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ADNV-6330 Arkusz danych(PDF) 7 Page - Agilent(Hewlett-Packard) |
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ADNV-6330 Arkusz danych(HTML) 7 Page - Agilent(Hewlett-Packard) |
7 / 45 page 7 LASER Drive Mode The laser is driven in pulsed mode during normal operation. A calibration mode is provided which drives the laser in continuous (CW) operation. Eye Safety The ADNS-6030 and the associated components in the schematic of Figure 5 are intended to comply with Class 1 Eye Safety Requirements of IEC 60825-1. Agilent Technologies suggests that manufacturers perform testing to verify eye safety on each mouse. It is also recommended to review possible single fault mechanisms beyond those described below in the section “Single Fault Detection”. Under normal conditions, the ADNS- 6030 generates the drive current for the laser diode (ADNV-6330). In order to stay below the Class 1 power requirements, LASER_CTRL0 (register 0x1a), LASER_CTRL1 (register 0x1f), LSRPWR_CFG0 (register 0x1c) and LSRPWR_CFG1 (register 0x1d) must be programmed to appropriate values. The system comprised of the ADNS-6030 and ADNV-6330, is designed to maintain the output beam power within Class 1 requirements over components manufacturing tolerances and the recommended temperature range when adjusted per the procedure below and implemented as shown in the recommended application circuit of Figure 5. For more information, please refer to Agilent ADNB-6031 and ADNB-6032 Laser Mouse Sensor Eye Safety Application Note AN 5230. LASER Power Adjustment Procedure 1. The ambient temperature should be 25C +/- 5C. 2. Set VDD to its permanent value. 3. Set the Range bit (bit 7 of register 0x1a) to 0. 4. Set the Range_C complement bit (bit 7 of register 0x1f) to 1. 5. Set the Match_bit (bit 5 of register 0x1a) to the correct value for the bin designation of the laser being used. 6. Set the Match_C_bit (bit 5 of register 0x1f) to the complement of the Match_bit. 7. Enable the Calibration mode by writing to bits [3,2,1] of register 0x1A so the laser will be driven with 100% duty cycle. 8. Write the Calibration mode complement bits to register 0x1f. 9. Set the laser current to the minimum value by writing 0x00 to register 0x1c, and the complementary value 0xFF to register 0x1d. 10. Program registers 0x1c and 0x1d with increasing values to achieve an output power as close to 506uW as possible without exceeding it. If this power is obtained, the calibration is complete, skip to step 14. 11. If it was not possible to achieve the power target, set the laser current to the minimum value by writing 0x00 to register 0x1c, and the complementary value 0xff to register 0x1d. 12. Set the Range and Range_C bits in registers 0x1a and 0x1f, respectively, to choose to the higher laser current range. 13. Program registers 0x1c and 0x1d with increasing values to achieve an output power as close to 506uW as possible without exceeding it. 14. Save the value of registers 0x1a, 0x1c, 0x1d, and 0x1f in non-volatile memory in the mouse. These registers must be restored to these values every time the ADNS-6030 is reset. 15. Reset the mouse, reload the register values from non-volatile memory, enable Calibration mode, and measure the laser power to verify that the calibration is correct. Good engineering practices such as regular power meter calibration, random quality assurance retest of calibrated mice, etc. should be used to guarantee performance, reliability and safety for the product design. |
Podobny numer części - ADNV-6330 |
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Podobny opis - ADNV-6330 |
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