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HCS473PQTP Datasheet(PDF) 9 Page - Microchip Technology |
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HCS473PQTP Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 68 page  2002 Microchip Technology Inc. Preliminary DS40035C-page 7 HCS473 FIGURE 2-6: LED PIN DIAGRAM FIGURE 2-7: LCCOM/LCX/LCY/LCZ/ VSST PIN DIAGRAM 2.3 Architectural Overview 2.3.1 WAKE-UP LOGIC The HCS473 automatically goes into a low-power Standby mode once connected to a supply voltage. Power is supplied to the minimum circuitry required to detect a wake-up condition; button activation or LC sig- nal detection. The HCS473 will wake from Low-power mode when a button input is pulled high or a signal is detected on a LC low frequency antenna input pin. Waking involves powering the main logic circuitry that controls device operation. The button and transponder inputs are then sampled to determine which input activated the device. A button input activation places the device into Encoder mode. A signal detected on the transponder input places the device into Transponder mode. Encoder mode has priority over Transponder mode such that communication on the transponder input would be ignored or perhaps interrupted if it occurred simulta- neously to a button activation; ignored until the button input is released. 2.3.2 ENCODER INTERFACE Using the four button inputs, up to 15 unique control codes may be transmitted. LED HV Detect Program Weak LED V DD Mode LCX/LCY/ LCZ Inputs RECTIFIER and REGULATOR V SST 10V 100 Ω LC Input AMP DET and DAMP LCX only 10V 100 Ω BIAS CURRENT LCCOM CLAMP RDAMP Note: S3 may not be used as a button input if the RFEN option is enabled. |
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