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[[File:RH Circuit.jpg|none|thumb|Relative Humidity Circuit section]]
|
|-
|9, 10, 15, 16, 19, 20, 33, 34
|Ground
|
|-
|2, 8, 18*, 24, 30
| +5VDC
|18 needs more research, may occasionally drop to ground?
|-
|-
|-
|
|-
|-
|-
These traces go to U3 (ST microcontroller)<br />
|Unknown|U14 (Analog MUX) Pin 13 (A0) - 3V rounded square pulses, 2x per second, 2 different periods avg ~75msec?
|
|-
|Unknown
|
|-
|Unknown
|
|-
|Unknown
==Internal Busses==
===TI CC1050 to ST7 Bus===
{| class="wikitable"
!CC1050
Pin
!CC1050
Name
!ST7
Pin
!Notes/Observations
|-
|19
|DI
|Pin18 / OCMP1_A / AIN10 / PF10
|U17 appears to be a level translator between CC1050.19 and ST7.18
|-
|20
|DCLK
|Pin30 / PC7 / SS / AIN15
|U7 appears to be a level translator between CC1050.20 and ST7.30
|-
|21
|PCLK
|Pin29 / PC6 / SCK / ICCCLK
|
|-
|22
|PDATA
|Pin28 / PC5 / MOSI / AIN14
|Voltage varies between 5 and 3.something volts depending on which side is transmitting.
|-
|23
|PALE
|Pin27 / PC4 / MISO / ICCDATA
|
|}<br />
===GPS Chip to ST7 Bus===
{| class="wikitable"
!GPS
Pin
!GPS
Name
!ST7
Pin
!ST7
Name
!Notes/Observations
|-
|33
|TX_A
|1
|RDI
|TSIP@38400baud
|-
|
|
|
|
|
|-
|
|
|
|
|
|-
|
|
|
|
|
|-
|
|
|
|
|
|}
→Option Bytes: Added alternate text to match FlashBash software options.
[[File:LMS-6 Radiosonde.jpg|thumb|LMS-6 Radiosonde found on railroad tracks, circled in red.]]The LMS-6 Radiosonde is a balloon-launched radiosonde manufactured by Lockheed-Martin Sippican, and used for meteorological sounding.
<br />
==Photos==
[[File:LMS6 bottom.jpg|left|thumb|Photo of the lower panel of the 403 MHz version of the LMS-6 Radiosode. Of particular note are the DIP Switch configurations for setting the transmit frequency.]]
[[File:RH Circuit.jpg|none|thumb|Relative Humidity Circuit section]]
<br />
==Disassembly==
This is a minimally-destructive disassembly method that will allow the payload to be held back together with about two feet of duct tape if you wish to reuse the payload for another weather balloon flight.
[[File:20200926 203639.jpg|thumb|Partially-disassembled LMS-6 Radiosonde, with upper styrofoam shell removed. Some RF shielding removed. Rechargeable cells in use for testing purposes.]]
<br />
#Make sure radiosonde circuit board is properly aligned and seated into the bottom half of the shell.
#Replace small styrofoam brick to hold power wires into the compartment. Do not connect any power wires together yet.
#Route the antenna flat against the bottom of the shell and place duct tape over the hole.#Place upper half of shell onto lower half of shell#Using about 20 inches of Duct tape, close the edge of the radiosonde shell, ensuring that the weather sensors are able to exit the side of the shell where they originally did.#Using a small piece Affix the two halves of tapethe radiosonde shell together. Long, close sturdy zip-ties (one around where the area between plastic strap goes, another one or two perpendicular to it over the top and bottom) would likely work well and remain intact while exposed to the weather sensor wirespotentially harsh and cold elements at high altitudes. Alternative closures could be twine (if properly tied) or hot glue, which seems to be what is used to seal the radiosonde at the factory. You Glues and cements may wish to make further re-use additional tape problematic if you intend to keep recover and fly the shell closed effectivelyradiosonde multiple times.
#Place the plastic strap around the radiosonde as originally equipped. You can likely push the staples back into the styrofoam if they're left intact.
#Optionally, re-attach the paper wrapper to the payload, or feel free to attach your own wrapper or identification.
