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© NXP B.V. 2011. All rights reserved.

Report

Rev. 1 — 20 December 2011

5 of 10

NXP Semiconductors

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Smart lighting: a bright idea whose time has come

3.

The GreenChip approach

A new smart lighting chip set from NXP Semiconductors, called GreenChip, creates a

wireless connection between the light bulb and a TCP/IP network. As shown in Figure 2,

the GreenChip solution includes a CFL or SSL driver, a standby power supply, and

hardware for wireless connectivity.

The dimmable SSL210x driver family, designed for SSL lamps, can provide up to 94 %

energy efficiency. It works with a number of LED supply topologies, including isolated

flyback, non-isolated buck-boost configurations, and antenna isolation as an option. The

dimmable UBA2027x, for CFL lamps, is a combination driver and controller that

addresses consumer complaints about CFLs. In particular, it provides deep dimming

capabilities similar to those of incandescent lamps, includes a "boost" function that

reduces the time from start-up to full light output, and extends lamp lifetimes to over

15,000 hours and up to 100,000 on/off switching cycles.

The JN514x wireless IC is a low-power combination of an RF transceiver and a dedicated

32-bit RISC CPU. It operates at a frequency of 2.4 GHz. Because of its short wavelength,

this frequency allows effective radiation from metal luminaires that usually surround the

lamps. The effective range of the system is increased compared to sub-GHz alternatives.

A software option on the JN514x provides capacitive touch key sensing functionality,

enabling cap-touch remote controls without requiring any additional ICs. Table 1 shows an

overview of the iCFL and iSSL reference designs available to support the most common

lamp types and supply topologies.

Fig 2.

The NXP GreenChip platform for smart lighting

Table 1.

iCFL and iSSL smart lighting reference designs

CFL

LED

Non-isolated LEDs and

antenna A19, BRx, PARx

Isolated LEDs and

non-isolated antenna

A19, BRx, PARx

Isolated LEDs and

isolated antenna TLED,

A19, BRx, PARx

PWM

dimming

-

SSL2108 buck;

TEA1721; JN514x

--

Analog

dimming

UBA2027x flyback;

TEA1721; JN514x

SSL2101 buck-boost;

TEA1721; JN514x

SSL2101 flyback;

TEA1721; JN514x

TEA1733 flyback;

TEA1721; JN514x