SMSC offers power management chip for MOST devices
August 6, 2009 – SMSC has introduced the MPM85000, a single-chip solution for power management of Media Oriented Systems Transport (MOST®) devices. The firm said the chip combines all necessary peripheral functions to implement a MOST network interface, including diagnostics, status monitoring, and power supply. As such it eliminates the need for several discrete components.
Housed in a 4x4mm², 24-pin QFN, the MPM85000 can be used for all MOST speed grades and electrical (ePHY) or optical (oPHY) physical layers. An internal 3.3V regulator supplies power to the fiber-optical receiver (FOR) for plastic-fiber-based oPHY interfaces.
In sleep-mode the MPM85000’s current can be reduced to 30uA, which helps lower overall power consumption within a car. Monitoring logic detects switch-to-power and wake-up events and observes temperature at up to three configurable voltage levels. All operational states are reported to the MOST Intelligent Network Interface Controller (INIC) and to an external host controller (EHC).
An integrated diagnostic LIN transceiver supports ring-break diagnosis, wake-up, and diagnostics communication according to the Electrical Control Line specification (ECL). An internal power-on-reset generator allows a save power up for the INIC, the EHC and, if used in MOST25 and MOST150 networks, also for the fiber optic transmitter (FOT). Implemented in MOST50 devices, the MPM85000 supports network activity detection on the ePHY interface for wake-up via the MOST network.
The MPM85000 focuses on MOST-specific power management and does not include specific application power supply functionality. This makes it generically usable across all kinds of devices, from small node setups such as amplifiers to complex head units, independent from their specific power supply requirements regarding voltage and power.
“The MPM85000 offers a highly integrated power management solution for the infotainment network within the car,” said Stefan Lux, Product Manager for SMSC’s Automotive Information Systems product line. “Through a single-chip solution, designers of infotainment systems benefit from board space savings, shorter development times and lower cost regardless of the MOST device configuration. The end result provides designers’ an efficient, yet more robust system compared to a solution built solely on discrete components.”
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