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3.2 Operating Conditions
According to the powering method described in section 3.1, the input voltage supply must
follow the table below.
Parameter
Symbol
Condition
Min
Typical
Max
Unit
+5
P5V
Supply from J4 (P5V pin)
-
5
-
V
+3.3
P3V3
Supply from J4 (P3V3 Pin)
OR banana plug U13
3.0
3.3
3.6
Table 1: Voltage Operating Conditions
3.3 LED Indicators
The ML4019-MCB includes on-board LEDs, for quick debugging and monitoring purposes. LEDs
are summarized below:
LED D1 indicates whether a USB cable is plugged or not.
LEDs D2 and D5, colored green and red, respectively, are used for diagnostic purposes:
If D2 is on: USB is locked and device is recognized by the USB driver
If D5 is on: USB is not connected or USB driver is not found
If both are off: board is not powered correctly or firmware is corrupted
If both are blinking: the board is in Bootloader mode
3.4 Low Speed Signals
3.4.1 External I2C
The I2C bus can be accessed externally using U7 pins. In this case a jumper should be
placed on pin header P1 (HW_I2C) shown in the image below.
Figure 1: On-board LEDs
