
3. TECHNICAL BRIEF
- 53 -
3.10.3.3 Charging control
A programmable charging block in PM6650 is used for battery charging. It is possible to set limits for
the charging current. The external supply typically connects directly to pin (VCHG). The voltage on this
pin (VCHG) is monitored by detection circuitry to ascertain whether a valid external supply is applied or
not. For additional accuracy or to capture variations over time, this voltage is routed internally to the
housekeeping ADC via the analog multiplexer.
PM6650 circuits monitor voltages at VCHARGER and ICHARGE pins to determine which supply
should be used and when to switch between the two supplies. These pins are connected to the Source
(or emitter) and Drain (or collector) contacts of the pass transistor respectively.
U8210 Battery Bar Display(Stand By Condition)
4.2V~3.82V
100~75 (%)
3.81V~3.74V
75~50 (%)
3.73V~3.67V
50~25 (%)
3.66V~3.49V
25~2 (%)
3.48V~3.28V
2~0 (%)
3) Charging current (blue) flows
from the external supply
1) Pass active transistor is "on" -
continuously closed-loop controlled
to regulate the total current
2) Battery transistor is turned on,
connecting battery to VDD node
6) Constant current charging is finished when
the battery reaches its target voltage
4) Total current is set by the current
regulation loop as described earlier
5) Battery voltage is routed to MSM through the PM6650
analog mux (tan); MSM HKADC measures VBAT
PM6650 General
Housekeeping
ADC_BYP
AMUX_IN1 (MPP1)
AMUX_IN2 (MPP2)
Offset and
Scaling
MUX
AMUX_OUT
VREF
REF_OUT
(MPP8)
Monitored
Voltage
Charging
Current
Battery
P-channel MOSFET
ISNS_M
ISNS_P
USB_VBUS
E
C
B
10k
1.0uF
handset supply
voltage (VDD)
S
D
G
Main
Battery
VCHG
CHG_CTL_N
BAT_FET_N
VBAT
from Ext Supply
(3.3 to 14.5 V)
22 uF
or more
VDD pins
E
C
B
47k
4.7uF
from Ext Supply
(3.3 to 5.25 V)
USB_CTL_N
PM6650
Input Power
Management
External Supply
Detector
Trickle Charger
Battery
Control
Battery
Detectors
Under-Volt
Lockout
Charger
Control
VMAXSEL
diff
IMAXSEL
det
det
MUX
VBATDET
THLVB
VREG_5V
USB-OTG
host power ckt
Summary of Contents for U8210
Page 22: ...3 TECHNICAL BRIEF 23 Figure 3 2 1 1 RTR6250 IC Functional Block Diagram ...
Page 37: ...3 TECHNICAL BRIEF 38 Figure 3 5 12 1 Bluetooth system architecture ...
Page 110: ...4 TROUBLE SHOOTING 111 USB_D USB_D USB_VBUS X100 48M 48MHz ...
Page 115: ...4 TROUBLE SHOOTING 116 LCD Control data flow ...
Page 117: ...4 TROUBLE SHOOTING 118 LCD Control data flow ...
Page 122: ...4 TROUBLE SHOOTING 123 TR400 ...
Page 124: ...4 TROUBLE SHOOTING 125 FLASH_ON from Main Bíd PM6650 CN1 Flash LED ...
Page 127: ...4 TROUBLE SHOOTING 128 FB503 CN500 FB502 CN2 CN1 ...
Page 129: ...4 TROUBLE SHOOTING 130 C627 Head_set Output Pin 4 5 C626 CN304 R624 ...
Page 131: ...4 TROUBLE SHOOTING 132 R649 CN300 CN2 CN1 U605 C633 R648 C634 R622 R623 ...
Page 133: ...4 TROUBLE SHOOTING 134 R649 CN300 CN2 CN1 U605 C633 R648 C634 R622 R623 ...
Page 135: ...4 TROUBLE SHOOTING 136 C627 Head_set Output Pin 4 5 C626 CN304 R624 ...
Page 137: ...4 TROUBLE SHOOTING 138 R649 CN300 CN2 CN1 U605 C633 R648 C634 R622 R623 ...
Page 139: ...4 TROUBLE SHOOTING 140 C627 Head_set Output Pin 4 5 C626 CN304 R624 ...
Page 141: ...4 TROUBLE SHOOTING 142 MIC Contact C404 C401 ...
Page 143: ...4 TROUBLE SHOOTING 144 C115 Head_Phone Input Pin 2 3 C102 CN304 R624 ...
Page 146: ...4 TROUBLE SHOOTING 147 Receptacle 4 6V 4 6V ...
Page 151: ...5 BLOCK DIAGRAM 152 Top Side ...
Page 152: ...5 BLOCK DIAGRAM 153 Bottom Side ...
Page 154: ...6 DOWNLOAD 155 It is ready for downloading ...
Page 160: ...6 DOWNLOAD 161 6 Click on Download to download ...
Page 165: ...6 DOWNLOAD 166 Downloading the Module image Finally Download has been complete ...
Page 168: ...6 DOWNLOAD 169 When you meet the NV Restore error Connect to the phone ...
Page 170: ...6 DOWNLOAD 171 Select the proper file and click on Restore Reading the NV file and restore NV ...
Page 200: ... 201 9 PCB LAYOUT ...
Page 201: ... 202 9 PCB LAYOUT ...
Page 202: ... 203 9 PCB LAYOUT U8210 KEYPAD SPEY0032001 1 1 TOP ...
Page 203: ... 204 9 PCB LAYOUT ...
Page 204: ... 205 9 PCB LAYOUT ...
Page 206: ... 207 ...
Page 207: ... 208 ...