Ben NanoNote Waveforms

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Here we describe the Ben NanoNote (LB60) waveforms, running the original proprietary dictionary software. Those measurements are activated by software or hardware itself to decide its waveform; Each has its description; although this file is trying to explain how Ben can work by porting critical gpio's status, but also this can be faced as identical behaviour for avt2 reference board.

Label descriptions:

  • ch1 or ch2: what signal or net of schematic is measured
  • trigger duration: those two signals are measured by using trigger ch1 or ch2, and explain that what its original status or specified status in advance
  • description: describes signals' behaviour

Measurement Equipment: Those waveforms are measured by Tektronix TDS1012


Waveform #1
  • ch1: pin 3 (D) of Q3 TM2302FN
  • ch2: pin 1 of U5 SE9016
  • trigger duration: measuring during put battery cell (0V) enter, the usb pwr cable is plugged in advance
  • description: Once ch2's signal is chaning from HIGH to LOW, the RED LED will light.Notice that at this transit meanwhile the Q3 is close due to PW_ON_N (0V), so the charging resistor will be only R15. Please ref. to waveform #2.



Waveform #2
  • ch1: PWR_ON_N / pin 125 of of jz4720
  • ch2: pin 1 of U5 SE9016
  • trigger duration: measuring during put battery cell (0V) enter, the usb pwr cable is plugged in advance
  • description = once ch2's signal is chaning from HIGH to LOW, the RED LED will light.Notice that at this transit meanwhile the Q3 is close due to PW_ON_N (0V), so the charging resistor will be only R15.



Waveform #3
  • ch1: CHARGE_N / GPC27 of jz4720
  • ch2: pin 1 of U5 SE9016
  • trigger duration: measuring during put battery cell (0V) enter, the usb pwr cable is plugged in advance
  • description = once ch2's signal is chaning from HIGH to LOW, the RED LED will light.



Waveform #4
  • ch1: VRTC
  • ch2: VBATO
  • trigger duration: measuring during the usb pwr cable is plugged in
  • description: this VBATO is coming through from VBUS, thus usb power; so VRTC has almost the same time from VBUS in this condition, the VRTC will reach around 3.3V; this measurement is done by trigger at its level 1.28V.



Waveform #4.1
  • ch1: VRTC
  • ch2: VBATO
  • trigger duration: measuring during the usb pwr cable is plugged in
  • description: this only added time cursors for reference.



Waveform #5
  • ch1: VRTC
  • ch2: PW_ON_N / pin 125 of jz4720
  • trigger duration: measuring during the usb pwr cable is plugged in
  • description: the PW_ON_N is changing initially when VRTC comes into cpu core, it shows real low.



Waveform #6
  • ch1: VRTC
  • ch2: PWEN / pin 3 (D) of Q2 TM2301FN
  • trigger duration: measuring during the usb pwr cable is plugged in
  • description: the PWEN works in reversing PW_ON_N. When this PWEN works at high level, it enables U2/U3 (EUP3406) to output 3.3V & 1.8V, thus enable Nand flash, SDRAM, partly inside of cpu;this almost let PWEN got high level after 56us duration from VRTC.



Waveform #7
  • ch1: VRTC
  • ch2: V18
  • trigger duration: measuring during the usb pwr cable is plugged in
  • description: the 1.8V is coming up about 260us after VRTC.



Waveform #8
  • ch1: VRTC
  • ch2: V33
  • trigger duration: measuring during the usb pwr cable is plugged in
  • description: the 3.3V is coming up about 284us after VRTC.



Waveform #9
  • ch1: PWEN
  • ch2: V33
  • trigger duration: measuring during the usb pwr cable is plugged in
  • description: the 3.3V is coming up about 44us after PWEN coming HIGH.



Waveform #10
  • ch1: WAKEUP_N / pin 124 of jz4720
  • ch2: PWEN
  • trigger duration: measuring during WAKEUP_N getting from High to LOW, means pressing the on/off key when device is working on power on mode(thus PWEN = HIGH )
  • description: PWEN comes LOW to power off mode about 260ms after WAKEUP_N is activating in falling edge LOW. this can be achieved by software behaviour, like display power saving mode, etc. Shut down 3.3V & 1.8V supply.



Waveform #11
  • ch1: WAKEUP_N / pin 124 of jz4720
  • ch2: PWEN
  • trigger duration: measuring during WAKEUP_N getting from HIGH to LOW, means pressing the on/off key when device doesn't work on power on mode( thus PWEN = LOW )
  • description: PWEN comes HIGH to power off mode about 48ms after WAKEUP_N is activating in falling edge LOW. this can be achieved by software behaviour, like turn on display power, nand flash & sdram, etc. Thus 3.3V & 1.8V supply.



Waveform #12
  • ch1: SHUTDOWN / pin 1 (OUT) of U7 BL8506-30NRM
  • ch2: PWEN
  • trigger duration: measuring during battery's voltage goes down almost 2.94V(Minimum detect threshold)
  • description: this waveform shows you that when battery's voltage is achieving at 2.94V(Minimum detect threshold), the device must start go to store and process software tasks then device either turns into power off mode or directly shutdown. No matter what it will be you want, you should let PW_ON_N to be HIGH (PWEN = LOW). This shows needed 4.2s to let PWEN LOW after U7 detected VBATO ( battery voltage ) coming down at range 2.94V~3.06V.


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