rotated GPS chip and rerouted to get more separation between GPS and UHF

[hw/telemega] / Notebook

diff --git a/Notebook b/Notebook
index d793c7e2ed0f093f26cfe4cf147c14499ae8cee9..2659d9bb6e76af2abb7f500a474d479672a40fcf 100644 (file)
--- a/Notebook
+++ b/Notebook
@@ -214,3 +214,36 @@ To Do
                                                                i2c2
                                                bootloader intf usart1
                                                                usart2
+
+2012.06.17
+- keithp reports what looks like RF getting into the SPI bus that the cc1120,
+  flash, and companion port are on.  looking things over, we should:
+
+       - rotate the cc1120 180 degrees, bringing SPI off the northwest corner
+         and just dealing with the rework that will provoke on the UHF side
+
+       - add 330 ohm / 47pf snubbers on the source end of all SPI lines
+
+       - rework the SPI traces to put the SPI at one end as much as possible
+
+- since MMA6556 remains unobtainium, moving to an Analog Devices part with
+  the 5V switcher may be necessary
+       + elide MMA6556
+       - merge megaaccel content
+
+- cut the big MicroMaTch down to just a 4-pin debug connector for STLINKv2?
+
+- can we use the 64-pin version of the STM32L151?
+       - it looks like the answer is yes, but of course it would require a
+         massive re-routing of the board...
+
++ move the MPU-6000 from I2C to SPI
+
++ leave the mag sensor out
+
+- that leaves nothing on I2C, but if we do use I2C, we need pull-ups!
+
+
+2012.06.30
+- let's move to the u-blox MAX-6Q GPS on v0.2
+       http://www.u-blox.com/en/download/documents-a-resources/u-blox-6-gps-modules-resources.html