What if the built-in 320KB space of KT142C voice chip is insufficient? Are there alternative solutions available?

The KT142C voice chip has a built-in storage capacity of 320KB. For details, please refer to Section 4.3 of the chip manual as shown in the diagram below.

Here's a detailed explanation of why it's 320KB:

The KT142C chip actually contains 512KB of internal space, which is allocated as follows:

A portion is used to store program firmware

Another portion serves as memory storage space

The remaining space is what users can freely utilize for voice storage

→ No additional space can be freed up

If the 320KB capacity doesn't meet your requirements, the only option is to adopt an external flash solution, where the available space depends entirely on the capacity of the external flash chip.

Advantages:

Storage capacity can be freely expanded

Disadvantages:

Requires an additional flash chip

Increases BOM cost

→ That's the only drawback

For more details, please review the "KT142F" chip solution.