sparkfunx/qwiic_iridium_9603n

Iridium 9603N in Qwiic format (with I2C connectivity)

Qwiic Iridium 9603N

Iridium 9603N in Qwiic format (with I2C connectivity)

Qwiic Iridium 9603N (SPX-16394)

Repository Contents

• /Hardware - Eagle PCB, SCH and LBR design files
• /Firmware - Arduino code which comes pre-programmed onto the board
• LEARN.md contains a description of the Qwiic Iridium 9603N hardware
• LICENSE.md contains the licence information

Arduino Examples

You will find a complete set of Arduino Examples for the Qwiic Iridium 9603N built into the SparkFun IridiumSBD I2C Arduino Library. Look for the I2C_Examples__Qwiic_Iridium.

Acknowledgements

This project relies upon Spence Konde's ATTinyCore for the ATtiny841. Spence's work is gratefully acknowledged.

qwiic_iridium_9603n's Issues

3.3 V rail voltage drops during charging

Hi @PaulZC

I recently concluded a successful 11-day test of the Qwiic Iridium 9603N + MicroMod Data Logging Carrier Board + Artemis Processor. Temperatures in Canada were chilly again, dropping to -25°C, and it was a good opportunity to stress test the components in the cold.

I realized I had never measured the voltage of the 3.3 V rail when the Qwiic Iridium was powering up. I was surprised to see that when charging (@ 150 mA), the Qwiic Iridium hammers the 3.3 V bus, causing it to drop to 2.9 V. I observed the same behaviour when connected to both an MMDLCB (powered by a 3.7 V LiPo) and a Qwiic Micro (3.3 V rail powered by a SparkFun Buck-Boost).

Is this expected behaviour for the Qwiic Iridium 9603N? If so, do you anticipate this voltage drop would cause any issues for other devices on the I2C bus? 

Cheers,
Adam