U2270B-MFP Atmel, U2270B-MFP Datasheet - Page 4

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

Specifications of U2270B-MFP

• 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: Contains lead / RoHS non-compliant

3. Functional Description
3.1
4
Power Supply (PS)
U2270B
Figure 3-1.
The U2270B can be operated with one external supply voltage or with two externally-stabilized
supply voltages for an extended driver output voltage or from the 12V battery voltage of a vehi-
cle. The 12V supply capability is achieved via the on-chip power supply (see
power supply provides two different output voltages, V
V
to connect a block capacitor. V
chip’s power consumption is very low. V
This voltage can also be used to operate external circuits, such as a microcontroller. In conjunc-
tion with an external NPN transistor, it also establishes the supply voltage of the antenna coil
driver, DVS.
S
is the internal power supply voltage for everything except for the driver circuit. Pin VS is used
COILx
Equivalent Circuit of Power Supply and Antenna Driver
DGND
DV
S
V
EXT
DRV
S
9V
can be switched off by the STANDBY pin. In standby mode, the
Internal supply
EXT
6V
is the supply voltage of the antenna’s pre-driver.
V
S
PS
V
S
Batt
and V
6V
EXT
18V
.
Standby
Figure
4684E–RFID–02/08
25 k
12 k
3-1). The