X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=Notebook;h=d793c7e2ed0f093f26cfe4cf147c14499ae8cee9;hb=441c50dba0115a1a7429ade9fd9c9990a5dcef8a;hp=c9e696478a784ea12a17f321ee898c853a16a405;hpb=908a69d9419a7729f82d53b1fc7833b993af5997;p=hw%2Ftelemega

diff --git a/Notebook b/Notebook
index c9e6964..d793c7e 100644
--- a/Notebook
+++ b/Notebook
@@ -84,7 +84,7 @@
 
 2011.11.23
 - decisions based on IRC conversation with keithp
-	- GPS on usart3 PC10/11 doesn't conflict with the serial bootloader
+	+ GPS on usart3 PC10/11 doesn't conflict with the serial bootloader
 	- pick either usart1 or usart2 on PD5/6 or PA9/10 for bootloader
 	- flash and companion can share an SPI, sensors need dedicated SPI
 	- use 3 screws for v_pyro, either jumper to tie to v_lipo or attach
@@ -96,20 +96,121 @@
 	- include a screw attached to ground, easy attach for magnetic switch
 	- that makes 18 screws, use two 9's back to back
 
-	- silicon	
-		- STM32L151VBT6 Cortex-M3 SOC
-		- CC1120 digital radio				spi2
-		- W25Q64BVZEIG 64Mbit flash			spi2
+	- silicon							q100 $
+		- STM32L151VBT6 Cortex-M3 SOC				5.39
+		- CC1120 digital radio				spi2	6.60
+		- W25Q64BVZEIG 64Mbit flash			spi2	2.06
 
 	- sensors
-		- Freescale MMA6556KWR2 120g 1-axis accel	spi1
-		- Bosch BMA250 16g 3-axis accel			spi1
-		- Meas Spec MS5607 baro sensor			spi1
-		- ITG-3200 2000 deg/sec 3-axis gyro		i2c1
-		- SkyTraq Venus 638 GPS				usart3
+		- Freescale MMA6556KWR2 120g 1-axis accel	spi1	5.00
+		- Bosch BMA250 16g 3-axis accel			spi1	3.07
+		- Meas Spec MS5607 baro sensor			spi1	6.35
+		- ITG-3200 2000 deg/sec 3-axis gyro		i2c1	8.00
+		- SkyTraq Venus 638 GPS				usart3	10.00
 
 	- companion port					spi2
 								i2c2
 						bootloader intf	usart1
 								usart2
+To Do
 
+- tweak up the paste mask dimensions and so forth on BMA250.py, which is sort
+  of crude at the moment .. see page 68 of the BMA250 data sheet
+
+2011.11.29
+- Eleazar Zuniga <ezuniga@taoglas.com> says in email of 28 Nov 2011 that we 
+  should be able to use any of the pin or SMT patches other than the 35mm ones,
+  as long as we have ground plane under the patch itself that's as large as the
+  patch or bigger.  I'm not sure I believe that, but adding an 0402 site to 
+  ground for a tuning cap ala what the chip antenna docs call for might be a
+  reasonable thing to try?
+
+  pinned versions
+
+    GP.1575.12.4.A.02
+	12x12x4 mm, pin plus adhesive
+	gain towards zenith -0.5 dBic
+
+    GP.1575.15.4.B.02
+	15x15x4 mm, pin plus adhesive
+	1.0 dBic at zenith
+
+    GP.1575.18.2.A.02
+	18x18x2 mm, pin plus adhesive
+	gain towards zenith -0.5 dBic
+
+    GP.1575.18.4.A.02
+	18x18x4 mm, pin plus adhesive
+	gain towards zenith +3.5 dBic
+	$4.13 at q100				*** 50% the mass of 25mm
+
+    GP.1575.25.2.A.02
+	25x25x2 mm, pin plus adhesive
+	+2.0 dBic gain at zenith
+
+    GP.1575.25.4.A.02
+	25x25x4 mm, pin plus adhesive
+	gain towards zenith +3.5 dBic
+	$4.05 at q100
+
+  surface-mount versions
+
+    SGP.1575.12.4.A.02
+	12x12x4.5 mm
+	-2.0 dBic at zenith, 4dB axial ratio, 6Mhz bandwidth
+
+    SGP.1575.15.4.A.02
+	15x15x4.5 mm
+	+1.0 dBic at zenith, 3dB axial ratio, 6Mhz bandwidth
+
+    SGP.1575.18.4.C.02
+	18x18x4.5 mm
+	+1.0 dBic at zenith, 4dB axial ratio, 5Mhz bandwidth
+	$4.94 at q100
+
+    SGP.1575.25.4.C.02
+	25x25x4.5 mm
+	+2.0 dBic at zenith, 3dB axial ratio, 5Mhz bandwidth
+
+  By comparison the data on the chip antenna from Pulse Engineering we're
+  trying out on TeleTerra is:
+
+    W3011A
+	required PCB surface around around 6x8 mm on a board edge
+	+1.0 dBic peak
+	$1.28 at q100
+
+  From all of this, GP.1575.18.4.A.02 would seem to be the clear winner.  It
+  has 2.5 dB more gain than the chip antenna at the expense of a bit more 
+  mass.  However, if the chip antenna performance is "adequate", it saves
+  surface area, mass, and BOM cost.
+
+2011.12.01
+- traded email with Invensense, their US distributor is cdiweb.com, they
+  have ITG-3200 in stock for $10 each and $8 in q100, and they have the new
+  IMU-6000 gyro+accel part for $15 each or $13 at q100.  
+
+	http://www.cdiweb.com/Manufacturers/invensense
+
+	http://www.cdiweb.com/ProductDetail/ITG3200/405256
+	http://www.cdiweb.com/ProductDetail/MPU6000/420595
+
+2012.02.06
+- so where are we...
+
+	- silicon							q100 $
+		- STM32L151VBT6 Cortex-M3 SOC				5.39
+		- CC1120 digital radio				spi2	6.60
+		- W25Q64BVZEIG 64Mbit flash			spi2	2.06
+
+	- sensors
+		- Freescale MMA6556KWR2 120g 1-axis accel	spi1	5.00
+		- Meas Spec MS5607 baro sensor			spi1	6.35
+		- IMU-6000 gyro+accel 					13.00
+		- SkyTraq Venus 638 GPS				usart3	10.00
+		- Honeywell HMC5883L magnetic sensor
+
+	- companion port					spi2
+								i2c2
+						bootloader intf	usart1
+								usart2