Jump to content

Booster Pack Tips

Recommended Posts

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



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


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...