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Pinout and Hardware Design Notes

The following pinout is used in the RapidHA Lighting firmware. The Z357PA40 module pad numbers are shown in brackets:

Z357PA40 Module PadEM357 PinFunction
5PB3Relay Out
6PB4PWM Out
9PA5*Network LED
15PB2Zigbee Serial RX
16PA6Button
17PB1Zigbee Serial TX

*A transistor circuit is required to ensure that this pin is held high at startup. This pin assignment will be changing. See the note below for more information.

PA5 Protection Circuit

Pin PA5 on the EM357 has a built-in function defined by Silicon Labs; if it is held low at startup, the EM357 will enter bootload mode.  MMB is in the process of updating the pinout to use a different pin that is available on our new Z357PA40 module. Until the new firmware implementing a different pinout is released, it is necessary to add the “protection circuit” shown below. R1 and R2 must have the same resistance.


For more information about how to integrate the Z357PA40 module in your lighting product design, see the Hardware Design Resources page.

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