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
- 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
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