#Replace the plastic pins that hold the plastic strap to the radiosonde payload. You will need to push these pins through the duct tape applied in step 8.#Ensure all sensors and antenna are extended and oriented properly. Be sure to bend the antenna into a dipole orientation similar to how it shipped (about 5.75" of the shorter lead folded back and held about 0.5" away from the twin-lead coming from the radiosonde)#Optionally, use a loop of duct tape to ensure the dipole antenna remains positioned appropriately, similar to how the antenna was originally rigged.
#Attach radiosonde strap to flight rigging (rope/parachute/balloon or your choice of drone, kite, etc)
#Remember to connect the red and white wires, and do a pre-flight telemetry verification immediately before launch.
|-
|4
|1 Hz - U14 (Analog MUX) Pin 9 (S2)
|-
|5
0.3" spacing. Fine gauge insulated wire run along SENS3 wire and loomed in white heat-shrink tubing.<br />
{| class="wikitable"
|+Card edge - 40-pin, looks like ISA spacing0.100" card edge connector!Pin Number!Function!Notes / Observations
!Pin Number
!Function
!Notes / Observations
|-
|1,|Vdd|U3 - VddU15 - Pin 4|2,7,8|Vdd
|U3 - Vdd
U15 - Pin 4
|-
|3
U21 - Pin21 / PCLK
|
|4
|U3 - Pin38/Vpp/ICCSEL
|U3 - Pin39/RESET
|
|6
|U3 - Pin27 / PC4 / MISO / ICCDATA
|
|-
|7
|Vdd
|U3 - Vdd
U15 - Pin 4
|8
|Vdd
|U3 - Vdd
U15 - Pin 4
|-
|9
|GND
|
|10
|GND
|
|-
|J5 - Pin 2
|
|12
|U21 - Pin 20 - DCLK
|3.3v - 4800Hz square wave, clocks the serial data
This is probably not directly connected to U21/DCLK ST7 PortF.4 which is 5V.
|-
|13
|SW1.4
|U3 - Pin10/AIN3/PD3
51K resistor to ground
|14
|
|
|-
|15
|GND
|
|16
|GND
|
|-
|17
|SW1.2
|U3 - Pin8/AIN1/PD1
51K resistor to ground
|18
|SW1.1
|U3 - Pin7/AIN0/PD0
51K resistor to ground
|-
|19
|GND
|
|20
|GND
|
|-
U3 - Pin19
|Appears to be some sort of test-mode select, checked before GPIO initialization.
|22
|
|
|-
|23
|GPS TX Data (38400 BPS)
U3 - Pin1/RDI
|Data bursts
|24
|
| +5VDC ?
|-
|25
|
|
|26
|GPS RX Data (38400 BPS)
Maybe not connected to U3?
|Data bursts
|-
|27
|
|
|28
|
|
|-
|29
|
|
|30
|U22.3
|U22 Pin 3 3V3 Enable (Active Low)
Connected to R38 pull-down
Connected to JP27
|-
|31
|BATT POS
|
|32
|J5 - Pin 3
|
|-
|33
|GND
|
|34
|GND
|
|-
|35
|
|
|36
|SW1.3
|U3 - Pin9/AIN2/PD2
51K resistor to ground
|-
|37
|
|
|38
|U3 - Pin18 / OCMP1_A / AIN10 / PF4
|RED WIRE
|
|40
|Battery voltage
|Around 9VDC measured, 3x3V batteries
|}
Compatible connector: TE Connectivity AMP Connectors 5-5530843-4 such as Digi-Key A31723-ND[https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/5-5530843-4/770549]
*
|+J5 - 4-pin, 2.0mm spacing
!Pin
!UseDescription
|-
|1
|UnknownGND
|-
|2
|UnknownTo (?, maybe nothing); to +5 via R7 (47k) (And Card-Edge pin 11)
|-
|3
|UnknownTo U3.11 (AIN4/PD4) via R47 (100); to +5 via R7 (47k) (And Card-Edge pin 32)
|-
|4
|UnknownGND
|}
{| class="wikitable"
|+SP1 - 2x4-pin, 0.1" spacing
!Pin
!UseDescription!Notes/ObservationsPin!Description
|-
|1
| +5VDC||-All from U9
|2
|-
|3
| +5VDC
|4
|U14 Pin 14 (A1) - 5V, 0.1msec pulse once per second
|-
|5
| +5VDC
|6
|U14 Pin 15 (A2) - 5V, 0.1msec pulse once per second
|-
|7
| +5VDC
|8
|U14 Pin 12 (A3) - 3V, 250msec pulse once per second
|}
SP1 connects to four channels of U14, an 8-channel analog MUX. Pin 2 also connects to R111, non-populated, which would provide a pull-up to +5 at Pin 1.
