AT21CS01
Description
The Atmel® AT21CS01 provides 1,024 bits of Serial Electrically Erasable and Programmable Read-Only Memory (EEPROM) organized as 128 words of 8 bits each. The device’s software addressing scheme allows up to eight devices to share a common Single-Wire bus.
Key Features
- Low voltage operation ̶ Device is self-powered via 1.7V to 3.6V pull-up voltage on the SI/O line
- Internally organized as 128 words of 8 bits each (1-Kbit)
- Single-Wire serial interface with I2C protocol structure ̶ Device communication is achieved through a single I/O pin
- Standard Speed and High Speed Mode options ̶ 15.4kbps maximum bit rate in Standard Speed Mode ̶ 125kbps maximum bit rate in High Speed Mode
- 8-byte Page Write or single Byte Writes allowed
- Discovery Response feature for quick detection of devices on the bus
- ROM Zone support ̶ Device is segmented into four 256-bit zones, each of which can be permanently made read-only (ROM)
- 256-bit Security Register ̶ Lower 8 bytes contains a factory programmed, read-only, 64-bit Serial Number that is unique to all Atmel Single-Wire products ̶ Upper 16 bytes are user-programmable and permanently lockable
- Self-timed write cycle (5ms max)
- Manufacturer Identification support ̶ Device responds with unique value for Atmel as well as density and revision information
