MAX31785ETL+ Maxim Integrated Products, MAX31785ETL+ Datasheet - Page 28

• Manufacturer Part Number: MAX31785ETL+
• Description: Board Mount Temperature Sensors 6Ch Intelligent Fan Controller
• Manufacturer: Maxim Integrated Products

Specifications of MAX31785ETL+

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

6-Channel Intelligent Fan Controller
The CLEAR_FAULTS command is used to clear any fault or warning bits in the status registers that have been set. This
command clears all bits simultaneously. If a fault is still present after the CLEAR_FAULTS command is executed, the
fault status bit is set again and the host is also notified by asserting ALERT (if enabled in MFR_MODE). This command
is write-only. There is no data byte for this command.
The WRITE_PROTECT command is used to provide protection against accidental changes to the device operating
memory. All supported commands can have their parameters read, regardless of the WRITE_PROTECT settings. The
WRITE_PROTECT message content is described in Table 10.
Table 10. WRITE_PROTECT Command Byte
Note: No fault or error is generated if the host attempts to write to a protected area.
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 opera-
tional 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 fans. The device is unresponsive to PMBus commands and does not monitor
fans 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 fans. 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 Table 11.
Table 11. CAPABILITY Command Byte
28
COMMAND BYTE
BIT
6:5
3:0
7
4
80h
40h
00h
Packet-Error Checking
PMBus Speed
ALERT
Reserved
DD
must be above 2.9V for the device to perform the STORE_DEFAULT_ALL command.
Disable all writes except the WRITE_PROTECT command.
Disable all writes except the WRITE_PROTECT and PAGE commands.
Enable writes for all commands (default).
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
MEANING
RESTORE_DEFAULT_ALL (12h)
STORE_DEFAULT_ALL (11h)
WRITE_PROTECT (10h)
CLEAR_FAULTS (03h)
CAPABILITY (19h)