==Components==
The following is a catalog of active components. Designators italicized still need positive identification; bold have been positively identified. Markings listed where known to help in identification. List additional markings when they differ.
'''U1''' - GPS - [https://www.trimble.com/embeddedsystems/copernicus2.aspx Trimble 63530-50] - 12-channel GPS, 2x serial ports, 2.7-3.3VDC, SBAS, flash almanac/ephemeris/location storage. (The -50 variant is probably a custom variant, and exact capabilities are unknown.) This *This chip defaults to TSIP on the 38400 baud port, which is a binary protocol, and has been captured on this PCB.*[http://ftpserver.org.ru/fileecho/51_EMBED/TSIP.PDF TSIP Protocol Documentation]
''U2 - (Marked G4/905)''
*[http://web.archive.org/web/20200903011648/https://datasheet.octopart.com/ST72F324J6T6-STMicroelectronics-datasheet-14047.pdf 72F324J6T6 - ST72324 - Main Microcontroller, ST7 series Datasheet]
*[https://www.st.com/resource/en/programming_manual/cd00004607-st7-family-programming-manual-stmicroelectronics.pdf ST7 Family Programming Manual ( For coders)]
*[https://web.archive.org/web/20200914132209/https://www.st.com/resource/en/programming_manual/cd00054959-st7-flash-programming-quick-reference-guide-stmicroelectronics.pdf ST7 Flash Programming Quick Reference Guide]
*[https://web.archive.org/web/20200914132013/https://www.st.com/resource/en/programming_manual/cd00004616-st7-family-flash-programming-reference-manual-stmicroelectronics.pdf ST7 Family Flash Programming Reference Manual]
*[https://web.archive.org/web/20200914132431/https://www.st.com/resource/en/programming_manual/cd00004617-st7-family-icc-protocol-reference-manual-stmicroelectronics.pdf ST7 Family ICC Protocol Reference Manual]
*With a buffered 16MHz clock provided by Y3/U12, possible CPU speeds are 8MHz(/1), 4MHz(/2), 2MHz(/4), 1MHz(/8) depending on MCC configuration.
*Instruction timings have yet to be found. The datasheet only says are in the '2-12 cycles per instructionST7 Family Programming Manual', and a note from Raisonance support says that NOP does indeed take 2 cycles. These will be needed before we can bring up a bit-banged software debug UART as well as the bitstream for the CC1050, and may need to be reverse engineered via GPIO+oscilloscope.
''U4 - (Marked Z252)''
'''U21''' - [http://web.archive.org/web/20190202204556/https://www.ti.com/lit/ds/symlink/cc1050.pdf CC1050] (back) - Low Power Transmitter - 300MHz-1000MHz, variable power, FSK
*[https://www.ti.com/lit/er/swrz006a/swrz006a.pdf Errata]
'''U22''' - [http://web.archive.org/web/20200223104004/http://www.ti.com/lit/ds/symlink/tps791.pdf TPS79133DBUR] - 3.3V LDO - for U21
==GPS Subsystem==
Trimble 63530 baud rate is 38400, 5V, connected to ST7 SCI port(Pins 1&2 on ST7, TDO and RDI). Assuming 8N1 framing, this means interrupts must not be disabled for >260 microseconds or else bytes may be lost as the receive shift register overflows.
