DA14531MOD

Final

Datasheet

Revision 3.1

31-May-2021

CFR0011-120-00

16 of 32

© 2021-2021 Dialog Semiconductor

6.2

Labeling

Figure 7: Reel Labeling

7

Application Information

•

The RST signal is shared with the MOSI input of the NOR flash. For this reason, RST must

not be driven to GND. When the internal Flash is in use, the reset functionality is not

available.

•

The SPI Bus of DA14531 is used for the communication of the SoC with the NOR Flash at

boot time. Three of the four signals are not driven to external module pins. For this reason, a

sensor that utilizes the SPI bus must be assigned (by software) on to the module pins to

communicate with after boot is completed and when NOR Flash is no longer in use. An

example is given in Figure 11.

PROJECT

NAME

DA14531

1Mbit

NOR

Flash

P0_0/RST

P0_1

P0_3

P0_4

P0_2

P0_5

P0_6

P0_7

P0_8

P0_9

P0_10

P0_11

VBAT

J12

J5

J13

J16

J15

J8

P25Q11U

MOSI

/CS

MISO

SCK

MOSI

/CS

MISO

SCK

J10

J14

J9

Sensor

DA14531 TINY Module

MCU

UTX

URX

GPIO

J1, J2, J3, J4, J6, J11

Figure 11: Example of Connecting a Sensor to the SPI Bus and an MCU to RST and UART

SPI FLASH.