key Slit Width 2.50/c1770.25 T1 Space Between Flange 8.4 +1.5/-0.0 T2 Reel Thickness 11.4 +1.5/-0.0 BS801B/02B/04B/06B/08B Rev. 1.00 17 July 7, 2009

Symbol Description Dimensions in mm W Carrier Tape Width 12.0 +0.3/-0.1 P Cavity Pitch 8.0/c1770.1 E Perforation Position 1.75/c1770.1 F Cavity to Perforation (Width Direction) 5.5/c1770.1 D Perforation Diameter 1.55/c1770.1 D1 Cavity Hole Diameter 1.50 +0.25/-0.00 P0 Perforation Pitch 4.0/c1770.1 P1 Cavity to Perforation (Length Direction) 2.0/c1770.1 A0 Cavity Length 6.4/c1770.1 B0 Cavity Width 5.2/c1770.1 K0 Cavity Depth 2.1/c1770.1 t Carrier Tape Thickness 0.30/c1770.05 C Cover Tape Width 9.3/c1770.1 SOP 16N (150mil) Symbol Description Dimensions in mm W Carrier Tape Width 16.0/c1770.3 P Cavity Pitch 8.0/c1770.1 E Perforation Position 1.75/c1770.1 F Cavity to Perforation (Width Direction) 7.5/c1770.1 D Perforation Diameter 1.55 +0.10/-0.00 D1 Cavity Hole Diameter 1.50 +0.25/-0.00 P0 Perforation Pitch 4.0/c1770.1 P1 Cavity to Perforation (Length Direction) 2.0/c1770.1 A0 Cavity Length 6.5/c1770.1 B0 Cavity Width 10.3/c1770.1 K0 Cavity Depth 2.1/c1770.1 t Carrier Tape Thickness 0.30/c1770.05 C Cover Tape Width 13.3/c1770.1 BS801B/02B/04B/06B/08B Rev. 1.00 18 July 7, 2009 /G50 /G44 /G31 /G57 /G50 /G31 /G50 /G30 /G44 /G45 /G46 /G74 /G4B /G30 /G42 /G30 /G41 /G30 /G43 /G49 /G43 /G20 /G70 /G61 /G63 /G6B /G61 /G67 /G65 /G20 /G70 /G69 /G6E /G20 /G31 /G20 /G61 /G6E /G64 /G20 /G74 /G68 /G65 /G20 /G72 /G65 /G65 /G6C /G20 /G68 /G6F /G6C /G65 /G73 /G61 /G72 /G65 /G20 /G6C /G6F /G63 /G61 /G74 /G65 /G64 /G20 /G6F /G6E /G20 /G74 /G68 /G65 /G20 /G73 /G61 /G6D /G65 /G20 /G73 /G69 /G64 /G65 /G2E /G52 /G65 /G65 /G6C /G20 /G48 /G6F /G6C /G65

Symbol Description Dimensions in mm W Carrier Tape Width 24.0 +0.3/-0.1 P Cavity Pitch 12.0/c1770.1 E Perforation Position 1.75/c1770.10 F Cavity to Perforation (Width Direction) 11.5/c1770.1 D Perforation Diameter 1.5 +0.1/-0.0 D1 Cavity Hole Diameter 1.50 +0.25/-0.00 P0 Perforation Pitch 4.0/c1770.1 P1 Cavity to Perforation (Length Direction) 2.0/c1770.1 A0 Cavity Length 10.8/c1770.1 B0 Cavity Width 13.3/c1770.1 K0 Cavity Depth 3.2/c1770.1 t Carrier Tape Thickness 0.30/c1770.05 C Cover Tape Width 21.3/c1770.1 SSOP 20S (150mil) Symbol Description Dimensions in mm W Carrier Tape Width 16.0 +0.3/-0.1 P Cavity Pitch 8.0/c1770.1 E Perforation Position 1.75/c1770.10 F Cavity to Perforation (Width Direction) 7.5/c1770.1 D Perforation Diameter 1.5 +0.1/-0.0 D1 Cavity Hole Diameter 1.50 +0.25/-0.00 P0 Perforation Pitch 4.0/c1770.1 P1 Cavity to Perforation (Length Direction) 2.0/c1770.1 A0 Cavity Length 6.5/c1770.1 B0 Cavity Width 9.0/c1770.1 K0 Cavity Depth 2.3/c1770.1 t Carrier Tape Thickness 0.30/c1770.05 C Cover Tape Width 13.3/c1770.1 BS801B/02B/04B/06B/08B Rev. 1.00 19 July 7, 2009

Symbol Description Dimensions in mm W Carrier Tape Width 8.0/c1770.3 P Cavity Pitch 4.0/c1770.1 E Perforation Position 1.75/c1770.10 F Cavity to Perforation (Width Direction) 3.50/c1770.05 D Perforation Diameter 1.5 +0.1/-0.0 D1 Cavity Hole Diameter 1.5 +0.1/-0.0 P0 Perforation Pitch 4.0/c1770.1 P1 Cavity to Perforation (Length Direction) 2.00/c1770.05 A0 Cavity Length 3.15/c1770.10 B0 Cavity Width 3.2/c1770.1 K0 Cavity Depth 1.4/c1770.1 t Carrier Tape Thickness 0.20/c1770.03 C Cover Tape Width 5.3/c1770.1 BS801B/02B/04B/06B/08B Rev. 1.00 20 July 7, 2009

Rev. 1.00 21 July 7, 2009 Copyright /c2112009 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek as - sumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holtek/c162s products are not authorized for use as critical components in life support devices or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw. Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Taipei Sales Office) 4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan Tel: 886-2-2655-7070 Fax: 886-2-2655-7373 Fax: 886-2-2655-7383 (International sales hotline) Holtek Semiconductor Inc. (Shenzhen Sales Office) 5F, Unit A, Productivity Building, No.5 Gaoxin M 2nd Road, Nanshan District, Shenzhen, China 518057 Tel: 86-755-8616-9908, 86-755-8616-9308 Fax: 86-755-8616-9722 Holtek Semiconductor (USA), Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538, USA Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holtek.com