Recommended operating conditions
The operating conditions are the physical parameters that the chip can operate within.
| Symbol | Parameter | Min. | Nom. | Max. | Units |
|---|---|---|---|---|---|
| VDD | VDD supply voltage, independent of DCDC enable | 1.7 | 3.0 | 3.6 | V |
| VDDPOR | VDD supply voltage needed during power-on reset | 1.75 | V | ||
| VDDH | VDDH supply voltage, independent of DCDC enable | 2.5 | 3.7 | 5.5 | V |
| VBUS | VBUS USB supply voltage | 4.35 | 5.0 | 5.5 | V |
| tR_VDD | Supply rise time (0 V to 1.7 V) | 60 | ms | ||
| tR_VDDH | Supply rise time (0 V to 3.7 V) | 100 | ms | ||
| TA | Operating temperature | -40 | 25 | 85 | °C |
| TJ | Junction temperature | 90 | °C |
Note: The on-chip power-on reset circuitry may not function properly for rise
times longer than the specified maximum.
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.
Some WLCSP package variants have 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. Other WLCSP package variants do not have any such protection.
The WLCSP package variant CKAA has a backside coating.