Samsung SCH-i830 Service Manual page 17

Circuit Description
2-6-6. All the Peripherals
Memory card
The MultiMediaCard Controller on the Intel PXA272 can communicate with either:
● a MultiMediaCard (MMC)
● a Secure Digital (SD) Memory Card
● a Secure Digital I/O (SDIO) Card
IrDA(U200:HSDL-3003)
● IrDA Data Compliant 115.2kbit/s with Remote Control Transmission Infrared Transceiver.
● a small form factor single enhanced infrared transceiver module that provides
the combination of interface between logic and IR signals for through-air, serial,
half-duplex IR data link, and IR remote control transmission operating at 940nm
for universal remote control applications.
USB
There is a USB Client in the Phone part and PDA part each.
The USB signals are switched to the interface connector via MUX(U604, MAX4636).
The USB interface of the Phone part is used for downloading and data service.
The USB of the PDA part is used for downloading user files and application programs by Active Sync to
PC.
UART
There is a UART port in the Phone part and PDA part each.
The UART signals are switched to the via the MUX(U601, MAX4684).
KEYPAD
For user interface, a keypad is used for function. For key recognition, a key matrix is set up using
signals KBC_(0)~(6) and KBR_(0)~(7) of the PXA272.
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