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LA9230 Arkusz danych(PDF) 10 Page - Sanyo Semicon Device |
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LA9230 Arkusz danych(HTML) 10 Page - Sanyo Semicon Device |
10 / 20 page 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 0.35 V 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. Microprocessor interface Because the Reset (Nothing) command initializes the LA9230M and the LA9231M, it must be used carefully. The LA9230M/LA9231M command acceptance (mode switching) timing is defined by the internal clock (4.23 MHz divided to 130 kHz) after the falling edge of CE (RWC); therefore, when commands are sent consecutively, CE must go low for at least 10 µsec. / The 4.23 MHz 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 microprocessor to DAT (pin 52) in LSB first format. Note that the command is executed at the falling edge of CE. 13. Reset circuit The power-on reset is released when VCC exceeds approximately 2.8 V. 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 (pins 46*, 47, 48, and 55) : No connection *Only for LA9230M EFM signal (RFSM output) LF2 (pin 59) DEF (pin 49) Timing *The DSP pin names are shown in parentheses. LA9230M/9231M No.5189 - 10/20 |
Podobny numer części - LA9230 |
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Podobny opis - LA9230 |
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