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ADNS-6120 Datasheet(PDF) 7 Page - AVAGO TECHNOLOGIES LIMITED |
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ADNS-6120 Datasheet(HTML) 7 Page - AVAGO TECHNOLOGIES LIMITED |
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7 / 52 page  7 Parameter Symbol Minimum Maximum Units Notes Laser output power LOP 716 uW Per conditions above Single Fault Detection ADNS-6010 is able to detect a short circuit, or fault, condition at the RBIN and XY_LASER pins, which could lead to excessive laser power output. A low resistance path to ground on either of these pins will trigger the fault detection circuit, which will turn off the laser drive current source and set the LASER_NEN output high. When used in combination with external components as shown in the block diagram below, the system will prevent excess laser power for a single short to ground at RBIN or XY_LASER by shutting off the laser. Refer to the PC board layout notes for recommendations to reduce the chance of high resistance paths to ground existing due to PC board contamination. In addition to the continuous fault detection described above, an additional test is executed automatically whenever the LP_CFG0 register is written to. This test will check for a short to ground on the XY_LASER pin, a short to VDD3 on the XY_LASER pin, and will test the fault detection circuit on the XY_LASER pin. Figure 6. Single Fault Detection and Eye-safety Feature Block Diagram RBIN LASER_NEN XY_LASER GND ADNS-6010 LASER DRIVER VDD3 LASER Microcontroller RESET NPD voltage sense current set VDD3 fault control block LASER Output Power The laser beam output power as measured at the navi- gation surface plane is specified below. The following conditions apply: 1. The system is adjusted according to the above pro- cedure. 2. The system is operated within the recommended op- erating temperature range. 3. The VDD3 value is no greater than 50mV above its value at the time of adjustment. 4. No allowance for optical power meter accuracy is as- sumed. Disabling the LASER LASER_NEN is connected to the base of a PNP transistor which when ON connects VDD3 to the LASER. In normal operation, LASER_NEN is low. In the case of a fault con- dition (ground at XY_LASER or RBIN), LASER_NEN goes high to turn the transistor off and disconnect VDD3 from the LASER. |
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