VL53L1X - i2c consumption

[Alskandar]

Hello,

How do I deactivate/activate a SDA/SCL line?

I perform a test on an Icarus board with a VL53L1X sensor, everything works fine.
However, in idle/sleep mode, whether I turn off the sensor or not (by XSHUT, GPIO or physically), it consumes an additional 10uA. 
Even without code to initialize the sensor, and only plugging in the SDA & SCL ports, I have a 10uA boost. 
I don't understand where this is coming from or how to fix it. 

Does someone have an idea ?

Thanks !

[ivnn]

Hi,
try to configure gpio pins to tri-state, which could be done with nrf_gpio_cfg_default(pin)

[Alskandar]

Hi,
I'm with an nRF9160.
I tried like this, without success.

That is to say that the ports are at 0V but no reduction in consumption. 
Worse when I reactivate the port, it rises above 1.5mA.

pins_vl53L1X = device_get_binding("GPIO_0");
gpio_pin_configure(pins_vl53L1X, 26, GPIO_OUTPUT);
gpio_pin_configure(pins_vl53L1X, 27, GPIO_OUTPUT);
gpio_pin_set(pins_vl53L1X, 26, 0);
gpio_pin_set(pins_vl53L1X, 27, 0);

[Øyvind]

Hello, 

Looking at the datasheet of the sensor itself, it looks like the sensor has a leakage current of 10µA when AVDD is 0V. How are you measuring the current consumption?

Kind regards,
Øyvind

[Alskandar]

Hi,

Yes i saw it too but i don't know how to use this information.

Should i mount an auxiliary system with a resistor to block state ?

For current measurement, i use an Otii Arc (on Vbat & GND with Icarus Board) (like SMU mode with nRF9160-DK).

Thanks

[ivnn]

Pls, provide a simplified schematic of your setup this might help us to guide you

[Alskandar]

Here is the diagram of Icarus board with VL53L1X sensor (connected in i2c on 26 & 27, 3V3 & GND).

Without sensor connected, i have a consumption near 33uA

With sensor connected, all connected (GND, 3V3 & i2c) or even with just i2c (without 3V3 & GND), i have a consumption near 45uA

[ivnn]

Onboard, FTDI UART Bridge could take this current. Try to add power directly to 3.3V pin

[Alskandar]

The Otii Arc power the board in 3.6V (on Vbat) at the same times it takes the measurement.
For UART, in my prj.conf i make CONGIG_SERIAL=n, same for spm.conf.
Otherwise the consumption increases by 600uA.

[ivnn]

I meant you should desolder it

[mike_actinius]

Hi Alskandar,

Are you using the VL53L1X with a breakout board? If so, which one and what is on it?

PS the FTDI is completely unrelated to this and it anyway does not draw any current when the USB is unconnected. You schematic Alskandar seems fine and VBAT is indeed the right pin to connect the Otii.

BR,

Mike