HTCC-AB02 unused pins - best practice?

vino2300 · October 10, 2021, 12:36pm

Hey fellas,

one quick question.
I’m using the CubeCell modules in my own PCB design with a battery. Therefore it is important to reduce the current as much as possible. I’ve noticed that the total current comsumption is floating in every single module between 6uA and 28uA. What is the best practice for unused pins? Should I connect them physically to GND or just leave them unconnected and set them as input with internal PU/PD?

sav59 · October 11, 2021, 4:29am

In the basic example, it is indicated that the GPIO needs to switch the pin to Analog mode

pinMode (GPIO, ANALOG);

github.com

HelTecAutomation/CubeCell-Arduino/blob/master/libraries/Basics/examples/Factory_Test/Factory_Test_AB02/Factory_Test_AB02.ino

#include "LoRaWan_APP.h"
#include "Arduino.h"
#include "HT_SH1107Wire.h"

/*
 * set LoraWan_RGB to 1,the RGB active
 * RGB red means sending;
 * RGB green means received done;
 */
#ifndef LoraWan_RGB
#define LoraWan_RGB 0
#endif

extern SH1107Wire  display; 

#define RF_FREQUENCY                                868000000 // Hz

#define TX_OUTPUT_POWER                             14        // dBm

#define LORA_BANDWIDTH                              0         // [0: 125 kHz,

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My CubeCell 1 / 2AA Node board consumes 3.5μA in sleep mode