SPRUJC0 June 2024
The LaunchPad has the ability to connect to two independent linear or rotary encoders through the F28P55x on-chip eQEP interfaces; header J12 is connected to eQEP1 and header J13 is connected to eQEP3. By default, this connection is not active and the GPIOs are routed to the BoosterPack connectors. The 5V eQEP input signals from the J12 and J13 connectors are stepped down through a TI SN74LVC8T245 level translator (U13) to 3.3V. The eQEP1 signals are connected to J12 header by default. The eQEP3 signals are routed through TI SN74LV4053A triple 2-channel analog multiplexer/demultiplexer IC (U11). Switch S5 controls the select inputs of the IC to configure the eQEP3 signal destinations to be either the J13 connectors or BoosterPack headers, as described below in Table 3-6.
QEP3 SEL | QEP1 Signals (GPIO40/41/59) | QEP3 Signals (GPIO25/26/30) |
---|---|---|
0 (down) | J12 | J13 |
1 (up) | J12 | BP Headers |