Huawei MediaPad 10 fhd Maintenance Manual page 21

MediaPad10 FHD Maintenance Manual
BUCK2 serves as the primary power of the GPU, and outputs 1.1 V by default. Its maximum
current is 1400 mA. SPI interfaces are applied to switch on or off BUCK2 and adjust the
output voltage of BUCK2, so that the power consumption of the system is effectively
controlled.
BUCK3 supplies power to the peripherals of the Hi3620, and outputs 1.1 V by default. Its
maximum current is 1100 mA. BUCK3 is switched on or off by controlling the external
hardwire signal BUCK3_EN.
BUCK4 supplies power to the I/O of the Hi3620 (by default the power voltage is 1.8 V) or the
LP DDR2 (by default the power voltage is 1.2 V). Its maximum current is 1000 mA. The
default output voltage varies according to different applications. The default output voltage is
controlled by the external hardwire signal BUCK4_VC.
BUCK5 serves as the input power of LDO2 and LDO3 to improve the operating efficiency of
low dropout (LDO) regulators. Its maximum current is 500 mA.
Of the 24 LDOs, 21 LDOs supply power to the following components:
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All these power channels support power saving (in dormant or ECO mode). The rest three
LDOs supply power to an audio circuit (including HKADC), a PMU analog circuit, and a
PMU digital circuit. The charge pump supplies power to the HDMI, and provides the backup
battery charging function.
Audio Unit
The audio unit integrates a sigma-delta audio codec, which makes possible flexible resource
configuration and provides abundant audio applications to meet audio processing
2012-10-09
MLC NAND
26 MHz clock oscillation circuit
AP system area
DDR HPY I/O
MIPI
3620 and Hi6421V200 digital I/O
3620 2.6 V I/O
microSD card I/O
USB PHY
eFuse
Bluetooth
GPS
microSD card
CMMB
Wi-Fi I/O
Wi-Fi core
LCD I/O
LCD analog
Camera I/O
Camera analog
Camera VCM
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INTERNAL
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