snapshot work in progress on v0.2

[hw/telemetrum] / Notebook

diff --git a/Notebook b/Notebook
index ab111a417377d4b9b71b0b6bd13b307e8112c89e..3542ca466275d10827d419fcf0032ee0a1c6a6af 100644 (file)
--- a/Notebook
+++ b/Notebook
@@ -105,8 +105,12 @@
   Keith found gps active antennas with cable to U.FL connectors and Molex sells
   cables with U.FL to bare leads, so this should cover the bases.
 
   Keith found gps active antennas with cable to U.FL connectors and Molex sells
   cables with U.FL to bare leads, so this should cover the bases.
 

-- TelePyro doesn't need a CPU.  How about an SPI to I2C converter chip with
-  GPIO lines and an I2C ADC chip?
+- TelePyro doesn't really need a CPU.  How about an SPI to I2C converter chip 
+  with GPIO lines and an I2C ADC chip?  Cheaper and easier than a PIC?
+
+       PIC16F882 in SSOP-28 is $2.10 per, 1.41 @ 25 units
+         -- PIC16F883 is $2.12, PIC16F886 is $2.32, have better memories
+       CP2120 in QFN-20 is     $2.41 per, 2.27 @ 25 units

 
   The Silabs CP2120 has 8 gpio lines but is only available in QFN20.  The NXP
   part I discovered earlier, the SC18IS600, has 4 full gpio lines and 2 lame-o
 
   The Silabs CP2120 has 8 gpio lines but is only available in QFN20.  The NXP
   part I discovered earlier, the SC18IS600, has 4 full gpio lines and 2 lame-o


@@ -143,3 +147,9 @@
 - another way to think about all this is that I could panelize a set of boards
   all done in 2 layers, then treat that as a sub-panel I put N copies down of
   to fill up a 33each.com max panel size.
 - another way to think about all this is that I could panelize a set of boards
   all done in 2 layers, then treat that as a sub-panel I put N copies down of
   to fill up a 33each.com max panel size.

+
+2009.10.16
+- move to AT45DB161D 16-megabit SPI "DataFlash" EEPROM from Atmel?
+       AT45DB161D-SU-ND in SOIC-8 for $2.26 each
+  appears to compare favorably against $4.40 for current 128kx8 part
+  minor concern about write power, but probably red herring