[VL53L1x] VL53L1_ERROR_CONTROL_INTERFACE when VL53L1_GetMeasurementDataReady() called

[Trilys]

Hello,

I made a PCB with 7 VL53L1x, that I soldered by myself. I'm using the ST VL53L1 API.

6 of them are working great, but the # 7 return error -13 : VL53L1_ERROR_CONTROL_INTERFACE, referenced in vl53l1_errror_codes.h as :

 "/*!< error reported from IO functions */" 

Everything works until I start VL53L1_StartMeasurement() which returns no error.

After that, when I try to get any values, (with VL53L1_GetMeasurementDataReady(Dev1, &measure) for example) It returns error = -13.

I changed this sensor with a new one and still get the same error.

Do you have any idea to get this solved? Or to disable IO functions? I didn't find anything in the manual.

Thanks a lot,

Pierre

[Trilys]

Ok I know what was the problem.

When the supply is not correctly connected, I2C works but you can't make any measure.

Hope it will help.

[ToolV]

Hi Trilys,

you can validate your I2C Interface over 3 registers mentioned by L1 Datasheet, 4.2, p. 22. Which I2C Resistors are you using? Are there any other I2C devices on the same I2C bus?

Regards

[Trilys]

Hello,

It works for 1 or 2 minutes after a fresh reset, then send me this error.

I'm using 5.9kOhms pull-up (with power 3.3V) on SDA and SCL.

There is only VL53 on the same I2C bus.

I can change address, try to work with them, then after a delay, they send VL53L1_ERROR_CONTROL_INTERFACE.

Thanks for help

[ToolV]

Hi Trilys,

you mentioned that you have min. 7 Sensors " but the # 7 return error ". With 10 pF capacitance for each SDA IO Pin, L1 Datasheet, 4.1, Table 10, you will get 7*10 pF of parallel connected modules. Together with 5.9 kOhm Resistance it builds an lowpass so that you will get the rise time about 0.8473 * R * C = 350 ns. If there is no error in datasheet 4.1, Table 10, the maximal rise time tr < 120 ns. And if there is an error in datasheet, then the maximal tr in I2C specs is 300 ns. see UM10204, Table 10, p. 48 -> tr rise time for Fast-Mode (400k). In both cases the signal is to slow. I think you need different resistance depending on the number of modules.

Regards

[John E KVAM]

When the lasers turn on, the chip draws a lot more power (up to 20mA). So it could well be that everything works until you say 'start'.

It was a good catch. Well done.