Figure 4-10 Working Principles Of The Coulometer Circuit; Table 4-3 Definitions Of Signals Of The Ap Charging Circuit - Huawei MediaPad 10 fhd Maintenance Manual

MediaPad10 FHD Maintenance Manual

Table 4-3 Definitions of signals of the AP charging circuit

Signal Name
VCHG
DCM
CEN
IUSB
VPH_PWR
ISET
V_BATT
Working Principles of the Coulometer Circuit
l
Figure 4-10 shows the working principles of the coulometer circuit.

Figure 4-10 Working principles of the coulometer circuit

l
2012-10-09
Function
Power input end of the charger
Charger input detection
Charging control mode
Charging current enabling signal, which
is Active-low
A signal used to restrict the input current
of the USB peripheral inserted into the
host
Primary power supply to the power
module
A signal used to control the battery
charging current (The maximum battery
charging current is 2 A)
Input end during battery voltage detection
and output end during trickle charging
The detection status does not change.
Only the port is detected.
Working principles
Circuit analysis
Huawei Confidential
INTERNAL
Test Reference Value
or Oscillogram
Detectable range: 0–6 V
None
Power voltage range:
0–4.2 V
Power voltage range:
0–4.2 V
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