3. TECHNICAL BRIEF
- 52 -
3.14. USB charging circuit
The USB charging circuit is a fully integrated USB VBUS voltage single-cell Li-ion battery charger
circuit. The charger uses a CC/CV charge profile required by Li-ion batteries. CC charging current and
End of charging current is programmable I
REF
& IMIN resistors.
I
REF
resistor between this pin and the GND pin to set the charge current limit determined by the
following equation:
I
CC
= 12089/33K = 366mA
The End Of Charging current is set by I
MIN
That can be programmed by the as following equation:
I
EOC
= 11000/220K = 50mA
2V72_IO
VBAT
2
R218
220K
U205
ISL6294
BAT
8
GND
5
6
IMIN
7
IREF
PGND
9
1
VIN
_CHG
3
4
_EN
_PPR
0
R221
10K
R250
1u
C243
R219
33K
R251
NA
0
R216
TP217
C242
1u
USB_CHG_ENn
USB_EOCn
VBUS_USB
Figure 26 USB charging circuit
Summary of Contents for KE600
Page 1: ...Date October 2006 Issue 1 0 Service Manual Model KE600 Service Manual KE600 ...
Page 3: ... 4 ...
Page 5: ... 6 ...
Page 53: ...3 TECHNICAL BRIEF 54 3 16 BLUETOOTH Figure 28 BLUETOOTH Functional block diagram ...
Page 69: ...4 PCB layout 70 Figure 45 Main PCB bottom Figure 46 Main PCB bottom placement ...
Page 70: ...4 PCB layout 71 Figure 47 Sub PCB top Figure 48 Sub PCB top placement ...
Page 71: ...4 PCB layout 72 Figure 49 Sub PCB bottom Figure 50 Sub PCB bottom placement ...
Page 89: ...5 Trouble shooting 90 ...
Page 116: ...6 Download S W upgrade 117 6 2 Download program user guide ...
Page 117: ... 118 6 Download S W upgrade ...
Page 118: ... 119 6 Download S W upgrade ...
Page 119: ... 120 6 Download S W upgrade ...
Page 127: ... 128 8 PCB LAYOUT ...
Page 128: ... 129 8 PCB LAYOUT ...
Page 129: ... 130 8 PCB LAYOUT ...
Page 130: ... 131 8 PCB LAYOUT ...
Page 131: ... 132 ...
Page 143: ... 144 ...
Page 145: ... 146 ...
Page 167: ...Note ...
Page 168: ...Note ...