Functional Description
MEN Mikro Elektronik GmbH
56
20BL50S00 E2 – 2014-12-10
3.10
Status and User LEDs
The BL50S provides two board status LEDs and four general status LEDs. One of
the status LEDs signals whether the onboard power generated by the BL50S’s on-
board DC/DC converter is within valid range, the other signals the system status.
The four user LEDs can be controlled via an I/O expander on the SMBus. The LEDs
can be used freely depending on an application’s requirements.
Figure 16.
Status and user LEDs on the BL50S’s front panel (highlighted in red)
The following table shows a list of all status and user LEDs with their functionality
or default state.
Table 15.
Status and user LEDs on the BL50S
See
Chapter 3.10.1 Status LED on page 57
for a detailed description of the Status
LED’s behavior.
See
Chapter 4.1 SMBus Overview
for information on how to access the LEDs.
Number
Description
Color
Function
1
Power good
green
on, when internal 12V active
2
Status LED
(diagnostic)
yellow
see
Chapter 3.10.1 Status
LED on page 57
3
User LED A
yellow
default: off
4
User LED B
yellow
default: off
5
User LED C
yellow
default: off
6
User LED D
yellow
default: off
