R_10018 Datasheet, PDF (7/10 Pages) NXP Semiconductors – Smart lighting A bright idea whose time has come

NXP Semiconductors
R_10018
Smart lighting: a bright idea whose time has come
The GreenChip platform reduces power consumption, in active and standby modes, in
several ways. First, the hardware for wireless connectivity is highly efficient. The JN5148
version, for example, consumes less than 17 mA when active. The sleep current of just
100 nA supports coin battery lifetimes of more than 10 years. The IC can also be used
with energy-harvesting switches, which make batteries unnecessary, and in remote
controls with capacitive key sensing.
The GreenChip solution includes a dedicated IC for standby power to minimize power
consumption in standby mode. The TEA1721 is a buck converter that offers a no-load
capacity of less than 10 mW. In standby mode, when configured with a standard ZigBee
software stack, the entire GreenChip solution consumes roughly 140 mW. The standby
power consumption can be reduced to below 50 mW by using a low-power routing option,
in the JenNet-IP stack, that duty cycles the radio chip. Either way, the impact of standby
power consumption is negligible in a network based on the GreenChip platform.
3.2 IP-based stack
The GreenChip platform supports the use of any software stack based on IEEE 802.15.4,
including ZigBee for the network layer. However, the full power-saving potential of the
platform (that is, the standby power option of just 50 mW) and IP connectivity are only
available with the JenNet-IP network stack, a 6LoWPAN mesh-under tree network, also
based on IEEE 802.15.4, that specifically targets low-power operation in residential and
industrial applications. Figure 4 shows a smart lighting network based on JenNet-IP.
Fig 4. JenNet-IP based smart lighting network
JenNet-IP commands are relayed from device to device using IPv6 packets. That means
that, for example, a smartphone can communicate with a bulb without converting IP to
ZigBee. There is no need for protocol conversion because the network provides
end-to-end IP connectivity. This enhances network security and makes communications
more reliable. It also reduces the cost of any gateways that tunnel commands from the
Ethernet port of a router through an 802.15.4 radio into the wireless network. This is
because the software required for the Ethernet-to-802.15.4 bridge can be implemented
using the 32-bit microcontroller already embedded in the radio IC. There is no need for a
separate, dedicated controller to manage the interaction between the Ethernet and
802.15.4 protocols.
R_10018
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All information provided in this document is subject to legal disclaimers.
Rev. 1 — 20 December 2011
© NXP B.V. 2011. All rights reserved.
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