GE Industrial Solutions ACE184 Series - Manual (Page 4)

GE Energy Preliminary Data Sheet
ACE184 Series Power Shelf
Main Output: 600A; Standby output: 8A
October 29, 2012 ©2012 General Electric Company. All rights reserved. Page 4
These signals are brought out independently for each power
supply.
Interrupt (SMBAlert): A TTL compatible status signal,
representing the SMBusAlert# feature of the PMBus
compatible i 2 C protocol in the power supply. This signal
needs to be pulled HI externally through a resistor.
Maximum sink current ≤ 4mA and the pull up resistor should
be tied to 3.3Vdc. Open collector (HI) on this signal indicates
that no Interrupt has been triggered.
This signal is paralleled among the power supplies.
Serial Bus Communications
The I²C interface facilitates the monitoring and control of
various operating parameters within the unit and transmits
these on demand over an industry standard I²C Serial bus.
All signals are referenced to ‘Signal Return’.
Device addressing: The microcontroller (MCU) and the
EEPROM have the following addresses:
Device Address Address Bit Assignments
(Most to Least Significant)
MCU 0xBx 1 0 1 1 A2 A1 A0 R/W
EEPROM 0xAx 1 0 1 0 A2 A1 A0 R/W
Address lines (A1, A0): These signal pins allow up to four (4)
modules to be addressed on a single I²C bus. The pins are
configured automatically in the shelf. Rectifier addressing
increments from left to right as viewed from the front.
Address line (A2): This bit sets the address of the shelf. The
bit setting depends on the rear accessible dip switch and pin
51 of the signal connector. In order to set the address HI
(‘1’), the dip switch needs to be set to Mark 1 and the signal
pin needs to be left open. Setting the dip switch to Mark 0 or
grounding pin 51 will configure the shelf to address bit 0
(LO).
Serial Clock (SCL): The clock pulses on this line are generated
by the host that initiates communications across the I²C
Serial bus. This signal is pulled up internally to 3.3V [ 5V
2 ] by
a 10kΩ resistor. The end user should add additional pull up
resistance as necessary to ensure that rise and fall time
timing and the maximum sink current is in compliance to
the I²C specifications.
This signal is paralleled among the power supplies.
Serial Data (SDA): This line is a bi-directional data line. . This
signal is pulled up internally to 3.3V [ 5V ] by a 10kΩ resistor.
The end user should add additional pull up resistance as
necessary to ensure that rise and fall time timing and the
maximum sink current is in compliance to the I²C
specifications.
This signal is paralleled among the power supplies.
EEPROM
The microcontroller has 96 bytes of EEPROM memory
available for the system host.
2 Module configured with 5V standby output
Another separate EEPROM IC will provide another 128 bytes
of memory with write protect feature. Minimum information
to be included in this separate EEPROM: model number,
revision, date code, serial number etc.
See the communications protocol for further information.
Communications Protocol
The I²C protocol is described in detail by the I2C and PMBus
Serial Communications Protocol for the CAR Family of
Power Supplies application note.( Document # 97FS2855)