Hardware and layout UM1574
28/48 Doc ID 023645 Rev 1
4.3.2 STM8AL board LEDs
The STM8AL board includes the following LEDs and their description is:
LD1 COM: LD1 default status is red. LD1 turns to green to indicate that communications are
in progress between the PC and the ST-LINK/V2.
LD2 PWR: red LED indicates that the board is powered and that 3.3 V is generated by the
regulator supplied by the L99PM62GXP power management IC.
User LD3: red LED is a user LED connected to the I/O PE7 of the STM8AL3L68T.
User LD4: green LED is a user LED connected to the I/O PC7 of the STM8AL3L68T.
4.3.3 STM8AL board Push buttons
The STM8AL board includes two push buttons:
● USER1: User button connected to the I/O PE1 of STM8AL3L68T.
● USER2: User button connected to the I/O PE2 of STM8AL3L68T.
4.3.4 STM8AL board built-in I
DD
measurement circuit
The STM8AL board built-in I
DD
measurement circuit allows the consumption of the
STM8AL3L68T to be measured and displayed on the LCD Glass while the MCU is in Run or
Low power saving modes.
● JP2 in ON position: STM8AL3L68T is powered through I
DD
measurement circuit
(default).
● JP2 in OFF position: STM8AL3L68T is powered directly by +3V3, I
DD
measurement
circuit is bypassed.
Note: When jumper JP2 is removed the current consumption of the STM8AL3L68T can be
measured by connecting an ammeter between jumper JP2 pin 1 and pin 2.
For I
DD
measurement by the MCU itself, the circuit below is implemented on the STM8AL
board. Solder bridges SB6, SB7 and SB8 must be closed and a jumper must be plugged
between JP2 pin 2 and pin 3.
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