data brief for further information contact your local stmicroelectronics sales office. november 2008 rev 1 1/5 5 STEVAL-ISQ006V1 usb to pmbus bridge demonstration board based on the st72f651 features usb to pmbus bridge packaged hardware board (mechanical size: 79 mm x 39 mm x 20 mm) with a usb connector user friendly graphical user interface (gui) to ? identify the connected pmbus slaves (up to four) ? configure, control and monitor the connected slaves ? write/ read different pmbus commands ? poll the alert response description the power management bus (pmbus) is a variant of the system management bus (smbus) which is targeted at digital management of power supplies. like smbus, it is a relatively slow speed two wire communications protocol based on i2c. the pmbus protocol helps to establish the first truly open communications standard for the digital control of power systems facilitating the programming, control and real-time monitoring of compliant power conversion products. the objective of this demonstration board is to show to the user the feat ures and capabilities of pmbus using st7 i2c peripheral, to support the standard pmbus commands. this demonstration board has st72651ar6 microcontroller (mcu) that has an i2c peripheral. this microcontroller acts as the pmbus master. this demonstration board works with pc gui and controls one or more pmbus compatible slaves connected on the shared bus. even though its main purpose is to interface with st pmbus devices (pm881x), it could be used to interface with other devices making use of the supported set of command. the firmware of this application performs the pmbus bus protocols mentioned in pmbus? power system management protocol specification v1.1. the firmware is in c language. STEVAL-ISQ006V1 www.st.com
circuit schematics STEVAL-ISQ006V1 2/5 1 circuit schematics figure 1. microcontroller section
STEVAL-ISQ006V1 ci rcuit schematics 3/5 figure 2. pmbus section
revision history STEVAL-ISQ006V1 4/5 2 revision history table 1. document revision history date revision changes 28-nov-2008 1 initial release.
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