U2270B-MFPG3 Atmel, U2270B-MFPG3 Datasheet - Page 9

• Manufacturer Part Number: U2270B-MFPG3
• Description: IC BASEREADER RFID 125KHZ 16SOIC
• Manufacturer: Atmel
• Series: U2270Br

Specifications of U2270B-MFPG3

• Rf Type: Read / Write
• Frequency: 125kHz
• Features: Read/Write Base Station
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.7
4684E–RFID–02/08
Driver (DRV)
The driver supplies the antenna coil with the appropriate energy. The circuit consists of two inde-
pendent output stages. These output stages can be operated in two different modes. In common
mode, the outputs of the stages are in phase; in this mode, the outputs can be interconnected to
achieve a high-current output capability. Using the differential mode, the output voltages are in
anti-phase; thus, the antenna coil is driven with a higher voltage. For a specific magnetic field,
the antenna coil impedance is higher for the differential mode. As a higher coil impedance
results in better system sensitivity, the differential mode should be preferred.
The CFE input is intended to be used for writing data into a read/write or a crypto transponder.
This is achieved by interrupting the RF field with short gaps. The various functions are controlled
by the inputs MS and CFE (see
is shown in
Figure 3-9.
Figure 3-10. Equivalent Circuit of Pin CFE
Figure 3-1 on page
Equivalent Circuit of Pin MS
4.
“Function Table” on page
CFE
MS
30 µA
30 µA
10). The equivalent circuit of the driver
U2270B
9