{| class="wikitable"
|+
!GPS
Pin
!GPS
Name
!Goes to
!
|-
|1
|GND
|ground
|
|-
|2
|GND
|ground (separated to RF subsystem)
|
|-
|3
|RF-IN
|Passives, then GPS antenna
|
|-
|4
|GND
|ground
|
|-
|5
|LNA
|nothing visible
|
|-
|6
|VBAT
|nothing visible
|
|-
|7
|Open
|To VCC3 via C1 & C3
|
|-
|8
|Short
|VCC3 - should be high
|
|-
|9
|Reserved
|VCC3
|
|-
|10
|Reserved
|VCC3
|
|-
|11
|Xreset
|VCC3
|
|-
|12
|Vcc
|VCC3 - C2 bypass to GND at pin 13
|
|-
|13
|GND
|ground
|
|-
|14
|GND
|ground
|
|-
|15
|GND
|ground
|
|-
|16
|Xstandby
|VCC3
|
|-
|17
|Reserved
|nothing visible
|
|-
|18
|Reserved
|nothing visible
|
|-
|19
|PPS
|C9 bypass to GND, Via to back to trace to via to small via connected to R3, then trace to 47k to ground, then some pins on U2 - looks like a level translator - through that then to a hidden via, pops back up at TP36 which is connected to PB4 on the ST7, which triggers ei3(external interrupt 3) in the firmware.
|
|-
|20
|RXD-B
|appears unused
|
|-
|21
|RXD-A
|comes from U4 level translator, splits to pin 24 on edge connector then 10k resistor to Pin16 on ST7 which is PF1
|
|-
|22
|Reserved
|
|
|-
|23
|TXD-A
|38400 baud to the ST7 RDI/Pin1/PE1
|
|-
|24
|TXD-B
|4800 baud appears unused
|
|-
|25
|Reserved
|
|
|-
|26
|Reserved
|
|
|-
|27
|GND
|ground
|
|-
|28
|GND
|ground
|
|}
GPS xSTANDBY - connected to 3.3v
GPS xRESET - connected to 3.3v
==CC1050 Subsystem==
{| class="wikitable"
!CC1050
Pin
!CC1050
Name
!ST7
Pin
!Notes/Observations
|-
|19
|DI
|Pin18 / OCMP1_A / AIN10 / PF4
|U17 appears to be a level translator between CC1050.19 and ST7.18
|-
|20
|DCLK
|Pin30 / PC7 / SS / AIN15
|U7 appears to be a level translator between CC1050.20 and ST7.30
|-
|21
|PCLK
|Pin29 / PC6 / SCK / ICCCLK
|
|-
|22
|PDATA
|Pin28 / PC5 / MOSI / AIN14
|Voltage varies between 5 and 3.something volts depending on which side is transmitting.
|-
|23
|PALE
|Pin27 / PC0
|
|}
[https://github.com/rsaxvc/LMS6APRS/blob/master/docs/cc1050%20frequency%20calculator.ods?raw=true CC1050 Frequency Register Calculator based on 14.7456MHz crystal]
[https://e2e.ti.com/support/wireless-connectivity/zigbee-and-thread/f/158/t/158428?Where-can-one-find-SmartRF-Studio-6- Link to SmartRF Studio6 ( 7 doesn't have the CC1050)]
==Test Points==
===Analog Multiplexer===
U14 is an 8-channel mux/demux. *Four of the channels (A0-A3) go to SP1. *(A4-A7 appear to go to SENS2-4, need to be traced) *Pin 3 is the common in/out, and goes to R13 (560k) and R15 (47k). R15 goes to U15 Pin 7 (555 Reset), and R13 goes to U15 Pin 8 (555 Control.) *Address Select 0 is connected to ST7 Pin 2 / PB0*Address Select 1 is connected to ST7 Pin 3 / PB1*Address Select 2 is connected to ST7 Pin 4 / PB2<br />
==Original Firmware==
!Original Setting
|-
|Watchdog Reset on Halt(Reset On Entering Halt)
|Reset generation when entering HALT mode
|-
|Software (watchdog to be enabled by software)
|-
|Low Voltage Detection Selection(LVD Config)
|Highest Voltage Threshold
|-
MCCBCR does not appear to be initialized, meaning beeper-mode is disabled.
<br />
===ADC Configuration===
ADCDRL does not appear to be used, thus the ADC is operated as an 8-bit ADC instead of 10-bit.
ST7 ADC AIN8 appears to be the only one used.
===Interrupts===
*ei0_int
**Triggered by PortA.3
**uses location 0xB2 as a shift register to output LSB first to CC1050's Data Input on PortF.4
*ei3_int
**Triggered by PortB.4
**Sets a variable when GPS PPS occurs
===GPS Initialization===
On startup, the ST7 sends the following TSIP(0x10 then 0xID, then data with 0x10 double-escaping, then 0x10,0x03) packets to the GPS.
