2
edits
Changes
m
<br />
Add note about wire colors when splicing a USB cable
*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)*PD0 = GPIO2 (Pin 19)*PA4 = GPIO3 (Pin 20) '''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)'' '''Battery Management IC''' * PC0 - Hold high to prevent BMS from removing battery power after boot up
<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
|U10
|Silicon Labs
|Si4063-C2A
|High Performance, Low Current Transmitter
|QFN20
|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
*VBUS: 5 Volts DC
*D-(typically white): TX*D+(typically green): RX
*GND: GND
==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]]