U2270B-MFPG3Y Atmel, U2270B-MFPG3Y Datasheet - Page 5

• 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

3.2
3.2.1
3.2.2
3.2.3
4684E–RFID–02/08
Operation Modes to Power the U2270B
One-rail Operation
Two-rail Operation
Battery-voltage Operation
The following section explains the three different operation modes to power the U2270B.
All internal circuits are operated from one 5V power rail (see
and D
Figure 3-2.
In this application, the driver voltage, D
higher voltage than the rest of the circuitry to obtain a higher driver-output swing and thus a
higher magnetic field (see
ages can be as high as 8V. This operation mode is intended to be used in situations where an
extended communication distance is required.
Figure 3-3.
Using this operation mode, V
3-4 on page
switched off via the STANDBY pin. V
external circuits, like a microcontroller (even in standby mode).
Pin V
4).The maximum current into the pins is determined by the maximum power dissipation and the
maximum junction temperature of the IC.
EXT
VS
serve as inputs. V
and V
6). For this mode, an external voltage regulator is not needed. The IC can be
One-rail Operation Supply
Two-rail Operation Supply
Batt
are overvoltage protected via internal Zener diodes (see
DV
Batt
Figure
DV
S
S
is not used but should also be connected to that supply rail.
S
and V
V
EXT
V
3-3). V
EXT
+
EXT
V
EXT
S
V
are generated by the internal power supply (see
VS
S
S
supplies the base of an external NPN transistor and
is connected to a 5V supply, whereas the driver volt-
V
, and the pre-driver supply, V
Batt
V
Batt
+
Standby
Standby
+
7V to 8V (stabilized)
5V (stabilized)
+5V (stabilized)
Figure
3-2). In this case, V
EXT
Figure 3-1 on page
, are operated at a
U2270B
S
Figure
, V
EXT
5