MICROCHIP AT21CS01-STUM16-T

The AT21CS01/AT21CS11 is a two-pin memory (SI/O and Ground) that harvests energy from the SI/O pin to power the integrated circuit. It provides 1,024 bits of Serial Electrically Erasable and Programmable Read-Only Memory (EEPROM) organized as 128 words of eight bits each. The device is optimized to add configuration and use information in unpowered attachments using a two-point mechanical connection that brings only one signal (SI/O) and GND to the unpowered attachment. Some unpowered attachment application examples include analog sensor calibration data storage, ink and toner printer cartridge identification, and management of after‑market consumables. The device’s software addressing scheme allows up to eight devices to share a common single‑wire bus. The device is available in space‑saving package options and operates with an external pull‑up voltage from 1.7V to 3.6V on the SI/O line (AT21CS01) or from 2.7V to 4.5V on the SI/O line (AT21CS11).

• 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)
• Temperature Range:
  • Industrial (I): -40℃ to +85℃
  • Extended (E): -40℃ to +125℃
• 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
• Manufacturer Identification Register:
  • Device responds with unique value for Microchip as well as density and revision information
• High Reliability:
  • Endurance: 1,000,000 write cycles
  • Data retention: 100 years
  • IEC 61000-4-2 Level 4 ESD Compliant (±8 kV Contact, ±15 kV Air Discharge)
• Green (Lead-free/Halide-free/RoHS Compliant) Package Options
• Die Sale Options: Wafer Form and Tape and Reel
• Automotive AEC-Q100 Qualified