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<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 />
|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
|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
==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.
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==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]]
