Datasheet

 2016-2019 Microchip Technology Inc. DS50002519D-page 9
RN4678
2.5 Software Button (SW_BTN)
The Software Button (SW_BT) pin powers the main
sections of the module into operation. If the SW_BTN
pin is low, the module is turned OFF. After turning the
module ON via the SW_BTN, the host MCU must wait
for specific time before sending the first command. The
timing diagrams for the SW_BTN, other related pins,
and the time delay are required before the host MCU
sends the first command.
Figure 2-2 through Figure 2-4 show the timing
diagrams for the RN4678 with regard to the SW_BTN
and the other relevant pins in different states of the
module.
FIGURE 2-2: SW_BTN TIME (HIGH) AT APP MODE
(
1,2)
Note 1: Time duration (475 ms) is for reference purposes only. Use the Status Indication pins to verify the exact time
when the host MCU can start sending the commands.
2: Reset pin is not connected.
Note: By default, the SW_BTN functionality is
disabled and it can be enabled using the
Host MCU commands. Refer to the
RN4678 Command Reference User
Guide (DS50002506) for more details.
BAT_IN
MCU State
Power on
/Initial
Idle Power on
SW_BTN
LDO18_O
RST_N
P1_5
P0_4
MCU send UART command
(BT UART RX)
10 ms
40 ms
4 ms
UART
command
475 ms