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.

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 trought sensors (3V pull-up, 2ms pulse to 0V to select next sensor, 30-40 ms per measurement, 8 pull-down pullses before measurement restart)
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 (4×16 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
 
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