Mic ETS2228 Instrukcja Użytkownika Pobierz pdf (Strona 8)

ETS2228 Maintenance Manual

Signal Modules Function Description

VREG_PHONE the secondary power conversion module the output of the secondary

power:4.44V

V_BATT

Battery－>PM6610

the battery output voltage

CHG_EN PM6610->TL494 PM6610:control the output

List 1 Battery Charging/Discharging Module Signals

Figure 3 Battery charging Circuit

Battery is connected to the output of the secondary power supply(4.4V) directly. When there is no

external power supply, battery powers the system supply through the signal VREG_PHONE, and there is

no special discharging control circuit.

 Audio Interface Circuit

ETS2228 audio interface includes handle receiver (the microphone and earphone is included),

speaker interface and hands-free MIC interface. The power of speaker is quit bigger than the others,

which must be amplified through the audio amplifier, but for hands-free MIC interface and handle

receiver can be connected directly.

1）Handset MIC Interface。Bead and capacitor constitute the filter circuit.

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Mic ETS2228 Instrukcja Użytkownika Strona 8