Detailed Analysis Of Working Principles Of The Ap Subsystem; Figure 4-7 Working Principles Of The Pmu; Table 4-1 Voltage Signals Of The Ap Power Circuit - Huawei MediaPad 10 fhd Maintenance Manual

MediaPad10 FHD Maintenance Manual
4.3.2 Detailed Analysis of Working Principles of the AP
Subsystem
Working Principles of the AP Power Circuit
l
Figure 4-7 shows the working principles of the PMU.

Figure 4-7 Working principles of the PMU

l
Table 4-1 lists these voltages.

Table 4-1 Voltage signals of the AP power circuit

Signal Default
Name Voltage
BUCK0/1 1.1 V
BUCK2 1.1 V
2012-10-09
Working principles
The power management of the K3 Hi3620 is implemented by a dedicated power
management IC Hi6421. The power supply of the AP and that of some peripherals are
obtained from the Hi6421.
Circuit analysis
The HI6421 converts the primary power voltage VHP_PWR into various voltages during
power-on.
Programmable Voltage Range
0.7–1.60, 128 steps, best efficiency point = 400 mA
0.7–1.60, 128 steps, best efficiency point = 400 mA
Huawei Confidential
INTERNAL
Maximum Default
Current Status
2.0 A ON
1.4 A ON
Page 45 of 78