The **M95010-R** is a specific variant of the 1-Kbit serial SPI Bus EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. Below is a detailed breakdown of its electronic specifications and characteristics. --- ## 1. Technical Specifications This table outlines the core electronic parameters of the M95010-R. | Feature | Specification | | :--- | :--- | | **Memory Size** | 1 Kbit (128 Bytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Operating Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Max Clock Frequency** | 20 MHz (at 4.5V - 5.5V) / 5 MHz (at 1.8V) | | **Page Size** | 16 Bytes | | **Write Cycles** | More than 4 Million cycles | | **Data Retention** | More than 200 Years | | **Operating Temperature** | -40°C to +85°C | --- ## 2. Pin Configuration and Functions The device typically comes in small packages like SO8 or TSSOP8. The functions of the pins are critical for its operation: | Pin Name | Description | Function | | :--- | :--- | :--- | | **S (Chip Select)** | Input | When low, the device is selected; when high, it is in standby. | | **D (Serial Data In)** | Input | Used to transfer data into the device. | | **Q (Serial Data Out)** | Output | Used to transfer data out of the device. | | **C (Serial Clock)** | Input | Provides the timing for data input and output. | | **W (Write Protect)** | Input | Used to freeze the status register to prevent writing. | | **HOLD** | Input | Used to pause communication without resetting the serial sequence. | | **Vcc / Vss** | Power | Supply voltage and Ground. | --- ## 3. Key Electronic Features ### A. Low Voltage Operation (The "-R" Suffix) The **-R** in the part number specifically denotes the voltage range. Unlike standard versions that might require 2.5V or 5V, the -R version is optimized for **1.8V to 5.5V**, making it ideal for battery-powered or low-power handheld electronics. ### B. High-Speed SPI Protocol It supports SPI modes (0,0) and (1,1). Data is latched on the rising edge of the clock (C) and shifted out on the falling edge. It is significantly faster than I2C-based EEPROMs. ### C. Write Protection Mechanisms To ensure data integrity, the M95010-R includes: * **WEL Bit:** A Write Enable Latch bit that must be set before any write instruction. * **Block Protection:** Hardware-defined areas of memory (none, quarter, half, or whole) can be protected via the Status Register. --- ## 4. Typical Application Circuit When integrating this part into a circuit, pull-up resistors are often used on the SPI lines, and a decoupling capacitor is required for the power supply. ```cpp // Example: Basic SPI Command structure for M95010 #define WREN 0x06 // Write Enable #define WRITE 0x02 // Write to Memory #define READ 0x03 // Read from Memory #define RDSR 0x05 // Read Status Register ```