The EM4305 is a CMOS integrated circuit intended for use in electronic Read/Write RF transponders. It is suitable for low cost solutions like animal tagging applications. The IC communication protocol is compatible with EM4469/4569 family. In its EM4305 version, the circuit comes with enlarged pads and gold bumps for the two coil inputs. These pads are intended for direct
antenna connection without need of a module support. In addition to the other available resonnant capacitor values, the EM4305 is also available with 330pF.

The IC reads out data from its internal EEPROM and sends it out by switching on and off a resistive load in parallel to the coil using a large modulation index. Commands and EEPROM data updates can be executed by 100% AM modulation of the 125 kHz magnetic field.

The EM4205/4305 supports several Bi-phase and Manchester data encodings.
The operating modes are stored in the EEPROM configuration word. All EEPROM words can be write-protected by setting protection bits. The IC contains a factory programmed 32 bit UID number.

> 512 bit EEPROM organised in 16 words of 32 bit
> 32 bit unique identifier (UID)
> 32 bit Password read and write protection
> ISO 11784 / 11785 Standard Compliant
> Lock feature converts EEPROM words in Read Only
> Two data encodings: Manchester and Biphase
> Multi-purpose data rate: 8, 16, 32 and 64 RF clocks
> Reader Talk First feature
> Compatible with EM4469 communication protocol
> 100 to 150 kHz frequency range
> On-chip rectifier and voltage limiter
> No external supply buffer capacitor needed
> -40℃ to +85℃ temperature range
> Very low power consumption
> Enlarged bumped pads (200 μm x 400 μm) for direct connection of coil (EM4305)
> EM4205: 2 resonant capacitor versions 210pF or 250pF selectable by mask option
> EM4305: 3 resonant capacitor versions 210pF, 250pF or 330pF selectable by mask

Applications

Animal Identification according to ISO FDX-B
Pigeon races standard
Waste management standard (BDE)
Access Control