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Power consumption of Anarduino grows after FTDI adapter disconnected  XML
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Joined: 19/10/2015 17:21:10
Messages: 32


I'm using Anarduino MiniWireless with LoRa module - http://www.anarduino.com/miniwireless/#

Anarduino powered from LiPo battery 4.2V to GND and Vin pins directly, also in this chain there is multimeter for measuring power consumption.

Also I've desoldered 10K pullup resistor as stetd here: http://forum.anarduino.com/posts/list/39.page#238 (is it really important for LoRa modules?)

Also Anarduino connected to FTDI-USB adapter, but without "Vcc" pin (only GND, CTS, TX, RX and DTR)
FTDI adapter connected to USB in my laptop and I can load program to Anarduino.

laptop -> USB -> FTDI(w/o Vcc) -> MCU[Anarduino] <- (A) -battery

Everything works ok.

I'm using this test code:

Code makes device sleep and this is my main goal - get the lowest power consumption in sleep mode.

Also this code works ok and my multimeter shows about 40uA of power consumption.
But if I disconnect FTDI adapter from Anarduino:

MCU[Anarduino] <- (A) -battery

- power consumption grows to 0.11mA! It is really not good for my device..

Note - all the digital and analog pins on Anarduino are disconnected and just floats so there no any reason to drain power.

I just don't understand - a lot of people say that they managed to get small power consumption around ~16uA but seems it just means that they measure power with FTDI adapter connected to USB?
I think this is useless.
We need such power consumption on battery powered variant.
I can't believe it.. there are a lot ? reports about devices that powered even from CR2032 and they work for years. How they work?

So I don't know what can I do next.
I just wonder if I'm only one who faced with this issue..
Because all who used these MCU have to disconnect Serial adapter from its device in usual mode. And as I see - it should lead to unexpectedly high energy consumption.
So why no one complains like me ?

This message was edited 1 time. Last update was at 24/05/2016 12:06:13


Joined: 19/10/2015 17:21:10
Messages: 32


There is a jumper on FTDI adapter - it switches power from 5v to 3v.
I've switched it to 3V mode and Anarduino started consume 0.11mA in sleep mode _with_ and _without_ FTDI adapter connected.

So now at least I know that Anarduino LoRa minimum power consumption is 0.11mA or 110uA.

Is there somebody who got lower values?
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