U2270B-MFPG3Y Atmel, U2270B-MFPG3Y Datasheet - Page 10

• Manufacturer Part Number: U2270B-MFPG3Y
• Description: IC BASEREADER RFID 125KHZ 16SOIC
• Manufacturer: Atmel
• Series: U2270Br

Specifications of U2270B-MFPG3Y

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

3.8
4. Applications
10
Function Table
U2270B
To achieve the system performance, consider the power-supply environment and the mag-
netic-coupling situation.
The selection of the appropriate power-supply operation mode depends on the quality of supply
voltage. If an unregulated supply voltage in the range of V = 7V to 16V is available, the internal
power supply of the U2270B can be used. In this case, standby mode can be used and an exter-
nal low-current microcontroller can be supplied.
If a 5V supply rail is available, it can be used to power the U2270B. In this case, check that the
voltage is noise-free. An external power transistor is not necessary.
The application also depends on the magnetic-coupling situation. The coupling factor mainly
depends on the transmission distance and the antenna coils. The following table lists the appro-
priate application for a given coupling factor. The magnetic coupling factor can be determined
using Atmel
Table 4-1.
The maximum transmission distance is also influenced by the accuracy of the antenna’s reso-
nance. Therefore, the recommendations given above are proposals only. A good compromise
for the resonance accuracy of the antenna is a value in the range of f
details concerning the adequate application and the antenna design is provided in Section
“Antenna Design Hints”.
High
Low
High
High
CFE
Low
Low
OE
Magnetic Coupling Factor
®
’s test transponder coil.
Magnetic Coupling
k > 0.5%
k > 0.3%
k > 3%
k > 1%
Disabled
Enabled
Output
High
High
Low
Low
MS
STANDBY
COIL1
High
Low
High
Low
Appropriate Application
plus fine frequency tuning
plus frequency altering
Free-running oscillator
Diode feedback
Diode feedback
Diode feedback
res
= 125 kHz ± 3%. Further
Standby mode
U2270B
COIL2
Active
4684E–RFID–02/08
High
High