*0x10, 0x8E, 0x2A, 0x01, 0x10, 0x03 - Request Fix and Channel Tracking Info, Type 1
*0x10, 0x8E, 0x26, 0x10, 0x03 - SAVE SEEPROM
*0x10, 0x8E, 0x2B, 0x01, 0x10, 0x03 - Request Fix and Channel Tracking Info, Type 2
*0x10, 0x8E, 0x26, 0x10, 0x03 - SAVE SEEPROM
==Modifications==
When testing, it's important not to transmit on unlicensed frequencies. Emissions can be eliminated by replacing the RF amplifier with a jumper between pins 1 and 3, and terminating the load at the antenna connection. The amplifier is an SOT-89 device just above the "-" terminal of B3. To access the RF chain, the shield housing may need to be temporarily removed. Also remove the bias feed resistor just below the "L104" marking. Then, remove the transmitter antenna from the "ANT1" connections. Use a 50 ohm resistor across the two terminals to provide a terminating load and eliminate any further transmission. Near-field reception is still possible after making these changes.
==Instruction Timing Tables==
These are based on the ST Visual Develop 4.3.12 Simulator. Hopefully it is accurate. I've only done the instructions needed for writing a software UART, since the hardware UART is tied up doing GPS work.
{| class="wikitable"
|+
!instruction
!cycles
!Purpose
!condition tested
|-
|sim
|2
|Set instruction mask(disable interrupts)
|
|-
|nop
|2
|no-op
|
|-
|bres
|5
|bit-reset
|;reset a GPIO pin
BRES PADR, 0
|-
|bcp
|2
|bit-compare
|BCP A,0
|-
|jreq
|3
|jump
|jump not taken
jump taken
|-
|bset
|5
|bit-set
|;set a GPIO pin
BSET PADR, 0
|-
|jrt
|3
|jump "right there"?
|
|-
|ld
|2
|load register/memory to/from register/memory
|LD A, X
|}
==Ideas for doing AFSK modulation on 70CM with CC1050 and ST7==
The goal is to draw an approximation of a sine-wave over time in the frequency domain. This is usually done by drawing a sine-wave with a DAC, low-pass filtering it, and feeding it into an FM modulator, but we don't have those parts.
===FeatherHAB Approach using a similar FSK chip===
The FeatherHAB approach involves using a transmitter with an asynchronous digital modulation input(CC1050 can do this), and oversamping it like a 1-bit DAC. I think this works as long as the input signal is much faster than the charge pump bandwidth, and if so, it should act like a low-pass filter. FeatherHAB uses a hardware timer to drive their digital modulation input, but they do so by sending a variable-length pulse every 19200 Hz.
We might be able to do this using a 19200Hz periodic timer interrupt to set the modulation pin and a one-shot timer to generate another interrupt to clear it. This will use all available timers on the ST7. We cannot use a timer to generate the pulses directly as the ST7 does not wire out any timers on the right pins.
===SFCW-like Frequency Hopping Approach(RSAXVC)===
The CC1050 has a pair of frequency register sets, this allows programming a new frequency then flipping to it using a bit - this takes 4x register writes(16 bits each). We could, like a stepped frequency radar, switch between a series of tones rapidly(perhaps 8x symbol rate). This would look like an unfiltered DAC version of a sine-wave with little stair-steps.
===Why we're not going to do 9600baud 70CM FSK modulation===
For these to be a usable tracker we're going to need ground stations. In the Kansas City metro, there's not many APRS digipeaters on 70cm, and the few there are use 1200 baud AFSK, not 9600 baud FSK.
