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====== Vaisala weather sonde hardware ======

===== Sensors stick =====

TODO image

^ name ^ description ^
| tempC | temperature sensor (capacitive ?) |
| HUM1 | humidity sensor 1 |
| HUM2 | humidity sensor 2 |
| temp2 | thermistor |

===== Connectors ======

^ name ^ description ^
| CON1 | service connector - used for programming and during calibration |
| CON2 | external sensors connector |
| CON3 |  |
| CON4 | service connector + other |
| CON5 | join main board and TX boarx |
| CON6 | join main board with sensors board |
| CON7 |  |
| CON8 |  |

  * GPS antenna: 3dBic (dB - isotropic circular), RHCP, omnidirectional

===== pinouts =====

Pinouts as used in this project.

{{:project:weathersonde:side_a.png?direct&300|}} {{:project:weathersonde:side_b.png?direct&300|}}

==== CON1 ====

^ pin ^ description ^
| 1 | GND |
| 2 | +9Vcc - 9 V |
| 3 | ?   (to u-controller pin 27, pull-up) |
| 4 | ?   (to u-controller pin 26, floating) |
| 5 | ?   (to u-controller pin 45, pulled-down) |
| 6 | NC |
| 7 | ?   (to u-controller pin 46, pull-up) |
| 8 | SPI_SS_EEPROM - SPI select EEPROM|
| 9 | SPI_MOSI |
| 10 | SPI_CLK |
| 11 | SPI_MISO |
| 12 | RESET - ground to switch into service mode |

==== CON4 ====
^ pin ^ description ^
| 1 |  |
| 2 |  |
| 3 | GND |
| 4 | GND |
| 5 | ? (to u-controller pin 27, pull-up) |
| 6 | ? (to u-controller pin 26, floating) |
| 7 | ? (to u-controller pin 45, pulled-down) |
| 8 |  |
| 9 | ? (to u-controller pin 46, pull-up) |
| 10 | SPI_SS_EEPROM - SPI select EEPROM |
| 11 | SPI_MOSI |
| 12 | SPI_CLK |
| 13 | SPI_MISO |
| 14 | RESET - ground to switch into service mode |
| 15 |  |
| 16 | +2V8cc - 2.8 V, generated by regulator (IC ?? TODO) from +9Vcc |

==== CON5 ====

TODO: the following must be re-checked

^ pin ^ description ^
| 1 | Logic VCC (3.45V) |
| 2 | Serial Clock (2400Hz) |
| 3 | Serial Data (2400 Baud) |
| 4 | TX Enable? Stays low when clock starts, but goes high later (when serial data is present) |
| 5 | SPI Data Input |
| 6 | GND |
| 7 | 16MHz clock from GPS Module |
| 8 | GND |
| 9 | SPI Clock |
| 10 | TX Programming?? - Could be Chip Select |
| 11 | Internal LDO Inhibit. Is wired to the module's LDO regulators Inhibit pin via 10k resistor. |
| 12 | TX Inhibit - Connected to Base of Switching transistor inside module. |
| 13 | Main Power - Measured Battery Voltage on this pin (12V in my case) |
| 14 | GND |

==== CON6 ====

^ pin ^ name ^ description ^
| 1 | VCC | power (9V) |
| 2 | HEAT_TOP | enable heating for upper humidity sensor (0 V - disabled, 3V - enabled) |
| 3 | MEAS | measurement signal with varying frequency, (2.75V, square, f ~= 10kHz) |
| 4 | GND |
| 5 | THERM | connect directly to thermistor on sensors stick (silver blob) |
| 6 | START | restart measurement cycle (3V pull-up, 1 ms pulse to 0V, repeats with 1sec period) |
| 7 | SENS_SELECT | cycle through sensors (3V pull-up, 2ms pulse to 0V select next sensor, 30-40 ms per measurement, 8 pull-down pulses before measurement restart. The sensor order is the same as order of measurement data in data frame) |
| 8 | HEAT_BOTTOM | enable heating for lower humidity sensor (0 V - disabled, 3V - enabled) |


TODO: other connectors


===== Parts - Integrated curcuits description =====

=== IC1 - SPI EEPROM ===
  * type: M95256
  * description: 256 kbit SPI EEPROM

=== IC2 ===
  * type: DSP1C \\ VAISALA \\ 1037C \\ 03004
  * package: 64-TQFP (4x16 leads square)
  * description: controller, details unknown (CPU, ASIC? DSP?)

DSP1C is made and developed by VLSI specificaly for VAISALA. Is based on VS-DSP (ver 1. ?) DSP core. No more information can be provided by VLSI.

=== IC3 ===
  * type: uN8021C
  * description: GPS FR fronend

=== IC4 - RF PCB ===

  * type: TX1B \\ VAISALA \\ 1129G \\ 37133

=== IC5 - RF PCB ===
  * type: L4931C50 \\ (ST) GK23b

Very low drop voltage regulator (5.0 V) with inhibits.

=== IC6 - sensors PCB ===
  * pins: 24
  * type: VAISALA1608B1 \\ G1223 \\ 40981

=== IC7 - sensors PCB ===
  * pins: 8
  * type: C25 \\ 03 \\ nD2 \\ 28

=== IC8, IC9 - sensors PCB ===
  * pins: 6
  * type: r13
  * description: NPN and PNP transistor in single package

=== P1 ===
  * capacitive barometric sensor
  * BAROCAP Capacitive aneroid
  * range: 3-1060 mb