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U227B Scheda tecnica(PDF) 6 Page - ATMEL Corporation |
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U227B Scheda tecnica(HTML) 6 Page - ATMEL Corporation |
6 / 18 page 6 4684E–RFID–02/08 U2270B Figure 3-4. Battery Operation 3.3 Oscillator (Osc) The frequency of the on-chip oscillator is controlled by a current fed into the R F input. An inte- grated compensation circuit ensures a wide temperature range and a supply-voltage– independent frequency which is selected by a fixed resistor between R F (pin 15) and VS (pin 14). For 125 kHz, a resistor value of 110 k Ω is defined. For other frequencies, use the following formula: This input can be used to adjust the frequency close to the resonance of the antenna. For more details see Section “Applications” on page 10. Figure 3-5. Equivalent Circuit of Pin R F V Batt Standby V S V EXT DV S 7V to 16V Table 3-1. Characteristics of the Various Operation Modes Operation Mode External Components Required Supply-voltage Range Driver Output Voltage Swing Standby Mode Available One-rail operation 1 voltage regulator 1 capacitor 5V ±10% ≈ 4V No Two-rail operation 2 voltage regulators 2 capacitors 5V ±10% 7V to 8V 6V to 7V No Battery-voltage operation 1 transistor 2 capacitors Optional, for load dump protection: 1 resistor 1 capacitor 6V to 16V ≈ 4V Yes R t kΩ [] 14375 f 0 kHz [] --------------------- 5 – = R F R f V S 2 k Ω |
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