==ST7 Programming==
The ST7 can be programmed using the RLINK-STD programmer. This programmer is available from Digi-Key https://www.digikey.com/en/products/detail/iotize/RLINK-STD/9923059
===FlashBash Programmer===
The FlashBash ST7 programmer claims to be able to program the ST7 on the LMS-6. This has not been evaluated yet. http://www.spen-soft.co.uk/
FlashBash V3 PCB can be ordered from DirtyPCBs.com: https://dirtypcbs.com/store/designer/details/1826/6489/flashbash-v3-st7-programmer
===LMS-6 Card Edge Interface===
LMS-6 Card edge interface board KiCad schematic and board layout: https://github.com/Reid-n0rc/LMS-6_Interface_Board
LMS-6 Card Edge Interface PCB Rev B can be ordered from DirtyPCBs.com: https://dirtypcbs.com/store/designer/details/1826/6490/lms6-interface-board-rev-b
{| class="wikitable sortable mw-collapsible mw-collapsed"
|+LMS-6 Card Edge Connector Digi-Key BOM
!'''Manufacturer Part Number'''
!'''Manufacturer'''
!'''Digi-Key Part Number'''
!'''Customer Reference'''
!'''Reference Designator'''
!'''Packaging'''
!'''Part Status'''
!'''Quantity'''
!'''Unit Price'''
!'''Extended Price'''
!'''Quantity Available'''
!'''Mfg Std Lead Time'''
!'''Description'''
!'''RoHS Status'''
!'''Lead Free Status'''
!'''REACH Status'''
|-
|885012207095
|Würth Elektronik
|732-8077-1-ND
|C4
|C4
|Cut Tape (CT)
|Active
|2
|0.1
|$0.20
|4457
|12 Weeks
|CAP CER 0.033UF 50V X7R 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|CL21B104KBCNNNC
|Samsung Electro-Mechanics
|1276-1003-1-ND
|C3,C5,C6
|C3,C5,C6
|Cut Tape (CT)
|Active
|4
|0.1
|$0.40
|2366592
|22 Weeks
|CAP CER 0.1UF 50V X7R 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|T491A106K010AT
|KEMET
|399-3684-1-ND
|C7
|C7
|Cut Tape (CT)
|Active
|1
|0.33
|$0.33
|4400267
|7 Weeks
|CAP TANT 10UF 10% 10V 1206
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|CL31A106KAHNNNE
|Samsung Electro-Mechanics
|1276-1075-1-ND
|C8
|C8
|Cut Tape (CT)
|Active
|2
|0.2
|$0.40
|1387438
|22 Weeks
|CAP CER 10UF 25V X5R 1206
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|CL31B475KAHNNNE
|Samsung Electro-Mechanics
|1276-1055-1-ND
|C9
|C9
|Cut Tape (CT)
|Active
|1
|0.2
|$0.20
|124045
|22 Weeks
|CAP CER 4.7UF 25V X7R 1206
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|LH R974-LP-1
|OSRAM Opto Semiconductors Inc.
|475-1415-1-ND
|D1
|D1
|Cut Tape (CT)
|Active
|2
|0.25
|$0.50
|89674
|12 Weeks
|LED RED DIFFUSED 0805 SMD
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|LG R971-KN-1
|OSRAM Opto Semiconductors Inc.
|475-1410-1-ND
|D2, D3
|D2, D3
|Cut Tape (CT)
|Active
|2
|0.25
|$0.50
|325681
|12 Weeks
|LED GREEN DIFFUSED 0805 SMD
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|MPZ2012S601AT000
|TDK Corporation
|445-2206-1-ND
|FB1, FB2
|FB1, FB2
|Cut Tape (CT)
|Active
|2
|0.11
|$0.22
|228257
|10 Weeks
|FERRITE BEAD 600 OHM 0805 1LN
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|105-1103-001
|Cinch Connectivity Solutions Johnson
|J577-ND
|J1-J12
|J1,J12
|Bulk
|Active
|2
|0.73
|$1.46
|15970
|7 Weeks
|CONN TIP JACK SOLDER BLACK
|RoHS Compliant
|Lead free
|Not Available
|-
|61300311121
|Würth Elektronik
|732-5316-ND
|J2,J6,J10
|J2,J6,J10
|Bag
|Active
|3
|0.13
|$0.39
|73107
|13 Weeks
|CONN HEADER VERT 3POS 2.54MM
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|105-1102-001
|Cinch Connectivity Solutions Johnson
|J576-ND
|J3,J11
|
|Bulk
|Active
|2
|1.05
|$2.10
|0
|7 Weeks
|CONN TIP JACK SOLDER RED
|RoHS Compliant
|Lead free
|Not Available
|-
|UJ2-MIBH-4-SMT-TR
|CUI Devices
|102-4006-1-ND
|J4
|J4
|Cut Tape (CT)
|Active
|1
|0.79
|$0.79
|47066
|11 Weeks
|CONN RCPT USB2.0 MICRO B SMD R/A
|RoHS Compliant
|Lead free
|Not Available
|-
|302-S101
|On Shore Technology Inc.
