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U227B Scheda tecnica(PDF) 6 Page - ATMEL Corporation

Il numero della parte U227B
Spiegazioni elettronici  Carrier Frequency fosc 100 kHz to 150 kHz
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

U227B Scheda tecnica(HTML) 6 Page - ATMEL Corporation

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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 k
[]
14375
f
0 kHz
[]
---------------------
5
=
R
F
R
f
V
S
2 k


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