User's Manual l MBa57xx UM 0100 l © 2020, TQ-Systems GmbH
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4.3.2
Push buttons
Three push buttons S10, S11, and S12, are connected to a port expander PCA9555PW on the MBa57xx.
The port expander is interrupt-capable by signal GPIO2_2_P4#.
Illustration 24:
Block diagram push buttons
4.3.3
Buzzer
Illustration 25:
Block diagram buzzer
The MBa57xx provides a buzzer. The buzzer can be activated by GPIO6_19_B26 (X2-69) of the TQMa57xx,
or by IO0_0 from Port Expander II, D23, see Table 11. A high level activates the buzzer.
4.3.4
Power-On and Reset push button
For further information about Power-On (S9) and Reset push button (S8), see chapter 4.1.6.
4.3.5
CAN and RS-485 termination
For further information about CAN (S3, S7) and RS-485 termination (S5), see chapter 4.2.5 and 4.2.6.