EM4305 Key Card
    512 bit Read/Write Contactless Identification Device-The EM4305 key card is a CMOS integrated circuit intended for use in electronic Read/Write RF transponders.

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    EM4305 Key Card

    1. Chip: EM4305
    2. Dimension: CR80
    3. Frequency: 125KHz
    4. Standard ISO11785
    5. Material: PVC or ABS
    6. Data saved time: 10 years
    7. Options: Signature panel, LOCO/HICO Magnetic Stripe, embossing letter and number, barcode, sequential numbering, Gold/Silver card, frosted card.
    8. Application: EM4305 Key Card is widely used in Parking lot system and hotel door locks, for its long inductive distance(70-80cm), ISO Thin EM Card is widely used in Access Control System, Time and attendance,parking lot and consuming system.


    -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°C to +85°C temperature range
    -Very low power consumption
    -Enlarged bumped pads (200 μm x 400 μm) for direct connection of coil (EM4305)
    -EM4305: 3 resonant capacitor versions 210pF, 250pF or 330pF selectable by mask

    It is suitable for low cost solutions like animal taggingapplications. The IC communication protocol is 
    compatible with EM4469/4569 family. In 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 EM4305 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.

    The IC is powered by picking the energy from a continuous 125 kHz magnetic field via an external coil, which together with the integrated capacitor form a resonant circuit. The IC read 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.
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