Jim Paris <jim@jtan.com>
This level-shifting serial adapter for the PSP (and other devices) is based on the MAX3319E interface chip. This chip provides guaranteed 460kbps RS-232 compatible operation with a supply as low as +2.25V, making it a perfect choice for the +2.5V supply and logic interface on the PSP.
The board supports either a male or female DB9 connector in a DTE or DCE configuration, selectable with solder jumpers during assembly. Typically, to avoid the need for adapters and “null-modem” cables, female/DCE is used to connect the PSP to a PC, while male/DTE is used to connect the PSP to other devices like a GPS.
It was designed to fit comfortably inside a DB9 plastic hood. Four holes with 2.54mm spacing provide the power and data connections to the PSP.
| Label | Description | PSP Pin |
|---|---|---|
| V | Supply voltage, +2.25V to +3.0V | 5, +2.5V |
| G | Ground | 2, Digital ground |
| IN | Serial input to the adapter | 3, TXD |
| OUT | Serial output from the adapter | 6, RXD |
A small number of these adapters are for sale. Please note that I haven't found a good source for the PSP cable, and so these are being sold with everything except the cable, as shown below.
The complete kit contains
Before you order, it's best to send me a mail to verify I have enough parts left.
The cost is US $8 per adapter, and shipping is US $5 per order (USPS Priority Mail or USPS Global Priority Mail). Specify male or female for the DB9 connector. Send money and a shipping address via PayPal to jim@jtan.com.
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