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PCINT13 Datasheet(PDF) 191 Page - ATMEL Corporation

Part # PCINT13
Description  High Performance, Low Power Atmel AVR 8-bit Microcontroller Advanced RISC Architecture
PDF  294 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

PCINT13 Datasheet(HTML) 191 Page - ATMEL Corporation

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191
9219A–RFID–01/11
Atmel ATA5505 [Preliminary]
16. Reader/Writer Front End
16.1
Power Supply (PS)
Figure 16-1. Equivalent Circuit of Power Supply and Antenna Driver
The reader front end can be operated with one external supply voltage or with two exter-
nally-stabilized supply volt-ages for extended driver output voltage or be operated from 12V
vehicle battery voltage. The 12V supply capability is achieved via the on-chip power supply
(see Figure 16-1). The power supply provides two different output voltages, V
S and VEXT.
V
S is the internal power supply voltage for everything except the driver circuit. Pin VS is used
to connect a block capacitor. V
S can be switched off via the STANDBY pin. In standby mode,
the reader front end’s power consumption is very low. V
EXT is the supply voltage of the
antenna’s pre-driver. This voltage can also be used to operate external circuits. In conjunction
with an external NPN transistor, it also establishes the supply voltage of the antenna coil
driver, DV
S.
Power supply
DV
S
V
EXT
Frequency
adjustment
&
&
Schmitt trigger
Frontend
Standby
MS
CFE
OE
Output
RF
Control (0 to 3)
DGND
Input
COIL2
COIL1
Oscillator
= 1
Lowpass filter
HIPASS
V
S
V
Batt
Driver



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