VL53L4CX supply voltage and I2C voltage requirements

[ravi_v_teja]

Dear All,

I have a query regarding VL53L4CX voltage requirements. The data sheet mentions the typical voltage for AVDD is 2.8 and for IOVDD is 1.8V/2.8V

There is no separate IOVDD pin for VL53L4CX isn't it. So the I2C lines work with 1.8V MCU voltage also with AVDD and AVDDVCSEL at 3.3V? 

Thank you,

Ravi

[Peter BENSCH]

Welcome ​@ravi_v_teja, to the community!

correct, there is no separate IOVDD pin on the VL53L4CX.

The sensor’s I2C lines are open-drain, so a 1.8V MCU can be used as long as the SDA/SCL pull-ups are to 1.8V.

AVDD / AVDDVCSEL can be powered at 3.3V, which is within the recommended operating range.

Regards
/Peter

[ravi_v_teja]

Hello Peter,

Thank you for your response. I have another query on the XSHUT and GPIO1 (interrupt) voltage requirements.

The GPIO1 is open drain output so the same logic as I2C can apply and we can use for 1.8V.

How about for XSHUT,  can we use same 1.8V GPIO logic from MCU and the sensor recognises the correct state?

Regards,

Ravi

[Bin]

Hi:

Yes, XSHUT can be driven from a 1.8V MCU GPIO.

According to the VL53L4CX datasheet: Datasheet - VL53L4CX - Time-of-Flight sensor with extended range measurement

• XSHUT is a digital input, active low
• The recommended I/O voltage VIOV​IO​​ supports 1.8V / 2.8V
• The I/Os are internally failsafe, even though there is no separate IOVDD pin

So a 1.8V GPIO high level is supported for XSHUT.

Please also note:

1. XSHUT must not be left floating
2. A 10 kΩ pull-up is recommended if the host GPIO state is unknown during startup
3. XSHUT should only be driven high when AVDD is already present

So, in a 1.8V MCU + 3.3V AVDD/AVDDVCSEL system, using 1.8V logic for XSHUT is acceptable.

 

Best regards,

Bin FAN