Table 4-4 Definitions Of Signals Of The Coulometer Circuit - Huawei MediaPad 10 fhd Maintenance Manual

MediaPad10 FHD Maintenance Manual
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Table 4-4 lists the signals of the coulometer circuit.

Table 4-4 Definitions of signals of the coulometer circuit

Signal Name
VPH_PWR
BAT_CON_TS1
V_BATT
I2C0_SCL
I2C0_SDA
Working Principles of the eMMC Circuit
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Figure 4-11 shows the working principles of the eMMC circuit.
2012-10-09
The BQ27510 uses a technology called impedance tracking. An LDO is integrated to
monitor the electric energy of the system battery and can be directly driven by the
battery with fewer external circuits under any system voltage condition.
In addition to the simplified design and integration of battery monitoring, the system can
exactly measure the remaining electric energy of each lithium ion battery, so that the
battery endurance can be predicted even if the battery has aged. The precise battery
energy measurement function helps the system to intelligently manage the remaining
electric energy of the battery, notify users of the remaining system runtime, and prolong
the system runtime as much as possible.
The mobile application processor just relies on precise battery data to better optimize the
power system efficiency of mobile devices. The BQ27510 will precisely give an alert
about the remaining electric energy of the battery to users, so that users can save data to
non-volatile memory before the system is closed. This ensures that users' work is not lost
before the electric energy of the battery is exhausted.
The BQ27510 circuit features simple design. The battery voltage and battery NTC are
connected to circuit components, and IIC control is applied. In addition, differential
current detection is implemented.
Fault analysis and location
Symptom: The remaining electric energy of the battery is low, causing the system to be
powered off. Probably the data Flash of the BQ27510 is abnormal or IIC access fails.
Solution: Replace related components.
Circuit signals
Function
Primary power used to supply power to
the internal LDO
Battery NTC used to monitor the
temperature of the battery
Input end for battery voltage detection
IIC interface
IIC interface
Working principles
Huawei Confidential
INTERNAL
Test Reference Value or
Oscillogram
Power voltage range: 0–4.2 V
Power voltage range: 0–4.2 V
1.8 V
1.8 V
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