SPI flash for sensor data logging
The AT45DB041E-SHN-T is a 4Mbit non-volatile FLASH memory from Renesas, organized as 264 bytes x 2048 pages, communicating over an SPI bus at up to 85 MHz. It operates from a single 1.65V to 3.6V supply, meaning it can sit directly on a 1.8V sensor bus without a level translator, and its 8-SOIC footprint fits compact sensor module PCBs.
Write-cycle timing and throughput
Page write time is 3 ms typical, with a byte/word write of 8 µs — fast enough for streaming sensor samples in burst-capture applications. At 85 MHz SPI clock, the sustained read throughput is sufficient for code shadowing or data retrieval without stalling the host controller.