6. The DA14531 Hardware

The DA14531 Pro Development Kit DA14531 ProDev Kit consists of a DA145xx DEVKT-P PRO motherboard and a DA14531-00 daughterboard featuring the DA14531 SoC of the desired package WLCSP17 or QFN24.

6.1. The ProDev Kit Motherboard

Figure 3 shows the physical layout of the ProDev Kit motherboard Rev B combined with the FCGQNFN daughterboard.

Figure 7 shows the DA14531 ProDK combined with the the DA14531-00 daughterboard.


The DA14531-01 daughterboard is the same as the DA14531-00.

The ProDev Kit motherboard provides the necessary hardware to enable:

  • Full digital connectivity with external hardware using UART, SPI, GPIO, and I2C

  • USB-based debugging capabilities using the SEGGER J-Link on-board debugger

  • USB-based UART communication with the host PC using a Future Technology Devices International (FTDI) chipset that converts UART to USB signal


Figure 3 The DA14531 ProDev Kit Motherboard

6.2. The DA14531 Pro Kit Daughterboard

Figure 4 shows the DA14531 daughterboard.


Figure 4 The DA14531 Daughterboard


The DA14531 daughterboard comes with a default resistors (R-Multiplexer) configuration. This is a group of 16 resistors of 0 Ω that can be placed/removed as needed in order to hardwire various peripherals to the DA14531 pins (From J1 or J2 ) as desired.


SW1 is the Power mode selection switch. It is a power switch of three positions: (1) Position H (Buck), (2) Position B (Bypass), (3) Position L (Boost). SW1 must be set to position H (Buck) (see Figure 4) and the selection on the motherboard should be done on J4 (see Figure 5).


Application Note AN-B-073 contains guidelines to implement a RFIO filter that serves to reduce conducted and radiated spurious emissions in Bluetooth low energy applications.

6.3. Configure the Pro Kit Board with Jumper Settings

The needed jumper settings for this getting started are displayed in Figure 5:


Figure 5 DA14531 Jumper Setting

Table 2 DA14531 Mother Board Main Elements




Configuration header. SPI data flash, UART modes, JTAG and Reset functions are enabled


Break out header


Enable LED and the triggering function of Smart Snippet power profiler. LED J8:3-4 and C_TRIG J8:1-2


Enable user push buttons SW2 and SW3


Enable current sense circuit. Jumpers installed by default. See Table 16 in the UM-B-114 DA14531 Devkit Pro Hardware User Manual


VLDO output voltage selection


DCDC Configuration: selects either Boost, Buck, or Bypass mode


On the J2 Break out header (see Figure 5) all signals of the PRO-DBs are provided. The signal names are specific for the PRO-MB and they do not have the same name as the signals of the PRO-DBs (for example, P20 corresponds to P00). The reason is that DA145xx Motherboard can be used for the DA1431 SoC and the DA1458x family of SoCs. DA14531 SoC has less pins than the DA1458x SoCs.

Figure 6 shows the layout of the header jumper J1.


Figure 6 Jumper J1 Layout

6.4. Board Layout

The layout of the boards is displayed in Figure 7.


Figure 7 DA14531 Board Layout


The schematic diagrams, BOM, and Gerber files are illustrated in detail in the Development Kit Documentation.

6.5. Connecting the ProDev Kit to the host PC

The ProDev Kit motherboard includes the FTDI chipset U12 FT2232HL, which allows easy communication with the development host over USB. The FT2232HL implements the USB to UART function, and ensures the connectivity of the PC to the DA14531 SoC UART port, and to current sense circuitry through SPI connection with ADC U8.

The chip is supplied with 3.3 V from U5. A 12 MHz crystal Y1 is required for the chip to operate.

The ProDev Kit motherboard also includes an embedded J-Link debugger U4 SAM3U2CA. The chip is supplied with 3.3 V at U5 which is enabled by PWR_ENABLE signal.

Before connecting the ProDev Kit to the host PC, make sure that the motherboard and the desired daughterboard module are properly connected.

Choose between 3.3 V (via USB: USB1) or VDD (a coin cell). There is no battery needed when a mini-USB cable is used.

Attach a standard mini-USB cable to the connector marked as USB1 (see Figure 8) to connect the ProDK Development Kit to the host PC.


Figure 8 ProDK Development Kit Connections


  • The ProDev Kit is connected with a standard mini-USB cable to the host PC from a connector marked as USB1 (see Figure 7).

  • To install a battery on the daughterboard, remove Jumper J9:1-2 and apply Jumper J9:3-4. Section 6 in the UM-B-114 DA14531 Devkit Pro Hardware User Manual shows how to configure power for the DA14531 DK PRO.