Integration overview¶
This section provides a top level view of the complete process of integrating the W-DALI Node module into a product.
Block diagram¶
A typical OEM integration may look like the block diagram below. The base OEM product has a IEC 62386-interface to which the LumenRadio W-DALI OEM module is connected together with some limited external circuitry for DALI interface and power supply. By introducing the W-DALI module, the external DALI-2 port and related protection circuitry may be removed to obtain a pure W-DALI device. Note that an internal DALI PSU is needed in this case. Optionally, the external DALI-2 port may be kept which will allow for connection of up to 9 additional DALI-2 units on a local bus, all kept individually adressable from the DALI-2 controller connected to the W-DALI Root.
Step by step¶
Given a base product with an existing DALI-2-interface, the replacement of the external DALI terminal interface with the LumenRadio W-DALI module could include the following steps:
- Provide a suitable 3.3 V power supply. See section
Power supply recommendationsfor details. - Provide interface circuitry between W-DALI module and IEC 62386 bus of host product. See typical application circuits section for details.
- Decide between internal and external PSU
- Decide if to keep external DALI terminal
- Integrate the W-DALI module on a host PCB. See Layout considerations for details.
- Perform compliance testing for market access
Power supply recommendations¶
The W-DALI Module is designed for 3.3 V operation. All pins should not have any power applied to them before the +3.3 V rail is applied.
To ensure reliable operation, the supply pin should be decoupled with a 100nF ceramic capacitor close to the supply pin. It is also recommended to add a high value ceramic bulk capacitor, such as 47uF, which will reduce the current ripple of the 3.3 V net.
During radio transmission, current consumption will rise sharply to 150 mA typical, 250 mA max. A typical slew rate value is 300 A/s during radio transmission.
| Symbol | Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| VDD | Supply voltage | 3.0 | 3.3 | 3.6 | V |
| Vrise | Supply rise time (0 V to 3.7 V) | 60 | ms | ||
| IDD | Supply peak current capability | 150 | 250 | mA | |
| IDD_rate | Supply current slew rate | 300 | A/s |
Common mistakes¶
The integration of the W-DALI Node module is straightforward, but for optimal RF performance it is important to follow the power supply recommendations and layout considerations. Failure to do so may result in inferior RF performance. Some important highlights to avoid the most common mistakes are shown below:
- The carrier PCB shall be of the recommended type and have a proper ground plane
- Product enclosure and carrier PCB shall adhere to the clearance recommendations
- Product enclosure shall not block radio-signals
- Power supply pins shall have sufficient decoupling