Smart proximity sensor manages SAR exposure in connected devices
Specific Absorption Rate (SAR) is the measure of RF power that is radiated into the human body when in close proximity to a connected device. Aimed at the increasing demands of more powerful radios in today’s mobile devices and to comply with the more stringent worldwide safety regulation, Semtech’s SX9310 smart sensor enables smartphone and tablet manufacturers to selectively reduce the RF power when in close proximity to the human body and protects its user from potentially harmful RF exposure. The solution also maintains optimum network connectivity and throughput in other normal usage situations.
“Semtech offers a unique smart sensor solution targeting specifically SAR proximity applications,” said David Wong, Senior Director for Semtech’s Wireless and Sensing Products Group. “The new sensing solution provides best in-class sensitivity for optimal human presence detection enabling mobile manufacturers to comply with worldwide SAR regulation without otherwise compromising RF system performance.”
Features of the SX9310
– On-chip smart engine for human detection and advanced Specific Absorption Rate (SAR) control
– Capacitance offset compensation up to 100 pF
– Integrated RF shield for enhanced immunity
– Low temperature drift for stable measurement
– Up to three channels high-performance capacitive sensing inputs
– Combined proximity mode to minimize the total sensor area
– Footprint of 1.35 x 1.32 mm in WLCSP
– Low power consumption from 2.7V – 5.5V input supply voltage
– 1.65V – 5.5V I2C interface
The SX9310 is priced at $1.14 (100-1,000).
Semtech; www.semtech.com
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