# EM4055: 1KBIT Read/Write Contactless Identification Device

## Device Description

· CMOS integrated circuit for passive read/write RF-transponders (125kHz).
· 1kbit EEPROM:
- User-defined Read memory area for default output.
- User-defined Write protected words.
- User-defined Read protected words.
· 32-bit password for write and read protection (password is updatable but not readable).
· Fixed code anticollision ID and device identification (programmed and locked).
· Configurable start-up modes: Quiet or Standard read.
· Data transmission via amplitude modulation (ASK).

## Applications

· Ticketing
· Access control
· Inventory Control
· Prepayment devices

· Manufacturing automation
· Industrial logistics

## Features

· 1kbit EEPROM (32 words x 32 bits)
· Power-check before EEPROM Write
· 32-bit WORM anticollision ID
· 32-bit WORM device identification
· Fast Anticollision Protocol
· Tag entry detection
· User-selectable data rates: RF/64 or RF/32
· 100kHz to 150kHz field frequency range
· On-chip rectifier and voltage limitation
· On-chip supply buffer capacitor
· Power-on Reset
· Operating Temperature: -40°C to +85°C
· Requires external coil (4.9mH) and capacitor (330pF)