|ED1543-ND
|J7
|J7
|Bulk
|Active
|1
|0.28
|$0.28
|29961
|9 Weeks
|CONN HEADER VERT 10POS 2.54MM
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|PREC018DAAN-RC
|Sullins Connector Solutions
|S2012EC-18-ND
|J9
|J9
|Bag
|Active
|1
|0.69
|$0.69
|1395
|Not Available
|CONN HEADER VERT 36POS 2.54MM
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|61300211121
|Würth Elektronik
|732-5315-ND
|J13
|J13
|Bag
|Active
|1
|0.13
|$0.13
|127153
|13 Weeks
|CONN HEADER VERT 2POS 2.54MM
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|NPC02SXON-RC
|Sullins Connector Solutions
|S9341-ND
|JUMPER
|
|Bag
|Active
|4
|0.11
|$0.44
|209938
|5 Weeks
|CONN JUMPER SHORTING .100" GOLD
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|RC1206JR-070RL
|Yageo
|311-0.0ERCT-ND
|L1 - Replacement
|L1
|Cut Tape (CT)
|Active
|1
|0.1
|$0.10
|9627917
|24 Weeks
|RES SMD 0 OHM JUMPER 1/4W 1206
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|EBC20DRAS
|Sullins Connector Solutions
|S9672-ND
|J5
|J5
|Tray
|Active
|1
|6.9
|$6.90
|0
|3 Weeks
|CONN EDGE DUAL FMALE 40POS 0.100
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|CRG0805F27R
|TE Connectivity Passive Product
|A126357CT-ND
|
|R1,R2
|Cut Tape (CT)
|Active
|2
|0.1
|$0.20
|30073
|18 Weeks
|RES SMD 27 OHM 1% 1/8W 0805
|RoHS Compliant
|Lead free
|Not Available
|-
|CRGCQ0805F1K5
|TE Connectivity Passive Product
|A129751CT-ND
|
|R3
|Cut Tape (CT)
|Active
|2
|0.1
|$0.20
|46326
|21 Weeks
|CRGCQ 0805 1K5 1%
|RoHS Compliant
|Lead free
|Not Available
|-
|RC1005F103CS
|Samsung Electro-Mechanics
|1276-3431-1-ND
|
|R4
|Cut Tape (CT)
|Discontinued at Digi-Key
|2
|0.1
|$0.20
|8019
|Not Available
|RES SMD 10K OHM 1% 1/16W 0402
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|RC0805JR-07470RL
|Yageo
|311-470ARCT-ND
|
|R5
|Cut Tape (CT)
|Active
|2
|0.1
|$0.20
|823055
|24 Weeks
|RES SMD 470 OHM 5% 1/8W 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|RC0805FR-07470KL
|Yageo
|311-470KCRCT-ND
|
|R6
|Cut Tape (CT)
|Active
|2
|0.1
|$0.20
|665330
|24 Weeks
|RES SMD 470K OHM 1% 1/8W 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|ERJ-6ENF1373V
|Panasonic Electronic Components
|P137KCCT-ND
|
|R7
|Cut Tape (CT)
|Active
|2
|0.1
|$0.20
|95215
|11 Weeks
|RES SMD 137K OHM 1% 1/8W 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|RC0805FR-0754K9L
|Yageo
|311-54.9KCRCT-ND
|
|R8
|Cut Tape (CT)
|Active
|2
|0.1
|$0.20
|19069
|24 Weeks
|RES SMD 54.9K OHM 1% 1/8W 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|ERJ-6ENF1621V
|Panasonic Electronic Components
|P1.62KCCT-ND
|
|R9
|Cut Tape (CT)
|Active
|1
|0.1
|$0.10
|220523
|11 Weeks
|RES SMD 1.62K OHM 1% 1/8W 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|ERJ-6ENF1433V
|Panasonic Electronic Components
|P143KCCT-ND
|
|R10
|Cut Tape (CT)
|Active
|1
|0.1
|$0.10
|34393
|11 Weeks
|RES SMD 143K OHM 1% 1/8W 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|RC0805FR-07280RL
|Yageo
|311-280CRCT-ND
|
|R11
|Cut Tape (CT)
|Active
|2
|0.1
|$0.20
|180886
|24 Weeks
