* [Microchip 25LC1024](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en520389) CMOS serial EEPROM instead of DataFlash
* 128k x 8
* SPI interface
-* [Microchip MCP9700A](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en027103) temperature sensor instead of using cc1111 on-chip sensor
-* used 1000uF electrolytic capacitor charged to 5V for pyro charges
+* [Microchip MCP9700A](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en027103) discrete temperature sensor
+ * eliminated in v0.2 to free GPIO line for companion interface
+* used 1000uF electrolytic capacitor charged to 5V for pyro supply
+* two LEDs instead of one attached to CPU
+ * eliminated second LED to free GPIO line for companion interface
## [Production History](production) ##
place parts! Without an inspection microscope, loading and testing these
boards might be impossible.
-* The v0.1 artwork has the USB connector footprint placed wrong, so that the
- connector hangs out over the edge of the board instead of being flush with
- the edge.
-
-* The v0.1 artwork has two issues that require cuts and jumps. The first is
- that we need chip select on the SPI memory. To fix that, we give up the
- ability to put the accelerometer into self-test mode and use that GPIO line
- to pull chip select on the memory. The second is that the igniter sense
- circuits each need a second resistor to complete the voltage divider so our
- 3.3V CPU ADC can read the 5V ejection voltage. This is fixed by changing
- two resistor values, and tacking two additional resistors onto the board
- with jumpers to ground.
+* The v0.1 artwork had three issues, two of which required physical rework
+ on each board. All of these issues were fixed in v0.2.
+
+ * the USB connector footprint was placed wrong, so that the
+ connector hung out over the edge of the board instead of being
+ flush.
+ * we needed chip select on the SPI memory. To fix that, we gave up the
+ ability to put the accelerometer into self-test mode and used that
+ GPIO line to pull chip select on the memory, which required two
+ cuts and two jumpers.
+ * the igniter sense circuits each needed a second resistor to
+ complete the voltage divider so our 3.3V CPU ADC could read the
+ 5V ejection voltage. This was fixed by changing two resistor
+ values, and tacking two additional resistors onto the board
+ with jumpers to ground.
## Artifacts ##