2 Description

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 designed to enhance configuration and usage information in unpowered attachments through a two-point mechanical connection that brings a single 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 aftermarket 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).