Sleep Current Changed without no reason

Hi PM_Dialog,

Thanks for your reply. 6 boards are fully operational, except the current consumption. We double checked the IO resistance to GND. We found the resistance of one PWM output IO to GND became about200Ω. I think this is the reason for high current consumption. We use the PWM output IO to drive piezoceramic buzzer directly. Is there any problem for me to drive the buzzer?

Hi PM_Dialog,

We use a buzzer 20mm in diameter. I'm a little confused to PCD. The 30 devices are running same firmware and using components from the some batch. We probed the GPIO this morning using a oscilloscope. The PWM IO voltages of devices which work properly are around 3.38V. The voltages of devices with high sleep current are 3.1v or 2.0v.

Hi，PM_Dialog,

What we found was that the our boards worked well at first with 4uA in sleep mode, then some of them met high power consumption problem, and then we replaced the DA14585 component and all of them were fine again. We think there's something that causes the IO to be broken down. We don't know what type of output is. Open-drain or Push–pull?

Thanks,

Qinfei

Hi, PM_Dialog,

1. We want to know under what circumstances the IO pins will be broken down.

2. We found that "in output mode and analog mode the pull-up/down resistors are automatically disabled" from the datasheet. What is the driving capability of the output pins?

Thanks，

Qinfei

Hi, PM_Dialog,

我们回顾了the datasheet 3v3 repeatedly. Table 2: Absolute Maximum Ratings, Table 3: Recommended Operating Conditions, Table 11: Digital Input/Output - DC Characteristics, all of them only mention the voltage problem, and there is no mention of how much the output current can be as large. We wonder if it will be a particularly large current that has broken down the output pins.

Thanks,

Qinfei