3. TECHNICAL BRIEF
- 43 -
3.7 Battery Charging Block
The ISL6299 is designed for a single-cell Li-ion or Li-polymer battery charging circuit that accepts both
a USB port and a desktop cradle as its power source.
Input Auto Selection
When both input sources are present, the charger selects only one power source to charge the
battery. When the CRDL input is higher than the POR threshold, CRDL is selected as the power
source. Otherwise the USB input is selected. If the CRDL input voltage is below the battery voltage but
the USB input voltage is higher than the battery voltage, then the USB input is used to charge the
battery. The control circuit always cuts both internal power devices off before switching from one
power source to the other to avoid a cross conduction of both power MOSFETs.
(GPIO_16)
(GPIO_0)
(1%)
Charging IC
C236
1u
CUS02
D201
C239
27p
100K
R217
ISL6299
U206
BAT
10
CRDL
1
8
GND
ICDL
9
6
IMIN
PGND
11
2
USB
USBON
7
4
_CHG
_EN
5
_PPR
3
VCHARGE
2V8_VEXT
C238
1u
C237
1u
VUSBIN
27K
R216
10K
R219
0
R215
VUSBIN
10K
R214
R213
100K
VBAT
100K
R218
CHG_STAT
CHG_EN
Figure 3-18. CIRCUIT FOR BATTERY CHARGING
Summary of Contents for KG920
Page 3: ... 4 ...
Page 48: ...3 TECHNICAL BRIEF 49 3 8 2 AFE Analog Front End Figure 3 22 ...
Page 52: ...3 TECHNICAL BRIEF 53 3 8 5 MBGM01 5M CCD ISP Figure 3 25 ...
Page 55: ...3 TECHNICAL BRIEF 56 3 8 6 MV8620 5M back end IC Multi Media Function Figure 3 26 ...
Page 58: ...3 TECHNICAL BRIEF 59 3 9 MIDI IC YMU787 Figure 3 27 YMU787 BLOCKDIAGRAM ...
Page 108: ...4 TROUBLE SHOOTING 109 CIRCUIT WAVEFORM Figure 4 59 Graph 4 11 Figure 4 60 Figure ...
Page 109: ...4 TROUBLE SHOOTING 110 TEST POINT U602 FB602 U100 Q100 Q101 C113 C114 Figure 4 61 Figure 4 62 ...
Page 112: ...4 TROUBLE SHOOTING 113 Figure 4 67 Figure 4 68 CIRCUIT ...
Page 115: ...4 TROUBLE SHOOTING 116 WAVEFORM Graph 4 13 ...
Page 139: ...6 BLOCK DIAGRAM 140 6 BLOCK DIAGRAM Figure 6 1 ...
Page 148: ... 149 8 PCB LAYOUT ...
Page 149: ... 150 8 PCB LAYOUT ...
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