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I2C hot-swap controller aims for high-availability

Posted: 10 Aug 2010 ?? ?Print Version ?Bookmark and Share

Keywords:hot swap controller? ADC? LED drivers?


Maxim Integrated Products debuts a single-channel hot-swap controller for 0 to 16V backplanes. The MAX5978 allows line cards to be safely inserted and removed from a live backplane without causing glitches on the system power-supply rail. It integrates a 10-bit ADC for monitoring voltages and currents, allowing system designers to monitor power consumption and system reliability. Targeted applications include networking, base station, storage, and computer server line cards.

The integrated 10-bit ADC and I2C-compatible interface provide precise monitoring of currents, voltages, and fault conditions in hot-swappable line cards. Plus, the MAX5978 integrates volatile memory containing two circular buffers that store 5ms of past current and voltage measurements. The buffers can be read back through the I2C interface at anytime or after a fault has occurred. Buffer data can be used by the system to determine if a line card is using its allocated power or operating abnormally, thereby improving overall system reliability.

Rated for 0V to 16V inputs, the controller can withstand transients or inductive spikes up to 30V. It provides controlled inrush current at startup and two levels of overcurrent protection after startup. It also includes five digital comparators per hot-swap channel to provide overcurrent warning, two levels of overvoltage detection, and two levels of undervoltage detection. Four I/Os can be independently configured as GPIOs or as open-drain LED drivers with programmable blanking. Other features include alert outputs to indicate undervoltage, overvoltage, and overcurrent faults. This controller can be configured for latched-off or autoretry fault management.

The MAX5978 is available in a 5mm x 5mm, 32-pin TQFN-EP package, and is fully specified for operation over the -40C to +85C extended temperature range. Prices start at $3.15 for orders of at least 1,000 units, FOB US.

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