UM-B-114
DA14531 Development Kit Pro Hardware User Manual
User Manual
Revision 1.4
23-Apr-2020
30 of 82
© 2021 Dialog Semiconductor
5.3.4.1
Single-wire UART
●
DA14531-WLCSP17: use P0_3 for single-wire UART. It is supported from SmartSnippet Toolbox.
A wire bridge must be used on PRO-MB.
●
DA14531-FCGQFN24: use P0_5 for single-wire UART. it is supported from SmartSnippet
Toolbox. There is no need for bridge wire (
).
Table 8: Single-wire UART Pin Assignment
Function
The Signals
Comments
PRO-MB
DA14531 PRO-DB
Enabled by Jumper/Wire-Bridge
J2
FCGQFN24
WLCSP17
RxTx
Jumper: J1: 19-20
P2_5
P0_5
No need to disable SPI Data
Flash.
Jumper: J10:1-J1:15
Jumper: J10:2-J1:17
wire: J1:19 to J2:24
P2_3
P0_3
In order not to conflict with
MISO, disable SPI Data
Flash. Remove jumpers:
J1: 1-2/J1: 3-4/J1:5-6/J1:7-
8/J1:9-10
Jumper: J10:1-J1:15
Jumper: J10:2-J1:17
Figure 24: Single-wire UART for DA14531 WLCSP17 PRO-DB
5.3.4.2
2-wire UART Configuration
●
UTX and URX signals are multiplexed with FCS (chip select) and MISO of SPI data bus
●
Two wires are required to connect UTX and URX to DA14531 PRO-DBs
●
Disable SPI data flash by removing jumpers on J1
●
JTAG and Reset can be used