Folsom, Calif.—Akros Silicon Inc. has developed the AS1135 Powered Device (PD)
controller that implements the 2-Event Physical Layer Classification functionality of the
IEEE 802.3at standard (Draft 2.0).
This upcoming PoE standard raises the maximum available PD input power to 30W from the previously specified level of 13W in the existing 802.3af standard. The 30W power level opens up a range of new applications for PoE, including IP security cameras with Power, Tilt and Zoom (PTZ) capability, new multi-radio 802.11n wireless
access points, WiMax Customer Premise Equipment, SOHO Ethernet switches, thin clients and LCD displays.
The 2-Event Classification allows the AS1135 to recognize whether it is connected to a Type 1 (802.3af/13W) or Type 2 (802.3at/30W) Power Sourcing Equipment (PSE), and vice-versa. The 2-event Classification informs the IEEE 802.3at compliant PSE that it is safe to increase power delivered to the PD from 13W to 30W. Use of this classification protocol between Type 2 PSE and Type 2 PD enables dynamic negotiation and allocation of power, leading to more efficient system power management.
Akros Silicon has also completed testing the interoperability of the AS1135 PD controller with Microsemi's recently released PD64001 PSE Power Manager, in accordance with the IEEE 802.3at-Draft2.0 standard, allowing customers to effortlessly implement both ends of the PoE link (both PSE and PD).
For more on the PD64001, click here.
The AS1135 controller is an extension of Akros' AS1100 family, supporting many new features in the same small 5x5 20pin QFN package. The part provides "AT Detect" functionality on a logic output pin, indicating successful PoE connection to Type 2 PSE. This hardware feature can be used by the system micro-controller to self-configure the networked appliance based on the power delivery capability of the network. The AS1135 is also capable of operating with local power input as low as 10V.
Another feature is the capability to externally set the switching frequency of the integrated DC-DC controller in the 100kHz to 500kHz range. This gives designers added flexibility to optimize the system for parameters like EMI, power consumption and component sizes.
Pricing: $1.66 for 1,000-unit quantities.
Availability: Now.
Product brief: Click here.
Akros Silicon, www.AkrosSilicon.com
