User's Manual l MBLS1028A UM 0100 l © 2020, TQ-Systems GmbH
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4.4.2
Status LEDs
Two green LEDs (V55, V56) are provided on the MBLS1028A for tests. They are controlled by IO1_5 and IO1_6 of the 16-port
I
2
C expander PCA9538, D69, see Table 5.
The presence of all important supply voltages is indicated by green LEDs. They light up when the corresponding voltage is active
and simplify developing with the MBLS1028A. The following supply voltages are indicated by green LEDs:
Table 22:
Supply voltages LEDs
Voltage
LED
V_24V
V72
V_12V
V71
V_5V0
V73
V_3V3
V74
V_3V3S
V70
V_2V5
V84
V_1V8
V75
V_1V5
V76
V_1V1
V77
V_1V0
V78
4.4.3
Buzzer
For acoustic signalling of events, a signal generator is provided on the MBLS1028A.
It is controlled by IO1_7 of the 16-port I
2
C expander PCA9538, D69, see Table 5.
4.4.4
Reset Push button
A reset button (S7) is provided on the MBLS1028A.
4.4.5
User push button
Two push buttons (S4, S5) are provided on the MBLS1028A.
The push button status can be read at the 16-port I
2
C expander PCA9538, D69, see Table 5.
4.4.6
DIP switches
Two 4-fold DIP switches (S9, S10) are provided on the MBLS1028A. The function of DIP switch S9 is described in Table 3.
With DIP switch S10 the SPI, IIC5, UART2, and VCC_FAN signals on the MBLS1028A can be toggled between two destinations.
The four individual switches switch to Ground and have 4.7 kΩ PU to 3.3 V.
The following table shows the functions of DIP switch S10.
Table 23:
Function DIP switch, S10
Switch
Position
Function
Remark
1~2
Open
I2C5 switched to MikroBUS™
4.7 kΩ PU to 3.3 V
Closed
I2C5 switched to I2C5_MUX_A or I2C5_MUX_B on MBLS1028A
3~4
Open
UART2 switched to MikroBUS™
4.7 kΩ PU to 3.3 V
Closed
UART2 switched to UART2_MUX_A or UART2_MUX_B on MBLS1028A
5~6
Open
SPI3 switched to MikroBUS™
4.7 kΩ PU to 3.3 V
Closed
SPI3 switched to header X25
7~8
Open
Fan on
4.7 kΩ PU to 3.3 V
Closed
Fan off