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Array Photometer Circuit Design and Interface

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

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Array Photometer Circuit Design and Interface

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

  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. Trigger sequence S_MODE_SPRITE2 S_MODE_SPRITE20 20KHz 20KHz 2 KHz 82 ms 18ms Triggered by Cloud Flash 18 ms Triggered by Sprites 10 ms

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

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

  6. DATA_ENB T1 DATA_CLOCK DATA_A B11 B10 B0 MSB LSBB11 B10 B11 B0 DATA_B MSB LSB - 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. CMD_CLK+ AP CMD_CLK- AEP Receive: DS26C32 (NS) CMD_DATA+ CMD_DATA- CMD_STB+ CMD_STB- [ RS-422 ] Serial Command Interface

  8. APPROX 13 us 500ns 250ns CMD_CLK 250ns LSB MSB DO9 C5 C3 C2 DO15 DO14 DO13 DO8 DO7 DO6 DO5 DO4 DO3 DO11O11 DO10 DO12 C7 C6 C4 C1 C0 DO2 DO0 DO1 CMD_DATA 500ns 500ns CMD_STB COMMAND DATA COMMAND - 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. ARRAY PHOTOMETER AEP/AP COMMAND INTERFACE MODE Command Name OPERATION COMMAND CODE Change Sampling Mode S_MODE_SPRITE20 SPRITE MODE 20KHz SAMPLING 60 hex S_MODE_SPRITE2 SPRITE MODE 2KHz SAMPLING 61 hex S_MODE_AURORA AURORA MODE 200Hz SAMPLING 62 hex High Voltage Control HV_LOW_A CHANNEL A HV = TBD (LOW VOLTAGE) 68 hex HV_LOW_B CHANNEL B HV = TBD (LOW VOLTAGE) 69 hex HV_MID_A CHANNEL A HV = TBD (MID VOLTAGE) 6A hex HV_MID_B CHANNEL B HV = TBD (MID VOLTAGE) 6B hex HV_HIGH_A CHANNEL A HV = TBD (HIGH VOLTAGE) 6C hex HV_HIGH_B CHANNEL B HV = TBD (HIGH VOLTAGE) 6D hex HV_OFF_A CHANNEL A HV = 0V (OFF) 6E hex HV_OFF_B CHANNEL B HV = 0V (OFF) 6F hex Calibration CAL_ON CALIBRATION ON 78 hex CAL_OFF CALIBRATION OFF 79 hex ANALOG HOUSEKEEPER LINE MULTIPLEX ANA_HKP_MUX DO15:+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

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

  11. APPROX. 13.5 us CMD_CLK (FROM DPU) CMD_DATA (FROM DPU) (HI-Z) C3 C4 C5 C2 C0 C6 C7 C1 (HI-Z) CMD_DATA (TO DPU) DI2 DI14 DI3 DI0 DI15 DI13 DI5 DI11 DI9 DI10 DI8 DI4 DI1 DI12 DI6 DI7 CMD_DCOE (REF) (L = READBACK : H = COMMAND) CDI_STB (FROM DPU) COMMAND READBACK

  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. TRIGGER+ AP TRIGGER - AEP Drive: DS26C32 (NS) DAYLIGHT + DAYLIGHT - [ RS-422 ] 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 Data Range ANA-HKP Range +5V 0 - +7 V 0 - +5 V +12V 0 - +7 V 0 - +5 V -12V 0 - +7 V 0 - +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&2 223 mW PCB P3&4 2,623 mW PCB P5 5,311 mW DC/DC Conv. 1,600 mW HV PS 3,800 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

  18. Wavelength range Max sensitivity wavelength: 405 nm (blue)550 nm(red) 1 % bandwidth of max sensitivity: 340-470 nm520-810 nm

  19. 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 nm 38.4 [electrons/0.1ms] SNR 15.3/0.65 = 24 38.4/0.65 = 59

  20. for 10 MR elves with 400 km width ar 2500 km range red @700 nm 42 [electrons/0.1ms] blue @400 nm 300 [electrons/0.1ms] SNR 42/0.65 = 64 300/0.65 = 460

  21. 10 kR aurora/airglow where fc(LPF) = 100 Hz equivalent SQRT(dark counts) ~ 6.5 [electrons/0.01s] 200 [electrons/10 ms] @550 nm SNR 200/6.5 = 30

  22. Operating Temperatures Non-operating Temperatures -20℃to+30℃ -35℃ to +50℃ 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

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