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LA9242M Datenblatt(PDF) 9 Page - Sanyo Semicon Device |
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LA9242M Datenblatt(HTML) 9 Page - Sanyo Semicon Device |
9 / 20 page LA9242M No.7097–9/20 11. DEFECT The mirrored surface level is maintained by the capacitor for LF2 (pin 59) ; when a drop in the EFM signal (RFSM output) reaches 0.35V or more, a high signal is output to DEF (pin 49). If DEF (pin 49) goes high, the tracking servo enters THLD mode. In order to prevent the tracking servo from entering THLD mode when a defect is detected, prevent DEFECT from being output by either shorting DEF (pin 49) to GND, or shorting LF2 (pin 59) to GND. The DEFECT output is driven by constant current (approximately 100 µA). 12. Microcontroller interface Because the Reset (Nothing) command initializes the LA9242M, it must be used carefully. The LA9242M command acceptance (mode switching) timing is defined by the internal clock (4.23MHz divided to 130kHz) after the falling edge of CE (RWC) ; therefore, when commands are sent consecutively, CE must go low for at least 10 µs. The 4.23MHz clock is required for that reason. 2BYTE-COMMAND DETECT and 2BYTE- COMMAND RESET are used only for the purpose of masking two-byte data. All instructions can be input by setting CE high and sending commands synchronized with the CL clock from the microcontroller to DAT (pin 52) in LSB first format. Note that the command is executed at the falling edge of CE. Timing * The DSP pin names are shown in parentheses. 13. Reset circuit The power-on reset is released when VCC exceeds approximately 2.6V. 14. Pattern design notes To prevent signal jump-in from CV+ (pin 40) to RFSM (pin 41), a shielding line is necessary in between. 15. VCC /REF/GND/NC VCC1 (pin 64) : RF system VCC2 (pin 56) : SERVO system, DIGITAL system AGND (pin 22) : RF system, SERVO system DGND (pin 45) : DIGITAL system NC (pin 23, 48) : No connection VR (pin 58) : Refered voltage EFM signal LF2 (pin 59) DEF (pin 59) (RFSM output) 0.35V CE(RWC) CL(CQCK) DAT(COIN) LSB MSB |
Ähnliche Teilenummer - LA9242M |
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Ähnliche Beschreibung - LA9242M |
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