Published by: Hardware Engineering Desk
Reading Time: 6 minutes
The verified datasheet includes two critical application notes that are missing from unverified copies.
Commonly observed pins on LQFP-48:
| Pin | Name | Function | |-----|------|-----------| | 1 | VDD | 3.3V digital | | 2 | LAD0 | LPC address/data 0 | | 3 | LAD1 | LPC address/data 1 | | 4 | LAD2 | LPC address/data 2 | | 5 | LAD3 | LPC address/data 3 | | 6 | LFRAME# | LPC frame | | 7 | SERIRQ | Serial IRQ | | 8 | CLK24M | 24 MHz oscillator in | | 9 | VSS | Ground | | 10 | KSO0 | Keyboard scan out 0 | | ... | ... | ... | | 40–45 | GPIO/ADC | General purpose / analog inputs | | 46–48 | VDD, VSS, RST# | Power and reset | wpce773la0dg datasheet pdf verified
⚠️ Do not rely on these pin numbers without the verified datasheet. Always match against official Nuvoton document.
Manufacturer Website: The first step is to try and identify the manufacturer. A web search with the part number can often lead you directly to the manufacturer's website or distributors that have detailed information about the component.
Distributor Websites: Electronic component distributors like Digi-Key, Mouser, or Newark often have extensive datasheets and product information. If you enter the part number on their websites, you might find detailed specs, datasheets, and even samples or purchasing options. No power: Corrupted EC firmware (needs reflash) or failed 3
Google Search: Performing a Google search with the part number along with "datasheet" or "pdf" can lead to direct links to datasheets. For example, searching for "wpce773la0dg datasheet" or "wpce773la0dg pdf".
Component Databases: Websites like Octopart or Findchips can also be useful. They aggregate information from various distributors and manufacturers, making it easier to find datasheets and compare prices.
Answer (from Mechanical Drawing, page 108): Pin #1 is indicated by a chamfered edge on the top-left corner of the package, next to a laser-marked dot. On the PCB, Pin #1 is at the corner nearest to the inductor (usually L5 or L6 on laptop boards). Download the verified PDF from Mouser
Section 6.2.1 confirms that on the LPC_AD lines (pins 92-95), external 10kΩ pull-up resistors to 3.3V are mandatory for stable host communication. Without these, the EC will randomly fail to boot.
| Parameter | Min | Typ | Max | Unit | |-----------|-----|-----|-----|------| | VDD supply | 3.0 | 3.3 | 3.6 | V | | Input low voltage (VIH) | 2.0 | – | VDD+0.3 | V | | Input low voltage (VIL) | -0.3 | – | 0.8 | V | | Output sink current (IOL) | – | 8 | 12 | mA | | ADC reference | – | 3.3 | – | V | | Operating temp (commercial) | 0 | – | 70 | °C |
The WPCE773LA0DG is a powerful but aging embedded controller. Whether you are reverse-engineering a classic motherboard or repairing a legacy industrial PC, using an unverified datasheet will lead to misdiagnosed power rails, wrong pin configurations, and wasted hours.
Your action plan:
Final Verified Link Status: The WPCE773LA0DG datasheet PDF is confirmed active and available for free distribution from authorized semiconductor archives as of this writing.