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Have you measured the voltage during connection? I'm using CR2032 and the voltage dips quite a lot. Maybe your battery (which one) has too high internal resistance and the voltage is too low. CySmart with BLE dongle uses very short connection interval thus causing high average current consumption.
Is this a custom board? You may need to add capacitance for surviving the current peaks during RX/TX. Here are some of my tests: https://www.eevblog.com/forum/projects/cr2032-battery-voltage-with-ble/
I'm not familiar with Keithley source/measure unit. Do you have a current limit that may kick in? Or too much resistance somewhere.
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Could you please verify what is the voltage at pin VDD/VDDR in the case of operating at coin cell battery? Also measure the current consumption by the application in this case.
That makes sense, thanks! Is there a way to extend the BLE dongle connection interval? The custom board loses connection after about 2 feet of distance.
I will look into adding capacitance!
Thanks! The voltage is a constant 3.3V when using a new coin cell battery. The current consumption peaks at about 16mA when connecting and decreases to about 13 - 15 mA when just transmitting.
You can change the dongle connection parameter by navigating to the cySmart App -> Configure Master Setting -> Connection parameters