32Kbit I2C EEPROM — parameter storage for industrial and mixed-voltage designs
The STMicroelectronics M24C32-RMN6TP is a 32Kbit serial EEPROM with an I²C interface, organized as 4K x 8 bits. It stores configuration data, calibration constants, serial numbers, and boot parameters in systems that need non-volatile retention without battery backup. The 1 MHz clock rate supports fast-mode plus I²C bus operation, and the 450 ns access time defines the random-read latency from the memory array to the serial output register — fast enough for most parameter-fetch sequences without stalling the host controller.
The 450 ns access time is the random-read latency from the address latch to the first data bit appearing on the serial output. At a 1 MHz I²C clock (1 µs period), this latency consumes less than half a clock cycle — the bus master does not need to insert wait states or stretch the clock for read operations. For sequential reads, the access time only applies to the first byte; subsequent bytes stream at the full 1 MHz rate. This matters most when the host reads a calibration table or boot vector at power-up, where every microsecond of latency adds to system start time.
Active lifecycle — no end-of-life tracking required
ROHS3 compliance is confirmed, covering the full set of RoHS exemptions including lead-free soldering compatibility. No special handling or legacy solder-profile adjustments are needed for reflow assembly.
5 ms write cycle — plan for page writes
The write cycle time is 5 ms for a page write (up to 16 bytes per page). Writing the full 32Kbit array one byte at a time would take over 20 seconds; using 16-byte page writes reduces that to roughly 1.3 seconds. For production programming, the firmware loader or test fixture should use page writes to keep programming time acceptable. The part does not support a write-in-progress status pin — the host must poll the I²C acknowledge after each write cycle to know when the next write can start.