The operating conditions are the physical parameters that the chip can operate within.

Table 1. Recommended operating conditions
Symbol Parameter Min. Nom. Max. Units
VBAT VDD supply voltage 2.9 3.6 4.5 V
IOVDD VDD supply voltage for IO pins 1.62 1.8 3.6 V
OTPVDD VDD supply voltage for OTP memory (read mode) 1.62 1.8 1.98 V
OTPVDD VDD supply voltage for OTP memory (write mode) 2.25 2.5 2.75 V
TA Operating temperature -40 25 85 °C

WLCSP light sensitivity

All WLCSP package variants are sensitive to visible and close-range infrared light. This means that a final product design must shield the chip properly, either by final product encapsulation or by shielding/coating of the WLCSP device.

The WLCSP package variant has a backside coating, where the marking side of the device is covered with a light absorbing film, while the side edges and the ball side of the device are still exposed and need to be protected.