Datasheet

Functional Description
MC13783 Technical Data, Rev. 3.5
Freescale Semiconductor 37
4.4.1.1 Serial Path Configuration Example
In serial path configuration, the current path used for charging the battery is the same as the supply path
from charger to radio B+. Refer to the block diagram example in Figure 10 on page 37.
Transistors M1 and M2 control the charge current and provide a voltage clamping function in case of no
battery or in case of a dead battery to allow the application to operate. In both cases transistor M3 is
non-conducting and the battery is charged with a trickle charge current internal to the MC13783. The
transistor M3 is conducting in case the battery has to be connected to the application like for normal
operation or for standalone trickle charging. Transistor M2 is non-conducting in case the charger voltage
is too high. A current can be supplied from the battery to an accessory by having all transistors M1, M2
and M3 conducting.
Figure 10. Serial Path Interface Block Diagram
VATLAS GND Separate Input Dual Path
VATLAS Hi Z Separate Input Single Path
VATLAS VATLAS Separate Input Serial Path
GND GND Reserved
GND Hi Z Reserved
GND VATLAS Reserved
Table 22. Charger Mode Selection (continued)
CHRGMOD1 CHRGMOD0 Charger Mode
0.1 Ω
BP
M1 M2
M3
R2
R1
20 mΩ
Battery
Charger/USB
Input
BP or
CHRGRAW
Hi Z
Vatlas
Charge Path
Regulator
with Current
Limit and
OV
Protection
+
-
VCHRG[2:0]
Voltage
Error Amp
Chrg In
Diff Amp
Chrg In
Error Amp
BP Voltage
Regulator
and OV
Protection
CHRGISNSP BPFET
+
-
To Scaling and A/D
4
3
+
-
+
-
+
-
+
-
BP
Ref
Voltage
Error Amp
OC
Comp
BP
Curr Out
Dif f Amp
FET Switching
Ctrl Logic
ICHRGTR[2:0]
3
Trick le
Charge
Control
BA TT
FETOV RD
FETCTRL
From Charger
Detection Block
+
-
BATTISNS
Bat In
Dif f Amp
To Scaling and
A/D
Charger
Detection
and OV
Block
OVCTRL [1:0]
2
To USB
CHRGCTRL
BA TTFET
ICHRG[3:0]
OC _R E F
CHRGLED
CHRGMOD1 CHRGMOD0 CHRGISNSN
CHRGRAW
VBUS
To Scaling and
A/D