HTTC AB01 Deep Sleep power consumtion deviate significantly

[ernst.schulz]

Hello,

normally these boards have a power consumption (DeepSleep) of 20µA But I have two boards that deviate significantly from this power consumption. One has 4 mA the other board has 8 mA.

The basis is the cubecell lorawan example program!

Class A
OTTA
ADR ON
Uplinkmode unconfirmed
Net_reservation off
AT-Support off
RGB deactive

Is there a hardware-problem?

Greetings

E_T

[shaffer]

CubeCell will automatically enter low power consumption mode after LoRaWAN is joined the network. Can you provide photos of your measurement of low power consumption?

[ernst.schulz]

Here a photo:

[ernst.schulz]

Here a photo, same software and test construction, but an other board:

The result: 17µA, what was expected!

Greeting

E_T

[shaffer]

Please compare the low-power normal and low-power abnormal development boards, and observe whether the low-power abnormal development boards have components dropped or poor welding. And you can provide photos of low-power abnormal development boards, and we can help you observe them.

[ernst.schulz]

The board actually had a soldering mistake that I fixed!
(Two Pins on IC CP2102)

Here the hole board:

E_T

[Sivaelid]

Hi what was the soldering error was it in manufacturing? As I have 2 board with similar issues. Simon

[shaffer]

Sorry, I didn’t see any problem from the picture, you can try this example, this example can more clearly observe the low power consumption. LowPower_WakeUpByTimer

[ernst.schulz]

Hi what was the soldering error was it in manufacturing?

Yes, the bridge between two pins was the delivery condition. However, removing the solder bridge did not solve the problem of high deepsleep current.

[ernst.schulz]

Yes, l also see now no soldering-problem!

[ernst.schulz]

I tested the board with the LowPower_WakeUpByTimer-Programm.

The current changes between 14,8 mA and 4,0 mA!

E_T

[shaffer]

Very sorry, our after-sales staff will contact you.

[weradus]

Hmm, never realized soldering mistakes, @shaffer can I have your feedback on this please.

[shaffer]

Very sorry, 1 and 2 are the welding points of the shielding cover, and 3 is the filter capacitor of the serial port chip. Can you solder the capacitor back? If it affects the use, please leave your email address and our after-sales staff will contact you.

[shaffer]

Forgot to add pictures

[ernst.schulz]

I wrote to the after-sales staff, but today there is no respose.

Now i have three boards with heavy deepsleep current counsumtion.

Greetings

E_T

[ksckung]

Power consumption in Sleep mode (Vbat /battery powered)

In HTCC-AB01,the typical value of Power consumption in Sleep mode is 11uA in spec. However, my measurement is different: Vbat Sleep mode Current (Vbat /battery powered) 3.5V 10.7uA 3.7V 10.9uA 4.0V 22.9uA 4.2V 27.1uA Which means it will almost triple Power consumption when li-ion fully charged. Is it normal? where the power was gone and how to reduce it? Also,I use a tweezer to short the charging IC input (Vs) to GND but the current does not change.

Maybe you can check the voltage on ADC and 3.3V pin.
If the ADC >2.4V
or
Power the device by Vbat 4.2V will case 3.3V go higher.
There should be some leakage due to IO pin overvoltage.