Product Card

EULUM DESIGN LLC 6131 • Kellers Church Road • Pipersville • PA • 18947 • USA
EULUM DESIGN LTD Unit 4 • Zone D •Chelmsford Road Ind. Est • Dunmow • CM6 1XG • UK
www.eulum.com
[e-mail]
UK: [phone]
USA: [phone]
RFM-CSB-3
The RFM-CSB-3 can be configured to detect the zero crossing point of an AC signal. This is
necessary to take advantage of Casambi’s “Smart Switching” feature. This looks for a pattern
of on-off cycles (quickly switching AC source on & off) in order to implement specific modes or
settings.
For proper Smart Switch operation, local VCC of the module must be kept alive during loss of
AC for 1.5 seconds. A 1200uf cap on VCC is typically recommended.
It is the responsibility of the host system designer to create the zero detection circuit and it’s
output needs to be compatible with logic level inputs of the RFM- CSB-1 (see specifications
section). ZD polarity and phase are adjustable in the Casambi admin webpages.
If Smart switching is not required, it is suggested to configure the ZD input for online/
offline detection. This allows the module to notify the network when it goes offline. This
reduces network bandwidth as it will not be repeatedly polling for a device that is no longer
responding. Local VCC must be kept alive for at least 500ms to support this feature.
ZERO DETECT CHARACTERISTICS MIN TYPICAL MAX UNITS
Hz
ms
ms
20
20
60
1
1
ZERO DETECT FREQUENCY, FMAINS
ZERO DETECT HIGH TIME, TZD_H
ZERO DETECT LOW TIME, TZD_L
4. ZERO CROSS DETECTION (ZD)
Zero Detect
tZD_LtZD_H
1/f MAINS