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ADNS-7530 Datasheet(PDF) 8 Page - Pixart Imaging Inc. |
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ADNS-7530 Datasheet(HTML) 8 Page - Pixart Imaging Inc. |
8 / 36 page 8 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-7530 integrated molded lead-frame DIP sensor and the associated components in the schematic of Figure 6 are intended to comply with Class 1 Eye Safety Requirements of IEC 60825-1. PixArt Imaging 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 sensor generates the drive current for the VCSEL. 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 ADNS-7530 integrated molded lead-frame DIP sensor which comprised of the sensor and VCSEL; 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 implement- ed as shown in the recommended application circuit of Figure 6. For more information, please refer to Eye Safety Application Note 5361. LASER Power Adjustment Procedure 1. The ambient temperature should be 25C +/- 5C. 2. Set VDD3 to its permanent value. 3. Set the Range bits (bit 7 and 6 of register 0x1a) to b’01. 4. Set the Range_C complement bits (bit 7 and 6 of register 0x1f ) to b’10. 5. Enable the Calibration mode by writing to bits [3,2,1] of register 0x1A so the laser will be driven with 100% duty cycle. 6. Set the laser current to the minimum value by writing 0x00 to register 0x1c, and the complementary value 0xFF to register 0x1d. 7. Program registers 0x1c and 0x1d with increasing values to achieve an output power of not more than 506uW to meet class 1 Eye Safety over temperature. If this power is obtained, the calibration is complete, skip to step 11. 8. 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. 9. Set the Range and Range_C bits in registers 0x1a and 0x1f, respectively, to choose to the higher laser current range. 10. Program registers 0x1c and 0x1d with increasing values to achieve an output power of not more than 506uW to meet class 1 Eye Safety over temperature. 11. 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-7530 is reset. 12. 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, reli- ability and safety for the product design. LASER Output Power The laser beam output power as measured at the naviga- tion surface plane is specified below. The following con- ditions apply: 1. The system is adjusted according to the above procedure. 2. The system is operated within the recommended operating temperature range. 3. The VDD3 value is no greater than 300mV above its value at the time of adjustment. 4. No allowance for optical power meter accuracy is assumed. LASER Output Power Parameter Symbol Minimum Maximum Units Notes Laser output power LOP 716 uW Class 1 limit with recommended VCSEL and lens. PixArt Imaging Inc. ADNS-7530 Integrated Molded Lead-Frame DIP Sensor All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. PixArt Imaging Inc. E-mail: fae_service@pixart.com.tw |
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