User's Manual

24
RB540MB Development Board Figure
& Functional Descriptions
The RB540MB Development PCB has white silkscreen legend or reference designations located by
the switches and connectors described below.
Switches
Functional Description
PSW1
Power Toggle Switch: This switch controls the power to the RB5
4
0HM module that is
mounted on the RB540MB board. To remove the RB540HM, turn off PSW1.
USB1
USB
-
B Jack Power Source: The development board is power
ed through this USB
interface. When USB power is applied to the RB540MB Development Board, LED 102
will be ON. To turn the power on to the RB540HM, turn on the PSW1 Power Switch.
MIC1A
Stereo Jack Microphone input: Plug in for microphone when using for ha
nd free
phone or headset device.
SPK1
Stereo output Jack: Plug in external speaker to hear audio.
SW4
Pairing / Battery Check
(optional)
Button
a. Pairing function: see each application firmware operations.
b. Battery check function (optional): As soon as this button is pressed, battery
power level will be indicated by amount of LED light up
1 LED ≥ 3.2V, < 3.4V
2 LEDs ≥ 3.4V, < 3.6V
3 LEDs ≥ 3.6V, < 3.8V
4 LEDs ≥ 3.8V
SW3
Call Pick Up / END button
SW2
Volume up button
SW1
Volume down button
JP1
SPI Conne
ction: Use for uploading new firmware and debugging.
BATT1
Battery Input: provide power by battery when not using USB
-
B input power. Do Not
connect both power sources at the same time.
SP
-
L
Left Channel Speaker: directly connect to 4 ohm speaker
.
SP
-
R
R
ight Channel Speaker: directly connect to 4 ohm speaker.
LED 1
–
4
Paring and Battery LEDs.
PSW1
USB1
MIC1A
SPK1
JP1
BATT1
SP-L
SP-R
LED1
L
ED2
LED3
LED4