3. TECHNICAL BRIEF
- 38 -
Cradle Charge Current
The cradle charge current is enabled by the EN pin only, the USBON pin has no control on the cradle
charge current. The cradle charge current is programmed with the external resistor connected
between the ICDL pin and the GND pin. The current can be calculated with one of the equations given
in the ICDL pin description. Two equations are used for the cradle current calculation, each
corresponds to a different range of currents. The typical rDS(ON) of the P-channel MOSFET for the
CRDL input is 600mΩ at room temperature. When the head room between the input and output
voltages is small, the actual charge current, similar to the USB case, could be limited by the rDS(ON).
On the other hand, if the head room between the input and output voltages is large, the charge current
may be limited by the thermal foldback threshold.
Floating Charge Voltage
The floating voltage during the constant voltage phase is 4.2V. The floating voltage has an 1%
accuracy over the ambient temperature range of -40˚C to 70˚C.
Figure 3-17. BLOCKDIAGRAM
Содержание KG320
Страница 1: ...Date May 2006 Issue 1 0 Service Manual Model KG320 Service Manual KG320 ...
Страница 3: ... 4 ...
Страница 20: ...3 TECHNICAL BRIEF 21 Figure 3 5 SKY77328 FUNCTIONAL BLOCK DIAGRAM ...
Страница 39: ...3 TECHNICAL BRIEF 40 3 7 CAMERA IC AIT811T U103 Figure 3 18 AIT811T APPLICATION BLOCKDIAGRAM ...
Страница 41: ...3 TECHNICAL BRIEF 42 3 8 MIDI IC YMU787 U202 Figure 3 20 YMU787 BLOCKDIAGRAM ...
Страница 59: ...4 2 TX Trouble 4 TROUBLE SHOOTING 60 SKY7477328 FEM 26Mhz OSCILLATOR SI4210 TEST POINT Figure 4 2 ...
Страница 72: ...4 TROUBLE SHOOTING 73 4 6 LCD Trouble AIT811T EMI FILTER CN102 TEST POINT Figure 4 6 ...
Страница 77: ...4 TROUBLE SHOOTING 78 Graph 4 10 a BLUE RST Graph 4 10 b DEBUG_TX RX Graph 4 10 c PCM_SYNCS TX RX USC0 ...
Страница 90: ...4 TROUBLE SHOOTING 91 4 14 Camera and Flash Trouble Camera Module U201 CN202 Figure 4 17 ...
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Страница 107: ... 108 8 PCB LAYOUT ...
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Страница 121: ...10 STAND ALONE TEST 122 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
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Страница 147: ...Note ...
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