Microchip 25LC256 256 Kbit (32 KB) SPI serial EEPROM in PDIP-8 package, operating from 2.5–5.5V. SPI modes 0,0 and 1,1; 64-byte page write buffer; 1 million write cycle endurance. 25AA256 is the lower-voltage variant (1.8V).
Supply voltage 2.5–5.5 V; connect to 3.3 V rail
Ground
Chip Select (active LOW); connect to dedicated GPIO CS pin
SPI clock from Pico SPI peripheral
SPI data in (SI on device); connect to Pico MOSI
SPI data out (SO on device); connect to Pico MISO
Write Protect (active LOW); tie HIGH to VCC to allow writes
Hold (active LOW); tie HIGH to VCC for normal operation
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VCC | Power | Supply voltage 2.5–5.5 V; connect to 3.3 V rail | 3.3 |
| VSS | Ground | Ground | |
| CS | SPI | Chip Select (active LOW); connect to dedicated GPIO CS pin | |
| SCK | SPI | SPI clock from Pico SPI peripheral | |
| MOSI | SPI | SPI data in (SI on device); connect to Pico MOSI | |
| MISO | SPI | SPI data out (SO on device); connect to Pico MISO | |
| WP | GPIO | Write Protect (active LOW); tie HIGH to VCC to allow writes | 3.3 |
| HOLD | GPIO | Hold (active LOW); tie HIGH to VCC for normal operation | 3.3 |
Supply voltage 2.5–5.5 V; connect to 3.3 V rail
Ground
Chip Select (active LOW); connect to dedicated GPIO CS pin
SPI clock from Pico SPI peripheral
SPI data in (SI on device); connect to Pico MOSI
SPI data out (SO on device); connect to Pico MISO
Write Protect (active LOW); tie HIGH to VCC to allow writes
Hold (active LOW); tie HIGH to VCC for normal operation
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