MAX34440ETL+ Maxim Integrated Products, MAX34440ETL+ Datasheet - Page 26

• Manufacturer Part Number: MAX34440ETL+
• Description: Supervisory Circuits PMBUS 6-CH POW SUPPLY MANAGER
• Manufacturer: Maxim Integrated Products

Specifications of MAX34440ETL+

• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Supply Current (typ): 2.5 mA
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Package / Case: TQFN-40
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The STORE_DEFAULT_ALL command instructs the device to transfer the device configuration information to the internal
flash memory array. Not all information is stored. Only configuration data is stored, not any status, or operational data.
If an error occurs during the transfer, ALERT asserts if enabled and the CML bit in STATUS_BYTE and STATUS_WORD
is set to 1. No bits are set in STATUS_CML. It is NOT recommended to use the STORE_DEFAULT_ALL command
while the device is operating power supplies. The device is unresponsive to PMBus commands and does not
monitor power supplies while transferring the configuration. This command is write-only. There is no data byte for this
command.
USER NOTE: V
The RESTORE_DEFAULT_ALL command transfers the default configuration information from the internal flash memory
array to the user memory registers in the device. The RESTORE_DEFAULT_ALL command should only be executed
when the device is not operating the power supplies. Upon a device reset, this command is automatically executed
by the device without PMBus action required. This command is write-only. There is no data byte for this command.
The CAPABILITY command is used to determine some key capabilities of the device. The CAPABILITY command is
read-only. The message content is described in the Table 12.
The VOUT_MODE command is used to report the data format of the device. The device uses the DIRECT format for all
the voltage-related commands. The value returned is 40h, indicating DIRECT data format. This command is read-only.
If a host attempts to write this command, the CML status bit is asserted. See Table 3 for the m, b, and R values for the
various commands.
The VOUT_MARGIN_HIGH command loads the device with the voltage to which the power-supply output is to be
changed when the OPERATION command is set to margin high. If the power supply is already operating at margin
high, changing VOUT_MARGIN_HIGH has no effect on the output voltage. The device only adjusts the power supply to
the new VOUT_MARGIN_HIGH voltage after receiving a new margin high OPERATION command. The 2 data bytes are
in DIRECT format. If the device cannot successfully close-loop margin the power supply, the device keeps attempting
to margin the supply and does the following:
1) Sets the NONE OF THE ABOVE bit in STATUS_BYTE.
2) Sets the NONE OF THE ABOVE and MFR bits in STATUS_WORD.
3) Sets the MARGIN_FAULT bit in STATUS_MFR_SPECIFIC.
4) Notifies the host through ALERT assertion (if enabled in MFR_MODE).
PMBus 6-Channel Power-Supply Manager
Table 12. CAPABILITY Command Byte
26
BIT
6:5
3:0
7
4
Packet-Error Checking
PMBus Speed
ALERT
Reserved
DD
must be above 2.9V for the device to perform the STORE_DEFAULT_ALL command.
DESCRIPTION
0 = PEC not supported.
00 = Maximum supported bus speed is 100kHz.
1 = Device supports an ALERT output (if ALERT is enabled in MFR_MODE).
0 = Device does not support ALERT output (ALERT is disabled in MFR_MODE).
Always returns 0000.
MEANING
RESTORE_DEFAULT_ALL (12h)
STORE_DEFAULT_ALL (11h)
VOUT_MARGIN_HIGH (25h)
VOUT_MODE (20h)
CAPABILITY (19h)