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U227B Arkusz danych(PDF) 5 Page - ATMEL Corporation

Numer części U227B
Szczegółowy opis  Carrier Frequency fosc 100 kHz to 150 kHz
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

U227B Arkusz danych(HTML) 5 Page - ATMEL Corporation

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


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