MAX8688BLETG+ Maxim Integrated Products, MAX8688BLETG+ Datasheet - Page 26

• Manufacturer Part Number: MAX8688BLETG+
• Description: IC PWR SUPPLY CTRLR/MONTR 24TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8688BLETG+

• Applications: Power Supply Controller/Monitor
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 6.7mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TQFN Exposed Pad
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Digital Power-Supply Controller/Monitor
with PMBus Interface
A summary of the PMBus commands supported by the
MAX8688 is described in Table 4.
The OPERATION command is used to turn the POL on
and off in conjunction with ENOUT according to the
ENOUT polarity select setup. The OPERATION com-
mand is also used to cause the POL to set the output
voltage to the upper or lower margin voltages. The POL
stays in the commanded operating mode until a subse-
quent OPERATION command or change in the state of
A3/ONOFF (if enabled) instructs the POL to change to
another state.
The valid OPERATION command byte values are shown
in Table 5.
The OPERATION command controls how the MAX8688
responds when commanded to change the output. When
the command byte is 00h, the MAX8688 turns the POL off
immediately and ignores any programmed turn-off delay
and fall time. When the command byte is set to 40h, the
MAX8688 powers down according to the programmed
turn-off delay and fall time.
In Table 5, Act On Fault means that if an output overvolt-
age warning or output overvoltage fault is detected when
the output is margined high, the MAX8688 treats this as a
warning or fault and responds as programmed by the
warning limit or fault response command. Similarly, if an
output undervoltage warning or output undervoltage fault
is detected when the output is margined low, the
MAX8688 treats this as a qualified warning/fault event
and responds as programmed by the warning/fault limit
or fault response command.
Any command value not shown in Table 5 is an invalid
command. If a MAX8688 receives a data byte that is not
listed in Table 5, then it may treat this as invalid data,
Table 5. OPERATION Command Byte
26
COMMAND
BYTE
______________________________________________________________________________________
A8h
00h
40h
80h
98h
POL ON OR OFF
Immediate off (no
sequencing)
sequencing)
Soft-off (with
On
On
On
PMBus Commands
OPERATION (01h)
—
—
Margin off (Nominal)
Margin low (Act On
Fault)
Margin high (Act On
Fault)
MARGIN STATE
declare a communications fault (set CML bit and assert
FLT), and respond as described in the Fault
Management and Reporting section.
The default OPERATION value is 00h.
The CLEAR_FAULTS command is used to clear any
fault bits that have been set. This command clears all
bits in the STATUS_BYTE and MFR_FAULT_STATUS
registers simultaneously. It also deasserts FLT.
The CLEAR_FAULTS command does not cause a POL
that has latched off for a fault condition to restart. The
status of ENOUT under fault conditions is not affected
by this command and should change only if command-
ed through the OPERATION command or A3/ONOFF.
If the fault is still present after the CLEAR_FAULTS
command is executed, the fault bit shall be set again
and the host notified by the usual means.
This command is write-only. There is no data byte for
this command.
The STORE_DEFAULT_ALL command instructs the
MAX8688 to store configuration information to an exter-
nal I
A2/SDAE. If an error occurs during storing, FLT asserts
and the CML bit is set to 1.
It is permitted to use the STORE_DEFAULT_ALL com-
mand while the POL is operating. However, the
MAX8688 is unresponsive to PMBus commands while
storing the configuration. ENOUT maintains its state.
This command is write-only. There is no data byte for
this command.
For information on EEPROM contents, see the External
EEPROM Interface section .
The RESTORE_DEFAULT_ALL command instructs the
MAX8688 to restore configuration information from an
external I
A2/SDAE. The RESTORE_DEFAULT_ALL command
can only be executed when the POL is off. Otherwise, a
communication fault occurs (CML = 1) and FLT asserts.
If an error occurs during restoration, FLT asserts and
the CML bit is set to 1.
The STATUS_BYTE and MFR_FAULT_STATUS values are
not restored by the RESTORE_DEFAULT_ALL command.
This command is write-only. There is no data byte for
this command.
For information on EEPROM contents, see the External
EEPROM Interface section.
2
C EEPROM device attached to A1/SCLE and
2
C EEPROM device attached to A1/SCLE and
RESTORE_DEFAULT_ALL (12h)
STORE_DEFAULT_ALL (11h)
CLEAR_FAULTS (03h)