盛群半導體股份有限公司 ● Demo Board–Bottom Side HOLTEK SEMICONDUCTOR INC. HOLTEK Touch Key IC Demo Board BS802B User Manual ● Demo Board–Top Side R1 2.7K LED1 R3 KOUT0 VDD PAD N.C. R2 2.7K LED2 Cref KOUT1 Key1 Key0 IC1 1 PAD KOUT1 2 KOUT0 3 4 CS 4pF Key 0 Cref KOUT1 Key 1 KOUT0 VDD VSS LHF PAD 8 7 VDD 6 VDD 5 + BS802B_8SOP JP1 1 2 3 4 CON4 -1- LHF VDD KOUT0 KOUT1 VSS <LHF Option> Open: Level Hold. Short: Toggle. C1 0.1uF - BAT1 CR2032 VSS -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 LED1~2 and the KOUT0~1 pins will be activated with a LEVEL HOLD output. ● The relationship between LHF, the output LED1~2 status and the KOUT0~1 pins is shown in the following table: 1. LHF floating – selects Level Hold output Touch Key KOUT x pin status when LED n Condition connected to pull-high Key x is touched On 0V Key x is not touched Off 3.0V 2. LHF pulled low – selects Toggle output Touch Key KOUT x pin status when LED n Condition connected to pull-high Key x is touched Changes State Changes state Key x is not touched No change Remains in present state Note: “x” means 0 or 1; “n” means 1 or 2 ● Using "Touch PAD sensitivity adjust connections" to modify the sensitivity of each key. battery is installed ● ● ● ● 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. No actions after 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 BS802B Touch Key IC Demo Board (includes a BS802B 8SOP IC) x 1 CR2032 Battery x 1 User Manual x 1 ● Specifications Model : BS802B_DemoV100 Keys : 2 KEY Battery : CR2032 Lithium Battery Power Consumption : 2.0μA ( Standby Mode ) 5.0μA ( Normal Mode ) Size : 44mm (H) x 40mm (W) x 11mm (D) ● 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-