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Booster Pack Tips


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Here is my tip for designing booster packs which rely on SPI.

Value line chips come with USI or USCI modules that can be used SPI comm, however, some signals are not on the same pins.

To make you booster pack compatible with all value line chips, you have to be able to swap two pins, P1.6 (SDO/UCB0SOMI) and P1.7 (SDI/UCB0SIMO,) and all you have to do is use one 2x2 header. SCLK/UCB0CLK is OK. Slave select (SS) often called chip select (CS) or slave transmit enable (STE,) is also OK since only USCI's UCB0STE is hardwired.

 

USI: short 1-2 and 3-4

USCI_B: short 1-3 and 2-4

post-197-135135521815_thumb.pngpost-197-135135521819_thumb.png

 

If you want to go even further and add USCI_A0 to the mix, you will have to use 3 1x3 headers.

 

USI: short J5 2-3, J4 2-3, and J4 4-5

USCI_B: short J5 2-3, J4 2-4, J4 3-5

USCI_A: short J5 1-2, J4 1-2, J4 5-6

post-197-135135522085_thumb.pngpost-197-135135522088_thumb.png

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