BCM20730 Data Sheet
Infrared Learning
Infrared Learning
The BCM20730 includes hardware support for infrared learning. The hardware can detect both modulated and
unmodulated signals. For modulated signals, the BCM20730 can detect carrier frequencies between 10 kHz
and 500 kHz and the duration that the signal is present or absent. The BCM20730 firmware driver supports
further analysis and compression of learned signal. The learned signal can then be played back through the
BCM20730 IR TX subsystem. See Figure 3.
Figure 3: Infrared RX
Triac Control
The BCM20730 includes hardware support for zero-crossing detection and trigger control for up to four triacs.
The BCM20730 detects zero-crossing on the AC zero detection line and uses that to provide a pulse that is
offset from the zero-crossing. This allows the BCM20730 to be used in dimmer applications, as well as any other
applications that require a control signal that is offset from an input event.
Broadcom Proprietary Control Signaling and Triggered
Broadcom Fast Connect
Broadcom Proprietary Control Signaling (BPCS) and Triggered Broadcom Fast Connect (TBFC) are Broadcom-
proprietary baseband (ACL) suspension and low latency reconnection mechanisms that reestablish the
baseband connection with the peer controller that also supports BPCS/TBFC.
The BCM20730 uses BPCS primitives to allow a Human Interface Device (HID) to suspend all RF traffic after a
configurable idle period with no reportable activity. To conserve power, it can then enter one of its low power
states while still logically remaining connected at the L2CAP and HID layers with the peer device. When an
event requires the HID to deliver a report to the peer device, the BCM20730 uses the TBFC and BPCS
mechanisms to reestablish the baseband connection and can immediately resume L2CAP traffic, greatly
reducing latency between the event and delivery of the report to the peer device.
BROADCOM
®
September 9, 2013 • 20730-DS108-R
Page 15
BROADCOM CONFIDENTIAL
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