盛群半導體股份有限公司 ● Demo Board–Bottom Side HOLTEK SEMICONDUCTOR INC. HOLTEK Touch Key IC Demo Board BS801B User Manual ● Demo Board–Top Side JP1 VDD KOUT VSS VDD 1 2 3 PAD CON3 LED1 R2 N.C. IC1 Cref VDD R1 2.7K KOUT 1 2 PAD Key 3 KOUT LHF VSS VDD Key Cref 6 VDD 5 4 + BAT1 CR2032 LHF BS801B_SOT23-6 CS 4pF C1 0.1uF - VSS <LHF Option> Open: Level Hold. Short: Toggle. -1- -2- ● Pull out the insulator between battery and battery holder to power up the Demo Board. (Ensure that not touching any component when doing this.) When in use the following problems may be encountered: Problem Potential Solution ● After a key touch action has been verified then the output indicator LED1 and the KOUT pin will be activated with a LEVEL HOLD output. ● The relationship between LHF, the output LED1 status and the KOUT pin is shown in the following table: 1. LHF floating – selects Level Hold output Touch Key KOUT pin status when LED1 Condition connected to pull-high Key is touched On 0V Key is not touched Off 3.0V 2. LHF pulled low – selects Toggle output Touch Key KOUT pin status when LED1 Condition connected to pull-high Key is touched Changes State Changes state Key is not touched No change Remains in present state battery is installed Abnormal LED action LED uneven Check that whether the battery is not inserted correctly or with the wrong polarity, has poor contacts or has no power. When a touch action results in abnormal LED illumination, re-install the battery to re-activate or wait for about 40 seconds after which the LED will automatically extinguish. The CR2032 is low on power and should be replaced. ● Accessories BS801B Touch Key IC Demo Board (includes a BS801B SOT23-6 IC) x 1 CR2032 Battery x 1 User Manual x 1 ● Specifications ● Using "Touch PAD sensitivity adjust connections" to modify the sensitivity of each key. ● ● ● ● No actions after Model : BS801B_DemoV100 Keys : 1 KEY Battery : CR2032 Lithium Battery Power Consumption : 1.5μA ( Standby Mode ) 3.0μA ( Normal Mode ) Size : 44mm (H) x 40mm (W) x 11mm (D) Verify the Touch Key sensitivity and response time. Determine the Sense PAD external casing material thickness. Determine the sense PAD area. Test the Touch Key IC Specification Characteristics. ● Provide the customer with a Touch Key related PCB Layout for consultation. For more information about the touch Key IC, please visit our web site at ● Provide the customer with a demonstration and evaluation. http://www.holtek.com.tw/touchkey -3- -4-