Huawei MediaPad 10 fhd Maintenance Manual page 16

MediaPad10 FHD Maintenance Manual
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SPI Interface
The Hi3620 supports five groups of SPI bus interfaces, all of which work in master mode.
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I2C Bus
The Hi3620 provides four groups of I2C buses. Two groups are dedicated for camera
interfaces, and the other two groups are used for peripherals.
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Digital Audio Interface PCM/I2S
The K3V200 system provides three groups of digital audio interfaces to connect to a codec
inside the Hi6421.
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2012-10-09
UART0: This UART interface is specially used for system commissioning or loading. Its
signal level is 2.5 V.
UART1: This interface is used as the data and control interface of the AP or modem. It
can also be multiplexed as a GPIO interface. Its signal level is 1.8 V or 2.5 V.
UART2: This interface is statically multiplexed with USIM and onewire signals and
reserved for peripherals. Its signal level is 1.8 V.
UART3: This interface is multiplexed with the GPS baseband bus GPS_SPI that is
integrated in the Hi3620. It provides a data and control channel for external third-party
GPS devices. Its signal level is 1.8 V.
UART4: This interface is multiplexed with the Bluetooth baseband interface BT_IF that
is integrated in the Hi3620. It provides a data and control channel for external third-party
Bluetooth devices. Its signal level is 1.8 V.
SPI0: This SPI interface supports a maximum of four chip selection signals. It is
reserved for peripherals, such as the CMMB. Its signal level is 1.8 V.
SPI1: This interface is the communication and control interface of the modem. Its signal
level is 1.8 V or 2.5 V.
PMU_SPI: This SPI interface is dedicated for the PMU (Hi6421) and works in
three-wire mode (the input end and the output end share the same data signal). Its signal
level is 1.8 V.
BT_SPI: This interface is a dedicated SPI interface between a Bluetooth baseband unit
integrated in the Hi3620 and the RF IC (Hi6350). Its signal level is 1.8 V.
GPS_SPI: This interface is a dedicated SPI interface between a GPS baseband unit
integrated in the Hi3620 and the RF IC (Hi6350). Its signal level is 1.8 V.
ISP_I2C0/1: used for camera I2C interfaces.
I2C0: used for the xSenor, capacitive touchscreen, and independent FM communication
and data interfaces.
I2C1: used for the charging IC.
The xSensor and capacitive touchscreen are components that may be frequently accessed. Therefore, the
preceding I2C bus allocation mode is applied by default but a jumper is reserved during design to
connect the capacitive touchscreen to I2C1.
I2S interface: This interface is a stereo audio interface between the Hi3620 and the codec
inside the Hi6421.
M_PCM interface: This interface provides a voice channel between the modem and the
codec inside the Hi6421.
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