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Recent content by jeetz_mail

  1. J

    How to use 4 EEPROMs that have 1 address bit (I2C)

    Thanks a bunch. Very nicely explained.
  2. J

    How to use 4 EEPROMs that have 1 address bit (I2C)

    What do you mean by"scl and sda lines paralleled" and "use 4 io lines for e2"? Please elaborate. - - - Updated - - - This is a feasible idea. Thanks.
  3. J

    How to use 4 EEPROMs that have 1 address bit (I2C)

    Hi I am trying to connect multiple (4) EEPROMs (M24M02) on the I2C lines. The M24M02 has only one address bit. Is there any way or trick that I can use 4 of these as I2C slaves? Thanks.
  4. J

    Slow Ramp Generator Design

    Hi SherpaDoug, The ramp generator circuit output will be connected to the input of an ADC (inside an ASIC chip). I intend to characterize the performace of the ADC. A slow ramp voltage signal at the ADC input will be started. ADC measurement will be initiated for a duration equal to the ramp...
  5. J

    Slow Ramp Generator Design

    I want to design a slow ramp generator with the following specifications: Type of ramp – starting voltage 0V, ending voltage 1.22V, ramp time ~17.7 seconds. I also want the ending voltage to be variable such as 1.744V, 2.44V, 3.0V etc. Please give me suggestions on how to design this circuit...
  6. J

    PFET Self-turn ON issue

    Thanks. But I can't use the circuit of Fig3 as it won't work in my application. My application is: I have 3 components to start with, charger, charger connector and battery. I want to connect the battery to the charger connector, only when the charger is connected. When the charger is removed...
  7. J

    PFET Self-turn ON issue

    I have a resistor between the DRAIN of PFET and GND. Did you mean the Drain of NFET and Gnd ?
  8. J

    PFET Self-turn ON issue

    Hello Erikl I am currently in the process of the prototyping the following circuit: ImageShack® - Online Photo and Video Hosting However, my hunch is that, even with nFET (used as open collector type), PFET will feed back and keep itself on when the charger is removed. Thanks Jeet...
  9. J

    PFET Self-turn ON issue

    Hi I recognize that I wasn't connecting the Source of the PFET on the high side. Even if I attach the source on the high side (see the following link), the problem still remains. When the charger is removed (notice that PFET is ON at that instant), the PFET will feed back VBAT to Vchrg and...
  10. J

    PFET Self-turn ON issue

    Sure. Please click on the following link to see the circuit image. Imageshack - circuitn.jpg Thanks. Jeet ---------- Post added at 10:00 ---------- Previous post was at 09:58 ---------- Hello mvs The reason I have "PFET Source" on the battery side is that when the charger is removed, VBAT...
  11. J

    PFET Self-turn ON issue

    Hi Please see the attached file for my circuit. Circuit description: I am trying to charge a battery through a PFET switch, Q2. When charger is connected, it pulls Vcharger high, which causes the inverter output to be low and turns Q2 ON. The problem is that when the charger is removed, Q2...
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