TPL5110-Q1: Power down after 8 seconds with no input

I am looking to use the TPL5110 chip.

I am not using a microcontroller in my circuit.

I am currently using the LMC555CTP but in is draining a cr2032 3v 220mah battery after 2 months. See schematic below. 

About the circuit.

The circuit will let the 3v pass through to a remote control to transmit a signal, batteries usually last 2 years. When there is motion or vibration the circuit will "power on" the remote.  It with shut down the power after 8 seconds of being stationary with no vibration.  

In my current design an LMC555CTP is connected to a vibration switch.  If I replace it with a TPL5110 which is rated as 35nA as opposed to 130uA the battery will last a great longer.

1. How do I generate an automatic DONE signal, and set the timing so it doesn't reset?

2. Is this the most appropriate part number? 

My goal is to keep the current draw as little as possible.

I went to this link and read the description of the breadboard using the TPL5110. Its claiming the TPL5110 is using 20uA, however the specs shows 35nA. Why the difference?

www.adafruit.com/.../3435

Ron answered the TPL5110 does use more current at power up to test the timing setting resistor, this is a one and done current.

Although 20uA will be fine but if it can be designed for less would be much better.

Thanks,

Allan

Thank you,  

1. Is there a schematic drawing example of the one shot?

2. Im not sure if the TPL5110 is going to achieve what im trying to accomplish.  

I am controling the power going to a transmitter using a vibration switch. The transmitter usually last about 2 years being constantly on. It is powered by a 3v 220mah battery. 

When this circuit is physically stationary it will turn power off to the transmitter after 8 seconds.

As soon as the circuit is physically moved it will instantly turn the power on.

I have used an LMC555CTP. It is rated at 130uA @ 1.5v and 180uA @5v. The battery lasted approximately 60 days. I need it to last at least a year or 600 plus days.

3. You mentioned the timer can draw up to 400uA during the resistance period. Im concerned it will wear down the battery. 

A. Does this current draw depend on, the current draw of the circuit it will power?

B. This (power on/off) circuit always has to be ready to power the transmitter when motion is detected. Im not turning off anything (ex. a microcontroller). When would the TPL5110 be drawing 35nA, and when would it be drawing up to 400uA in this process? And how to calculate an average. 

C. Will this chip work, or is there a better chip?

Thanks

Lastly if I change the 8 second delay  to lets say 1 minute, so the circuit is powering the transmitter for a minute after it is stationary instead of 8 seconds will the circuit use more or less current? 

Allan,

Noel is currently out of office - please expect a response tomorrow.

Thanks,
Kadeem

Thanks for letting me know

Thank you for your response, I apologize but I can't read the table on the bottom it's very blurry. Can you resend just the table?

I am still not clear on the 400uA what it depends on, how long it will be drawing that amount and if it can be reduced.

How long can I expect a 3v 220mah battery to last.

Thanks

Allan,

If the battery is always connected, then the '400uA' only happens once. So AH is 400uA * t_REXT, an insignificant value.

Try clicking on the images, they open up as high resolution.

So as soon as the battery is connected to the circuit thats the only time it draws 400uA until the battery is disconnected. The rest of time its only going to draws 35nA plus the transmitter. Thats really great news. I was able to clearly see the table by clicking on the image. 

Thank you so much!

We have ordered the TPL5110 and will be testing.

Can we keep the case open until we have successful design,  just in case I need more help?

Thank you again. 

Best Regards, 

Allan 

Allan,

You can reply again at anytime to get more help. In farther future the thread may be closed, in that case just click 'ask related question' to pick up exactly where we left off.

• Thanks, Will I be able to log in and see the all threads if the case is closed as usual? Also how can I share this thread. I apologize this is first time on a thread, and i am not clear on making posts as you can see.