snapshot

[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.
 
-- 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
@@ -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.
+
+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