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ADNS-7700-HAMY Datasheet(PDF) 10 Page - AVAGO TECHNOLOGIES LIMITED |
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ADNS-7700-HAMY Datasheet(HTML) 10 Page - AVAGO TECHNOLOGIES LIMITED |
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10 / 60 page  10 Block Diagram ZB ZA IMAGE PROCESSOR Z-WHEEL POWER ON RESET V O L T A G E R E G U L A T O R LASER_GND VCSEL +VE OSCILLATOR OSC_IN OSC_OUT D D + USB PORT 5-VOLT USB VBUS POWER B4 B3 B1 B5 REFC LASER DRIVE OSCILLATOR CONTROL AND I/O PROCESSOR TW1 TW2 B2 REFA REFB VDD5 DGND AGND VCSEL VE VOLTAGE REFERENCE VCSEL LASER BUTTONS TILT WHEEL* Figure 7. ADNS-7700 Block Diagram Eye Safety ADNS-7700 sensor and the associated components in the schematic of Figure 6 are intended to comply with Class 1 Eye Safety requirements of IEC/EN 60825-1. Avago Technologies calibrate sensor laser output power (LOP) to Class 1 eye safety level prior shipping out, thus no laser output power calibration is required at mouse manufac- turer site. ADNS-7700 sensor is designed to maintain the laser output power using ADNS-6180-002 lens within Class 1 requirements over components manufacturing toleranc- es under the recommended operating conditions and ap- plication circuit of Figure 6 as specified in this document. Under normal operating conditions, the sensor gener- ates the drive current for the VCSEL. Increasing the LOP by other means on hardware and software can result in a violation of the Class 1 eye safety limit of 716 W. For more information, please refer to Eye Safety Application Note. Laser Output Power The laser output power,LOP can be measured at the navi- gation surface plane. The sensor can drive the laser in continuous (CW) mode by writing to LSR_CTRL0 and LSR_ CTRL1 registers via USB Set Vendor test command. The pre-calibrated LOP value at typical operating supply voltage and temperature of 25 ± 5°C should not exceed- ing 506 W, otherwise the LOPmax limit in the Absolute Maximum Rating is applicable. The following conditions apply: 1. The system is operated based on the recommended application circuit in Figure 6 and within the recom- mended operating conditions. 2. Measurement is taken at the optical center and illumi- nation angle on navigation surface plane, Z. 3. No allowance for optical power meter accuracy is assumed. Single Fault Detection ADNS-7700 sensor is able to detect a short circuit or fault condition at the -VCSEL pin, which could lead to exces- sive laser power output. A path to ground on this pin will trigger the fault detection circuit, which will turn off the laser drive current source and set the LASER_NEN output high. The system will prevent excess laser power for a re- sistive path to ground at -VCSEL by shutting off the laser. In addition to the ground path fault detection described above, the fault detection circuit is continuously check- ing for proper operation by internally generating a path to ground with the laser turned off via LASER_NEN. If the -VCSEL pin is shorted internally to VDD3 or externally to REFB, this test will fail and will be reported as a fault. |
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