The LV1b FC has the following hardware:
PIC17C766 Microcontroller
- Runs at 33MHz (Tcycle = 4 Tclock = 121.21ns)
- 16K program memory (EPROM)
- 902 general purpose registers (RAM)
- In-circuit Serial Programmability (ISP)
- 2 Independent UARTs
- 4 Independent timers
- Interrupt on Port B change of state
- Up to 66 digital I/O pins
- 12 channel 10bit 55ksps ADC
Inertial Measurement Unit:
- Maxim MAX197A 8 channel 12bit 100ksps ADC
- 3 Tokin CG-16DO ceramic rate gyroscopes
- 2 Analog Device's 2-axis MEMs accelerometers (ADXL250, ADXL202)
- Motorola MPX5100A pressure sensor
- Precision voltage (and thus reference) circuitry
Other Systems:
- ISP Port attached to UART1, MCLR, and general purpose I/O pins
- Downlink (19.2kbps UART data stream going down Lynx modems) attached to UART1
- Rockwell GPS board (GPS)(NMEA or binary messages at 4800bps) attached to UART2
- Debug port: In through UART1 Rx (19.2kbps) and out throught UART2 Tx (4800bps) to a PC
- Uplink (decoded 4 bit nibble from uplink DTMF radio system) attached to PortB
- Launch Tower Umbilical (LTU) ( includes Launch Detect, Rocket Ready, T minus 5) attached to Port B
- Boot select jumper (possible mode select as well) attached to PortB
- Power Control bits for Downlink Power Amplifier (PA) power control (Hitachi #?) attached to 3 gen. purpose digital I/O
- 1MB SRAM (using 2 Maxim MXD1210battery backup ICs) attached general purpose digital I/O
- 2 IRF IPS521G Intelligent MOSFET Switch ICs (for pyrotechnic firing switches) attached to 4 gen. purpose digital I/O pins
- Spare 3 pin general purpose digital I/O port
- 2 Igniter Test Systems (ITS) attached to 2 general purpose digital I/O pins and 2 PIC ADC channels
- Separation Detect (SPD) (photoresistor) attached to PIC ADC channel
- IMU temperature (Timu) (thermister) attached to PIC ADC channel
- External temperature (Text) (thermistor) attached to PIC ADC channel