Mobile Tech Co. Ltd 64MXFWBF110A Manuale Utente
10
3.4.
3.4.
3.4.
3.4. Power
Power
Power
Power supply
supply
supply
supply
The power supply must be able to provide sufficient current up to 2A.
For the VBAT input, a local bypass capacitor is recommended. A capacitor (above 100µF,
low ESR) is recommended. Multi-layer ceramic chip (MLCC) capacitors can provide the
best combination of low ESR and small size but may not be cost effective. A lower cost
choice may be a 100 µF tantalum capacitor (low ESR) with a small (1 µF to 10µF) ceramic
in parallel, which is illustrated as following figure. And the capacitors should put as closer
as possible to the MD251 VBAT (RF) pins. A voltage regulator diode should been add
between the Vbat and Gnd, and the BZV55C5V1 of Philips could been used. The following
figure is the recommended circuit.
low ESR) is recommended. Multi-layer ceramic chip (MLCC) capacitors can provide the
best combination of low ESR and small size but may not be cost effective. A lower cost
choice may be a 100 µF tantalum capacitor (low ESR) with a small (1 µF to 10µF) ceramic
in parallel, which is illustrated as following figure. And the capacitors should put as closer
as possible to the MD251 VBAT (RF) pins. A voltage regulator diode should been add
between the Vbat and Gnd, and the BZV55C5V1 of Philips could been used. The following
figure is the recommended circuit.
Figure
Figure
Figure
Figure 1
1
1
1：VBAT
VBAT
VBAT
VBAT input
input
input
input