Introduction
This document describes the procedure to reprogram the EEPROM memory of the STNRG328S device mounted on boards
with STC/HSTC topologies. The procedure involves downloading the binary file stsw-stc in hex format using the USB/TTL-
RS232 cable adapter.
The example below shows a board with STC topology and STNRG328S mounted. The design is based on X7R components
(switch capacitors and resonant inductors) for rate conversion 4:1 (from 48 V input bus to 12 V Vout), able to deliver 1 kW power
in server applications.
Figure 1.
X7R-1kW board in STC topology with STNRG328S
The binary code stsw-stc can be downloaded from the link
https://www.st.com/en/product/stnrg328s
. The stsw-stc supports the
PMBUS communication. You can find the command list and more information about the device at the same location.
Important:
Contact the local sales office when programming the chip for the first time.
STNRG328S EEPROM programming procedure
UM2988
User manual
UM2988
-
Rev 1
-
March 2022
For further information contact your local STMicroelectronics sales office.
www.st.com
