User Manual

Advanc
e
Information

2015 Microchip Technology Inc.
page
7
BM78SPPS5MC2 , RN4678
TABLE 1‐1: PIN DESCRIPTION
S5
pin
03
pin
Symbol Type Description
1 -- GND Power Ground reference
2
--
GND
Power
Ground reference
3 1 GND Power Ground reference
4 2 BAT_IN Power Battery Input. Main positive supply input.
Connect to 10
uF
(X5R/X7R)
capacitor.
5 3 SW_BTN DI Software Button H: Power On / L: Power Off
6 4 LDO33_O Power Internal 3.3V LDO regulator output.
Connect to 10
uF
(X5R/X7R)
capacitor.
7 5 VDD_IO Power
I/O positive supply input.
Ensure VDD_IO and MCU I/O voltages are compatible.
8 6 LDO18_O Power Internal 1.8V LDO regulator output.
Connect to 10uF (X5R/X7R) capacitor.
9 7 WAKEUP DI Wakeup from shutdown mode (active low)
(internal pull-up)
10 8 PMULDO_O Power Power management unit output.
Connect to 1
uF
(X5R/X7R)
capacitor.
11 9 P0_4 DO UART_TX_IND:
H: BM78 indicate UART data will be transmitted out
after certain timing.
(Setting by UI@ “MCU setting”, default wait 5ms)*1
L: Otherwise.
STATUS_IND_2:
BM78
State indication , refer to P1
_
5
12 10 P1_5 DO STATUS_IND:
B
luetooth link status indication
13
11
P1
_
2/SCL
DO
I2C SCL (Do Not Connect)
14
12
P1
_
3/SDA
DIO
I2C SDA (Do Not Connect)
15 13 P1_7/CTS DIO Configurable Control or Indication pin or
UART CTS (input)
16
14
P0
_
5
DIO
Configurable Control or Indication pin
17 15 P0_0/RTS DIO Configurable Control or Indication pin or
UART RTS (output)
18
16
P2
_
0
DI
System configuration (internal pull-up)
19 17 P2_4 DI System configuration (internal pull-up)
20
18
EAN
DI
System configuration (internal pull-down)
21 19 RST_N DI Module reset (active low) (internal pull-up)
Apply a pulse of at least 63 ns.
22
20
RXD
DI
UART data input
23
21
TXD
DO
UART data output
24 22 P3_1 DIO Configurable Control or Indication pin
(when configured as input: internal pull-up)
25 23 P3_2 DIO Configurable Control or Indication pin
(when configured as input: internal pull-up)