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SM5221 Scheda tecnica(PDF) 3 Page - SamHop Microelectronics Corp. |
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SM5221 Scheda tecnica(HTML) 3 Page - SamHop Microelectronics Corp. |
3 / 16 page Page 3 FUNCTION DESCRIPTION (1) Oscillation BLOCK DIAGRAM V.2.0 Mar 8,2002 KEY INPUT/OUTPUT SCAN CIRCUIT OSC CIRCUIT KEY INPUT SCAN CIRCUIT OUTPUT CONTROL CIRCUIT OSCI OSCO DOUT CODE GENERATION CIRCUIT TIMING GENERATION & CONTROL CIRCUIT VDD Vss CODE LED KI/O0 KI/O1 KI/O2 KI/O3 KI/O4 KI/O5 KI/O6 KI/O7 SEL KI3 KI0 KI1 KI2 OSCO C2 OSCI C1 The SM5221-001/002 oscillation circuit is designed for use of a 400 kHz or 500 kHz ceramic resonator, but there may be mutual influence between variations in the IC and ceramic resonator resulting in abnormal oscillation. The oscillation circuit starts to operate when a key is depressed. SM5221-001/002 32 KEYS ENCODER SAMHOP Microelectronics Corp. 三合微科股份有限公司 |
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