Table 4-9 Definitions Of Signals Of The Tp Circuit - Huawei MediaPad 10 fhd Maintenance Manual

MediaPad10 FHD Maintenance Manual
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Circuit analysis
The TP involves simple power interfaces. It has only two power channels, one of which
is 3.3 V and the other is 1.8 V. The 3.3 V voltage is separately supplied to prevent system
power ripples from affecting the usage effect of the TP. The 1.8 V voltage provides the
I/O power. There is no power-on sequencing requirement for both voltages.
The IIC interface is used for data transmission. Its signal level is 1.8 V.
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Fault analysis and location
Symptom: The TP does not respond at all, or partially responds.
Solution: Check whether the BTB jack is properly soldered and in good contact. Then
check whether the two power channels normally supply power and whether the IIC buses
are working properly.
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Circuit signals
Table 4-9 lists the signals of the TP circuit.

Table 4-9 Definitions of signals of the TP circuit

Signal Name
GPIO61_TP1V8_EN
TP_SCL
TP_SDA
2012-10-09
Function
1.8 V power switch of the TP
IIC of the TP
IIC of the TP
Huawei Confidential
INTERNAL
Test Reference Value or
Oscillogram
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