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Custom Calypso Board » History » Version 2

laforge, 02/19/2016 10:48 PM

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= Custom Calypso Board =
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This wiki page is about creating a custom TI calypso board.
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The rationale is quite simple: The supply of Motorola/Compal phones is limited, and the quality that's available
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at this point often is some quite extensively repaired (not just refurbished) phones.
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As the TI Calypso/Iota/Rita chipset is still available in quantity from the grey market, we can simply build our
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own board from it.
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== Existing design ==
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We have an existing Ti Calypso design similar to that used in the Compal/Motorola phones.
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It does not have an interface for LCM or Keypad.
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== Intended features ==
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 * expose JTAG on a standard header
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 * board-edge connector for plugging many boards into one backplane
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 * external clock input / buffered clock output
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 * RF connector standard u.fl or SMA or optionally separate Rx/Tx on the back-plane
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 * I2C/SPI and both UARTs available on headers
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 * on-board EEPROM for storing persistent data, even beyond NOR flashing
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 * SIM card slot, SIM interface also present on header
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 * additional / unused TPU ports
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 * header for TSP / TPU and all data/control interfaces between iota/rita/calypso
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 * RTC crystal and footprint for backup battery
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 * version of the board with uplink / downlink filters switched
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