1. Array Photometer Circuit Design and Interface Tohoku University CDR Meeting, July 2001

2. Data acquisition mode a. Sprite 1 Mode : S_MODE_SPRITE2 sampling rate=20KHz, fc(LPF)=10 KHz b. Sprite 2 Mode : S_MODE_SPRITE20 sampling rate=2KHz, fc(LPF)=10KHz c. Auroral Mode : S_MODE_AURORA sampling rate=200Hz, fc(LPF)=100Hz Science data format is 12 bits serial. Nominal DATA_CLK frequency is 5MHz.

3. 2 KHz20KHz 18ms 82 ms S_MODE_SPRITE2S_MODE_SPRITE20 18 ms 10 ms Trigger sequence Triggered by Cloud Flash Triggered by Sprites

4. Functional Diagram for Array Photometer 8 ch 10KHz, 1KHz, 100Hz

5. AEPAP DATA_CLK+ DATA_CLK- DATA_A+ DATA_B+ DATA-A- DATA-B- DATA_ENB++ DATA-ENB- Drive: DS26C31 (NS) [ RS-422 ] Science Data Interface

6. - Clock Rate is nominal 5MHz(duty 50%) - All signals RS-422 - All signals driven low except driving transfer - All changes data on falling edge of DATA_CLOCK - AEP reads data on rising edge of DATA_CLOCK - Data length 12bits

7. AP CMD_CLK+ CMD_CLK- CMD_DATA+ CMD_DATA- CMD_STB+ CMD_STB- Receive: DS26C32 (NS) [ RS-422 ] AEP Serial Command Interface

8. - CLOCK RATE is nominal 2MHz (duty 50%) - All signals are provided by RS-422 - Command format is 8 bits - Data format is 16 bits

9. MODECommand NameOPERATIONCOMMAND CODE Change Sampling ModeS_MODE_SPRITE20SPRITE MODE 20KHz SAMPLING60 hex S_MODE_SPRITE2SPRITE MODE 2KHz SAMPLING61 hex S_MODE_AURORAAURORA MODE 200Hz SAMPLING62 hex High Voltage ControlHV_LOW_ACHANNEL A HV = TBD (LOW VOLTAGE)68 hex HV_LOW_BCHANNEL B HV = TBD (LOW VOLTAGE)69 hex HV_MID_ACHANNEL A HV = TBD (MID VOLTAGE)6A hex HV_MID_BCHANNEL B HV = TBD (MID VOLTAGE)6B hex HV_HIGH_ACHANNEL A HV = TBD (HIGH VOLTAGE)6C hex HV_HIGH_BCHANNEL B HV = TBD (HIGH VOLTAGE)6D hex HV_OFF_ACHANNEL A HV = 0V (OFF)6E hex HV_OFF_BCHANNEL B HV = 0V (OFF)6F hex CalibrationCAL_ONCALIBRATION ON78 hex CAL_OFFCALIBRATION OFF79 hex ANALOG HOUSEKEEPER LINE MULTIPLEX ANA_HKP_MUXDO15:+5V VOLTAGE MONITOR 7A hex DO14:+12V VOLTAGE MONITOR DO13:-12V VOLTAGE MONITOR DO12:PM1 TEMP MONITOR(PM1 room) DO11:PM2 TEMP MONITOR(PM2 room) DO10:CONT TEMP MONITOR(Control room) DO9 :CHANNEL A HV MONITOR DO8 :CHANNEL B HV MONITOR ARRAY PHOTOMETER AEP/AP COMMAND INTERFACE

10. AP CMD_CLK+ CMD_CLK- READBACK(CMD_DATA+) READBACK(CMD_DATA-) CMD_STB+ CMD_STB- Drive: DS26C31 (NS) [ RS-422 ] AEP Readback Interface

12. Readback Data DI15 : SPRITE MODE 20KHz SAMPLING DI14 : SPRITE MODE 2KHz SAMPLING DI13 : AURORA MODE 200Hz SAMPLING DI12 : CH_A_HV=LOW DI11 : CH_B_HV=LOW DI10 : CH_A_HV=MID DI9 : CH_B_HV=MID DI8 : CH_A_HV=HIGH DI7 : CH_B_HV=HIGH DI6 : CH_A_HV=OFF DI5 : CH_B_HV=OFF DI4 : CALIBRATION ON DI3 : CALIBRATION OFF DI2 : TOGGLE BIT(Alternate this bit with readback)

13. AP TRIGGER+ TRIGGER - DAYLIGHT + DAYLIGHT - Drive: DS26C32 (NS) [ RS-422 ] AEP Discrete Signal Interface -Trigger: Start sampling - Daylight: HV of AP shall be off according to the DAYLIGHT signal from AEP

14. DAYLIGHT - AP does not have any shutter or caps. - High Voltage power supply of AP shall be off when it receives daylight pulse issued by AEP

15. HK DataRangeANA-HKP Range +5V0 - +7 V0 - +5 V +12V0 - +7 V0 - +5 V -12V0 - +7 V0 - +5 V PM1 Temparature -50  C - +50  C 0 - +5 V PM2 Temparature -50  C - +50  C 0 - +5 V CNT Temparature -50  C - +50  C 0 - +5 V CH_A High Voltage -1,250  C - 0 V 0 - +5 V CH_B High Voltage -1,250  C - 0 V 0 - +5 V Analog Signal Interface

16. Power Requirements Supply Voltage from the ISUAL : +28V +7/-6V Power Dissipation : 16.4W (observation), 12.6W(stand-by) PCB P1&2223 mW PCB P3&42,623 mW PCB P55,311 mW DC/DC Conv.1,600 mW HV PS3,800 mW ( 0 mW @stand-by)

17. Environmental Tests before delivery to UCB - Thermal Cycling Ambient Pressure Test - Random Vibration Test - Shock Test -Vacuum Test (at Ambient Temp) -EMC/EMI : conducted emission on power lines test only

19. Wavelength range Max sensitivity wavelength: 405 nm (blue)550 nm(red) 1 % bandwidth of max sensitivity: 340-470 nm 520-810 nm

20. Electron Counts where fc(LPF)=10kHz equivalent SQRT(dark counts) ~ 0.65 [electrons/0.1ms] for 30 MR sprites with 50 km width at 2500 km range red @700 nm 15.3 [electrons/0.1ms] blue @400 nm38.4 [electrons/0.1ms] SNR15.3/0.65 = 24 38.4/0.65 = 59

21. for 10 MR elves with 400 km width ar 2500 km range red@700 nm42 [electrons/0.1ms] blue@400 nm 300 [electrons/0.1ms] SNR42/0.65 = 64 300/0.65 = 460

22. 10 kR aurora/airglow where fc(LPF) = 100 Hz equivalent SQRT(dark counts) ~ 6.5 [electrons/0.01s] 200 [electrons/10 ms] @550 nm SNR200/6.5 = 30

23. Mounting Interface Temperature Limits Mass of Electronic Board P1&&2: 200 g, P3&4: 350 g, P5: 350 g HV PS: 140 g, DC/DC: 30 g, LineFilter: 50 g Operating Temperatures Non-operating Temperatures -20 ℃ to +30 ℃ -35 ℃ to +50 ℃