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The following pinout is used in the RapidHA Lighting firmware. The Z357PA40 module pad numbers are shown in brackets:
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| Z357PA40 Module Pad | EM357 Pin | Function |
|---|---|---|
| 5 | PB3 | Relay Out |
| 6 | PB4 | PWM Out |
| 9 | PA5* | Network LED |
| 15 | PB2 | Zigbee Serial RX |
| 16 | PA6 | Button |
| 17 | PB1 | Zigbee 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
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The following pins can be used for serial communication with a Host microcontroller:
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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.
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