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TLV6710: Issue with under voltage condition of TLV6710

Anup Patil
Prodigy 20 points
Part Number: TLV6710


I have designed a circuit with TLV6710DDCR IC to control the charging cycle of a coin cell battery MS621FE. The resistor combination has been chosen to meet the target voltage of Vmon(OV): 3.01V and Vmon(UV):2.01V (R1: 604K, R2:49.9K, R3:100K, RP1:10K) considering IDD=4uA. The Vmon(OV) is happening as per the calculation (Getting logic low OUTA&OUTB at 3.01V input) but there is an issue with Vmon(UV) instead of getting logic high at 2.01V it's happening at 2.91V/2.92V. 

Post that assumed the current consumption of 4uA selection might cause the issue, the calculation has been revised with (R1: 240K, R2:20K, R3:41.2K, RP1:50K) considering IDD: 10uA (max IDD as per datasheet 11uA) to meet the target voltage of Vmon(OV): 2.92V and Vmon(UV):1.96V but the same issue is repeating with Vmon(UV), instead of getting logic high at 1.96V it's happening at 2.91V/2.92V. 

I'm attaching the schematic for your reference, help to understand the problem and to get the right combination resistor to meet the target values Vmon(OV): 3.01V (logic low on OUTA&OUTB) & Vmon(UV):2.01V (logic high on OUTA&OUTB). 

thanks 

Narendraprasath

  • 0
    TI__Genius 11701 points

    Hi Narendrapasath,

    Thank you for reaching out. I do not see anything wrong with your calculations, as I am able to see the targeted UV and OV thresholds in simulation.

    Are you seeing this in simulation or on breadboard/PCB? If you are seeing it on the board, can you show waveform captures? And how are you testing/probing the pins?

    tlv6710_window.TSC

  • 0 in reply to Chi Nguyen1
    Prodigy 20 points

    Hi Chi Nguyen,

    Thanks for your reply, I'm testing it on PCB by connecting the digital oscilloscope probe on the pins with the help of an extended small piece of wires.

    I adjusted the voltage using the variable power supply, and connections as per the below image without the battery in the circuit. 

    This is the waveform captured in the oscilloscope for your reference along with the video attached. This result is for the resistor combination of (R1: 240K, R2:20K, R3:41.2K, RP1:50K). A similar result for the resistor combination 1 as well  (R1: 604K, R2:49.9K, R3:100K, RP1:10K)

  • 0 in reply to Anup Patil
    TI__Genius 11701 points

    Hi Narendrapasath,

    Thanks for the follow up. Unfortunately, I can't really see the exact points where the output transitions and what the issue is. It looks like the output is low when the input is above 2.92V and high when the input is above 1.96V (but below 2.92V), which is expected.  Can you zoom in on the wave forms? I am curious to see the transitions above Vmon(UV) and Vmon(OV) and back below them.

  • 0 in reply to Chi Nguyen1
    TI__Genius 11701 points

    Hi Narendrapasath,

    We haven't heard back from you so I am going to close this post. Feel free to reply back if you have any further questions.

    -Chi