LTC4240 Datasheet | Linear Technology

LTC4240 pact PCI Hot Swap Controller with I2C patible Interface Features s s s DESCRIPTIO s s s s s s s s U APPLICATIO S s s Allows Safe Board Insertion and Removal from a Live pact PCITM Bus I2CTM patible 2-Wire Interface PRECHARGE Output Biases I/O Pins During Card Insertion and Extraction Controls 3.3V, 5V, 12V and - 12V Supplies Foldback Current Limit with Circuit Breaker LOCAL_PCI_RST# Logic On-Board Quick Switch® Enable Output Status LED Driver User Programmable Supply Voltage Power-Up Rate Registers Individual Supply Faults Available in a 28-Pin Narrow SSOP Package Hot Board Insertion into pact PCI Bus Electronic Circuit Breaker , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. Quick Switch is a registered trademark of Quality Semiconductor Corp. pact PCI is a trademark of the PCI Industrial puter Manufacturers Group. I2C is a trademark of Philips Electronics N.V. The LTC®4240 is a Hot Swap TM controller that allows a board to be safely inserted and removed from a live pact PCI bus slot. The LTC4240 has a built-in 2-wire I2C patible interface to allow software control and monitoring of device function and power supply status. Two external N-channel transistors control the 3.3V and 5V supplies, while two internal switches control the - 12V and 12V supplies. Electronic circuit breakers protect all four supplies against overcurrent faults. The PWRGD output indicates when all of the supply voltages are within tolerance. The OFF/ON pin is used to cycle the board power or reset the circuit breaker. The I2C interface allows the user to turn the device off or on, set RESETOUT, turn on the status LED driver and ignore 12V, - 12V faults. It also allows the user to read the status of the FAULT, RESETIN, RESETOUT, PWRGD, PRSNT1# and PRSNT2# pins. Under a fault condition, the I2C interface can also be used to determine which of the four supplies generated the fault....