PC87431S  Product Folder

The National Semiconductor® PC87431x family of mini-Baseboard Management Controllers (mBMC) is a light version of the IPMI v1.5. It is targeted for a wide range of remote-controlled platforms such as servers, workstations, hubs and printers.

The PC87431x incorporates an embedded microcontroller, three System Management Bus (SMBus®) interfaces, a Chassis Management interface, Bi-color LED control, an integrated flash, Fan control, 12 ADC channels, and Digital Input Event and General-Purpose Output pins.

The PC87431x interfaces with the host via a slave SMBus interface; it interfaces with the LAN On Motherboard (LOM) and with peripherals via two independent master SMBus interfaces.

The PC87431x also supports distributed management architecture via the Intelligent Platform Management Bus (IPMB).

In addition, the PC87431x includes an inhibit strap to enable the system to work with the daughter board of an advanced BMC.

The PC87431x, like members of National's Advanced I/O family, is PC01 and ACPI compliant

Outstanding Features

• Canned solution
• LAN commands follow IPMI v1.5
• MD5 secure authentication
• Support for a variety of popular LOMs
• Field Replaceable Unit (FRU) Inventory
• System Event Log (SEL)
• Sensor Data Record (SDR) Repository
• Platform Event Filtering (PEF)
• Remote secure reset, Power On/Off
• Remote settable BIOS boot options
• BIOS Alerting interface
• System health monitoring using SMBus-based sensors
• LAN Alerting in PET format
• Watchdog Timer
• Host, LOM and Peripheral interfaces, via SMBus
• Intelligent Platform Managment Bus (PC87431C)
• Digital Input Event pins and General-Purpose Output pins
• Integrated Fan control and ADC (PC87431S/C)
• Integrated flash, to reduce system cost
• Two LEDs, with Bi-color LED control
• Inhibit strap, to enable the system to work with the daughter board of an advanced BMC

Device-Specific Information

The following table shows the main features for the devices in the PC87431x family.

The package type is specified by two letters (L or T) that follow the part number:

• LLP package - PC87431xxx/L
• TSSOP package - PC87431xxx/T

• Three SMBus 2.0 compatible Interfaces
• System Chassis Control
• Digital Input Events and General-Purpose Outputs

IPMI and DMTF/ASF Support

• Supports Intelligent Platform Management Interface (IPMI) Specification v1.5 (Revision 1.1), February 20, 2002
• Supports LAN Alert sending as SNMP Trap in IPMI Platform Event Trap Format v1.0, December 7, 1998
• Secure Authentication, based on RFC 1321, The MD5 Message-Digest Algorithm, R. Rivest, MIT Laboratory for Computer Science and RSA Data Security, Inc., April 1992

Host Interface

• Fault Resilient Booting (FRB) support with autonomous system reset, power cycling and CPU or BIOS switch.
• Critical event alerting from system monitoring device on peripheral SMBus interface

Peripheral Interface

• LMxx-like Sensor devices for system health monitoring
• Supports PC874xx LPC SuperI/O for Servers and Workstations.

Integrated ADC Channels and Fan Control (PC87431S/C)

• 10-bit successive approximation Analog to Digital converter (up to 12 channels)
• Fan Speed Control for three fans
• Fan Speed Monitor for two fans

Internal Flash

• Stores the following:
• Sensor access table
• Sensor configuration table
• Customizing table
• 512 bytes for FRU Inventory or OEM data

Clocking, Supply and Package Information

• Strap Input Controlled Operating Modes:
• Inhibit mode
• Clocks:
• Single 10 MHz crystal oscillator
• Power Supply:
• Single supply operation: 4.7V - 5.5V
• Package Options:
• 48-pin TSSOP
• 44-pin LLP

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