|RES SMD 280 OHM 1% 1/8W 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|RC0805FR-07909RL
|Yageo
|311-909CRCT-ND
|
|R12
|Cut Tape (CT)
|Active
|2
|0.1
|$0.20
|284632
|24 Weeks
|RES SMD 909 OHM 1% 1/8W 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|RC0805FR-071ML
|Yageo
|311-1.00MCRCT-ND
|
|R13
|Cut Tape (CT)
|Active
|2
|0.1
|$0.20
|2662481
|24 Weeks
|RES SMD 1M OHM 1% 1/8W 0805
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|-
|FT2232D-REEL
|FTDI, Future Technology Devices International Ltd
|768-1010-1-ND
|
|U1
|Cut Tape (CT)
|Active
|1
|6.99
|$6.99
|24630
|11 Weeks
|IC USB FS DUAL UART/FIFO 48-LQFP
|RoHS Compliant
|Lead free
|REACH Unaffected
|-
|TEC 2-1219WI
|Traco Power
|1951-1401-ND
|
|U2
|Tube
|Active
|1
|10.26
|$10.26
|13
|13 Weeks
|DC DC CONVERTER 9V 2W
|ROHS3 Compliant
|Lead free
|Not Available
|-
|CSTNR6M00GH5C000R0
|Murata Electronics
|490-18276-1-ND
|
|Y1
|Cut Tape (CT)
|Active
|1
|0.44
|$0.44
|7201
|11 Weeks
|CERAMIC RES 6.0000MHZ 39PF SMD
|ROHS3 Compliant
|Not Available
|Not Available
|-
|TPS25921ADR
|Texas Instruments
|296-40731-1-ND
|
|U3
|Cut Tape (CT)
|Active
|1
|1.45
|$1.45
|36658
|6 Weeks
|IC PWR MGR EFUSE 18V 8SOIC
|ROHS3 Compliant
|Lead free
|REACH Unaffected
|}
====Interface Description and Theory of Operation====
The LMS-6 interface PCB allows the LMS-6 to be powered, connect to USB to UART, and connect to an in circuit programmer through the card edge connector.
{| class="wikitable"
|+Power Jumper Settings
! rowspan="2" |Jumper Ref Des
! colspan="4" |Jumpered Pins
|-
!Battery
!USB 5V
!Banana Jacks Regulated (J1&J3)
!Direct Power (J11&J12)
|-
|J2
|X
|2,3
|1,2
|X
|-
|J6
|1,2
|2,3
|2,3
|2,3
|-
|J10
|X
|2,3
|2,3
|1,2
|}
[https://github.com/Reid-n0rc/LMS-6_Interface_Board/blob/main/LMS-6_Interface_Board_Rev_10.pdf LMS-6 Interface Board Schematic Rev 10]
=====Circuit Power Options=====
The LMS-6 Inteface board offers four power options to power LMS-6. Components for any of the power options can be omitted if they will be unused to reduce the build the build cost.
======Battery Power======
The LMS-6 can be powered using three CR123 lithium batteries connected to the LMS-6 onboard battery holders. Batter power is enabled by jumpering Pin 1 and Pin to of J6 together.
======USB 5V Power======
The LMS-6 can be powered from the J4 Micro USB B connection. This is enabled by jumpering Pin 2 and Pin 3 of J2; Pin 2 and Pin 3 of J6.
USB power is indicated by D2 Green LED
=====USB to UART=====
The LMS-6 interface includes a FT-2232 USB to UART. UART1 is connected to GPS. The default baud rate for the GPS is 38400 bps. UART 2 TX is connected to U3 pin 19 on the LMS-6.
If the connections are wrong, they can swapped using JP1,JP2 and JP4, JP5.
=====In Circuit Programming=====
=====eFuse=====
<br />
==Reference==
Here are some reference materials. This is an initial population of material, and this section will need significant cleanup - putting links up for now.
https://www.nws.noaa.gov/directives/010/pd01014001b.pdf - Rawinsonde Operations - some more technical data on radiosonde operations.
<br />
