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3. TECHNICAL BRIEF
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3.10.3.3.2 Constant Current Charging
The PM6650 IC supports constant current charging of the main battery by controlling the charger pass
transistor and the battery transistor. The constant current charging continues until the battery reaches
its target voltage, 4.2V.
3.10.3.3.3 Constant Voltage Charging
Constant voltage charging begins when the battery voltage reaches a target voltage, 4.2V.
The end of constant voltage charging is commonly detected 10% of the full charging current (60mA)
• Charging Method : CC & CV (Constant Current & Constant Voltage)
• Maximum Charging Voltage : 4.2V
• Maximum Charging Current : 600mA
• Nominal Battery Capacity : 800 mAh
• Charger Voltage : 4.6V
• Charging time : Max 3.5h (Except time trickle charging)
• Full charge indication current (icon stop current) : 60mA
• Low battery POP UP : Idle - 3.38V, Dedicated(GSM/WCDMA) - 3.50V
• Low battery alarm interval : Idle - 3 min, Dedicated - 1min
• Cut-off voltage : 3.28V
Summary of Contents for U880
Page 1: ...Date November 2005 Issue 1 0 Service Manual Model U880 Service Manual U880 ...
Page 20: ...3 TECHNICAL BRIEF 21 ...
Page 32: ...3 TECHNICAL BRIEF 33 Figure 3 5 6 1 GSM PA functional block diagram ...
Page 35: ...3 TECHNICAL BRIEF 36 Figure 3 5 10 1 Bluetooth system architecture ...
Page 50: ...3 TECHNICAL BRIEF 51 Figure 3 10 3 2 1 PM6650 Functional Block Diagram ...
Page 114: ...4 TROUBLE SHOOTING 115 Loud Speaker U502 U503 Amp ...
Page 118: ...4 TROUBLE SHOOTING 119 C200 C201 for MIC serial capacitor ...
Page 121: ...4 TROUBLE SHOOTING 122 Q404 Q403 Q402 VBATT GND ...
Page 128: ...5 DOWNLOAD 129 5 Choose a Module Image file after clicking on the Browse button ...
Page 143: ...6 BLOCK DIAGRAM 144 6 3 Interface Diagram U880 Interface Diagram ...
Page 145: ... 146 ...
Page 154: ... 155 8 PCB LAYOUT ...
Page 155: ... 156 8 PCB LAYOUT ...
Page 156: ... 157 8 PCB LAYOUT ...
Page 157: ... 158 8 PCB LAYOUT ...
Page 158: ... 159 8 PCB LAYOUT ...
Page 159: ... 160 8 PCB LAYOUT ...
Page 166: ...9 CALIBRATION 167 Click START button U880 U880_ver1 1 U880 U880 Click U880 ...
Page 167: ... 168 ...
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Page 196: ...Note ...
Page 197: ...Note ...