PCINT13 datasheet(193/294 Pages) ATMEL

193 / 294 page

193

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

16.2.3

Car Battery-voltage Operation

In this operation mode V

S and VEXT are generated by the internal power supply, no external

voltage regulator is required. The IC can be switched off via the STANDBY pin. V

EXT provides

the reference voltage for the external NPN transistor. In case of external use of VEXT a nega-

tive impact to the reader performance by the load has to be considered.

Pin V

EXT and VBatt are overvoltage protected via internal Zener diodes (see Figure 16-1 on

page 191). The maximum current into the pins is determined by the IC’s maximum power dis-

sipation and maximum junction temperature.

Figure 16-4. Car Battery Operation

Batt

Standby

EXT

7V to 16V

Table 16-1.

Characteristics of the Various Operation Modes

Operation Mode

External Components Required

Supply-voltage Range

Driver Output

Voltage Swing

Standby Mode

Available

5V operation

1 voltage regulator

1 capacitor

5V ±10%

≈ 4V

Increased power operation

1 voltage regulator

2 capacitors

7V to 8V

6V to 7V

Yes

Car battery-voltage

operation

1 transistor

2 capacitors

Optional, for load dump protection:

1 resistor

1 capacitor

6V to 16V

≈ 4V

Yes

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