AT21CS01
Overview
- Low‑Voltage Operation: - AT21CS01 is self-powered via the 1.7V to 3.6V pull‑up voltage on the SI/O line - AT21CS11 is self-powered via the 2.7V to 4.5V pull‑up voltage on the SI/O line
- Internally Organized as 128 x 8 (1 Kbit)
- Industrial Temperature Range: -40°C to +85°C
- 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: - 15.4 kbps maximum bit rate in Standard Speed mode (AT21CS01 only) - 125 kbps maximum bit rate in High-Speed mode (AT21CS01 and AT21CS11)
- 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 eight bytes contain a factory-programmed, read-only, 64‑bit serial number that is unique to all Microchip single‑wire devices - Next eight bytes are reserved for future use and will read FFh - Upper 16 bytes are user‑programmable and permanently lockable
- Self‑Timed Write Cycle: 5 ms Maximum
