3

Atmel U3280M [DATASHEET]

4688E–RFID–05/13

2.

Pin Configuration

Figure 2-1. Pinning

1

2

3

4

5

6

7

8

Coil 2

Coil 1

NC

NC

NC

NC

NGAP

MOD

16

15

14

13

12

11

10

9

VBatt

VDD

SCL

NRST

SDA

VSS

NC

FC

Table 2-1.

Pin Description

Pin

Symbol

Function

1

VBatt

Power supply voltage input to connect a battery

2

VDD

Power supply voltage for the microcontroller and EEPROM. At this pin a buffer capacitor (0.5 to 10µF)

must be connected to buffer the voltage during field supply and to block the VDD of the microcontroller.

3

SCL

Serial clock line

4

NRST

Reset line bi-directional

5

SDA

Serial data line

6

VSS

Circuit ground

7

NC

Not connected

8

FC

Field clock output of the front-end clock extractor

9

MOD

Modulation input

10

NGAP

Gap and field detect output

11

NC

Not connected

12

NC

Not connected

13

NC

Not connected

14

NC

Not connected

15

Coil 1

Coil input 1. Use pin to connect a resonant circuitry for communication and field supply

16

Coil 2

Coil input 2. Use pin to connect a resonant circuitry for communication and field supply