17
edits
Changes
Jump to navigation
Jump to search
<br />
Added possible LD series LDO data sheet
*LED_R = PB12
====uBlox GPS(USART_2)====
*PA3(RX) = GPS TXD(Pin 2)*PA2(TX) = GPS RXD(Pin 3)*PB8 = GPS 1pps (Pin 4) (LED next to flex cable connector)
====UART via USB Port(USART_1)====
*PA9(TX) = USB D+
*PA10(RX) = USB D-
====Si4063(SPI_1)====
*PB2 = CS/nSEL(Pin 15)*PC3 - SDN (Pin 1)*PA7 = SDI(Pin 14)*PA6 = SDO(Pin 13)*PA5 = SCLK(Pin 12) '''NFC/RFID 4k EEPROM''' *PC13 = RF WIP/Busy (Pin 7)*PB6 = SCL (Pin 6)*PB7 (''needs confirmed, signal routes under STM)'' = SDA (Pin 5)
'''STG719 (DPST) - U2'''
* PC11 = IN(Pin 1)
'''STG719 (DPST) - U3'''
* PD2 = IN(Pin 1)
'''STG719 (DPST) - U4'''
* PB5 = IN(Pin 1)
'''STG719 (DPST) - U5'''
* PB4= IN(Pin 1)
'''DG636 (Dual DPST) - U6'''
* VDD = ENABLE (always HIGH) (Pin 2)* PA10 = A0(Pin 1)* ''UnknownPin#1'' (routes under STM) = A1(Pin 14)
'''STG719 (DPST) - U7'''
* ''UnknownPin#1'' (routes under STM) = IN(Pin 1)
'''SN74LV4053 (Triple 2Ch Mux/Demux) - U8'''
* PB13 & PB14 = A(Pin 11)** STM pins connected by trace** ? ''Why? Read back?'' * ''UnknownPin#1'' (routes under STM) = B (Pin 10) & C(Pin 9)** IC pins connected by trace '''Analog Inputs to STM2''' *PA0 - Vbatt/Power supply voltage (''needs confirmation)''*PB1 - Vbatt/Power supply current monitor (''needs confirmation)''
<br />
|STM32F100R8T6B
|ARM MCU, 24MHz, 8KB RAM, 64KB Flash
|LQFP48
|ARM 32F100R8T6B
|[https://www.mouser.com/datasheet/2/389/stm32f100cb-1851080.pdf Mouser]
|''Some recent batches of the DFM-17 have been using knockoff STM32s! The chip shortage strikes again!''
|-
|U2, U3, U4, U5, U7
|0.3 pC Charge Injection, 100 pA Leakage
CMOS ± 5 V / 5 V / 3 V Dual SPDT Analog Switch
|TSSOP14
|636EE
|[https://www.mouser.com/datasheet/2/427/dg636e-1766306.pdf Mouser]
|LMV761
|Low Voltage Precision Comparator with Push/Pull Output
|SOT-23-6
|C22A
|[https://www.ti.com/lit/ds/symlink/lmv762.pdf Texas Instruments]
|Si4063
|High Performance, Low Current Transmitter
|QFN20
|40632A
C01Q81
energy harvesting, I²C bus and ISO 15693 RF interface
|TSSOP8 (DW)UDFN8
|4BEB 8150
|[https://www.st.com/resource/en/datasheet/m24lr04e-r.pdf STMicroelectronics]
|''Needs verification. DFM-17 does not boot when removed; I suspect the serial and calibration is stored in the EEPROM here - Trevor229''
|-
|U13
|DFN6
|33R
|[https://www.mouser.com/datasheet/2/389/ld39050-1849494.pdf Possible part from Mouser]|''Needs verification, appears to provide 3.3V for GNSSregulated power''
|-
|U14
File:Label id speculaton.jpg|Possible meanings of the internal labels and values. The date code in particular which may be useful to date production times. NWS sondes have the same cryptic string printed on the outside of the sonde where the mfg. date normally is on other countries'. "TU" may just indicate the board comes with sensors according to a third party source<ref>https://sondehunt.de/language/en/archive/1189</ref>.
File:Sensor stalk pinout.jpg|Pinout of the DFM-17 sensor stalk. Not all pins are used, and some seemingly are connected to a trace but end abruptly.
File:V719 and others removed.jpg|V719 SOIC SOT-23-6 packages removed as well as 636EE (SPDT Switch) and LW053A (Mux/Demuxer)
File:Stalk pinout mapping.png|Mapping of the pins on the sensor stalk to the connector and their corresponding IC/IO lines. '''''<u>Top of sensor stalk corresponds to bottom of pictured connector!</u>'''''
File:Dfm back pcb no battery.jpg|Back of the DFM PCB without CR123A battery holders
==Hardware modifications==
====SMA Port to replace antenna& SWD header:====
The DFM-17 has solder pads for an SMA port and a SWD header. An [https://adafru.it/4048 Adafruit Skinny SWD SMT] connector and a generic SMA connected was used in the photo.
</gallery>
==Developing and Programming the board==
[[File:DFM-17 SWD Port pinout.png|thumb|A very crude diagram showing the standard SWD pinout overlaid onto the DFM-17 board]]
