User Guide

WE866C6 Hardware Design Guide
1VV0301658 Rev. 1 Page 17 of 58 2020-06-16
4. POWER SUPPLY
The power supply circuitry and board layout are a very important part in the full product
design and they strongly reflect on the product overall performances, hence read carefully
the requirements and the guidelines that will follow for a proper design.
Power Supply Requirements
There are two power supply inputs to the module. The main power supply, connected to
VDD_3.3V input and the VDDIO input, each must fulfill the following requirements:
VDD_3.3V Input
Minimum
Maximum
Absolute Maximum Voltage
-0.3 V
3.65 V
Nominal Supply Voltage
3.3 V
-
Normal Operating Voltage Range
3.135 V
3.465 V
VDDIO Input
Minimum
Maximum
Absolute Maximum Voltage
-0.3 V
4.0 V
Nominal Supply Voltage
1.8V or 3.3V
-
Normal Operating Voltage Range
1.71 V
3.46 V
NOTE:
The Maximum Voltage MUST never be exceeded; care must be
taken when designing the application’s power supply section to avoid
having an excessive voltage drop.
If the voltage drop is exceeding the limits it could lead to degradation
of performance or cause a Power Off of the module.