Tool/software:
Hello,
We are currently using the DRV2625 and doing some current characterization and are noticing around 515uA of current in the VDD rail when it should be in Standby mode.
I am attaching the schematic for reference, but here are some quick notes:
- VDD is connected to a 4-4.2V rail called VSYS_HAPT.
- NRST is connected to a MCU GPIO
- TRIG/INTZ is intended to be used as an interrupt pin, therefore it is connected with a pullup to a 1.8V rail called DVDD_1V8_HAPT.
Here is the turn on sequence:
- Both rails are up
- NRST is held low by MCU, so turn NRST high -> At this stage I see 830 nA current consumption on DVDD_1V8 and 0A on VSYS_HAPT.
- At this moment, it seems that haptic driver is set at default to have TRIG/INTZ as trigger pin and in RTP mode. So the moment NRST goes high the motor starts vibrating.
- Then I write 0x49 to register 0x07 -> Change mode to 1 and trig_pin_func to 2
- This stops the vibration, but now I see 830nA on DVDD_1V8 and 515uA on VSYS.
I tried the following things:
- Once it goes in this state, changing the state of the NRST pin causes no changes on the current consumption on VSYS.
- I changed the pull up resistor to the recommended 2.2k in the datasheet, but that seems to make it worse to about 830uA.
- Isolated the TRIG/INTZ pin from the MCU, and still see the issue.
However I noted that, once I disconnected the pullup from 1V8, this unexpected current consumption goes away immediately and I measure 830 nA on DVDD_1V8 and 1.49 uA on VSYS, when NRST is high. When NRST is low it goes into shutdown mode as expected and see almost no current consumption.
We basically wanted to check whether we are missing a register write, or if there are power requirements we are missing.
Thank you in advance for your help!
Rei
