MB85RC256V I2C FRAM breakout (32 KB) with ESP32

Supply 3.3-5 V Bus I2C I2C address 0x50 / 0x51 / 0x52 / 0x53 / 0x54 / 0x55 / 0x56 / 0x57

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
VCC	Power	3V3
GND	Ground	GND
WP	Not wired to the ESP32	—	Write protect: LOW (default) allows writing
SCL	I2C clock (SCL)	D22
SDA	I2C data (SDA)	D21
A2	Not wired to the ESP32	—	Address bit, pulled LOW
A1	Not wired to the ESP32	—
A0	Not wired to the ESP32	—

Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.

Starter code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);  // SDA = GPIO 21, SCL = GPIO 22
  Wire.beginTransmission(0x50);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "MB85RC256V I2C FRAM breakout (32 KB) found at 0x50" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Sources

Fujitsu MB85RC256V datasheet, Device address 1010 A2 A1 A0 (0x50 to 0x57); supply 2.7 to 5.5 V; 10^12 write cycles
Adafruit I2C FRAM breakout guide, Pinouts. Order differs between boards: check the silkscreen

Try it in 3D in BoardPilot

BoardPilot Part data (JSON)

Part data: CC BY 4.0, free to reuse with credit to BoardPilot.

MB85RC256V I2C FRAM breakout (32 KB) with ESP32

Pins and ESP32 wiring

Starter code (Arduino)

Sources

Try it in 3D in BoardPilot

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