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MAX5946L Evaluation Kit/Evaluation System
Table 2. Channel A Switch Functions
SWITCH
SW5
SW5
SW6
SW6
SWITCH STATE
On
Off
On
Off
MAX5946L PIN CONNECTION
ONA pin pulled high
ONA pin pulled low
AUXONA pin pulled high
AUXONA pin pulled low
MAX5946L OPERATION
Enable channel A main outputs
Disable channel A main outputs
Enable channel A +3.3V auxiliary output
Disable channel A +3.3V auxiliary output
Table 3. Channel B Switch Functions
SWITCH
SW3
SW3
SW4
SW4
SWITCH STATE
On
Off
On
Off
MAX5946L PIN CONNECTION
ONB pin pulled high
ONB pin pulled low
AUXONB pin pulled high
AUXONB pin pulled low
MAX5946L OPERATION
Enable channel B main outputs
Disable channel B main outputs
Enable channel B +3.3V auxiliary output
Disable channel B +3.3V auxiliary output
Channel A Enable/Disable Switches
The MAX5946L EV kit features two switches to
enable/disable the 12V/3.3V main and 3.3V auxiliary
channel A outputs. The switches can also be used to
reset a channel that has latched off after a fault has
occurred. Table 2 lists the various switch options.
Channel B Enable/Disable Switches
The MAX5946L EV kit features two switches to
enable/disable the 12V/3.3V main and 3.3V auxiliary
channel B outputs. The switches can also be used to
reset a channel that has latched off after a fault has
occurred. Table 3 lists the various switch options.
Control Methods, Other Configurations,
and I/O Expander
Fault Resetting
The MAX5946L EV kit features two slide switches to
reset a latched fault at each channel. The switch will
reset the EV kit and unlatch faults when toggled from
ON to OFF and back to ON. See Table 2 for resetting
channel A or Table 3 for channel B. Refer to the
MAX5946L data sheet for additional functions of the
MAX5946L ONA or ONB pins.
Fault Timeout and POR Periods
The MAX5946L fault timeout period is configured for
10ms and can be reconfigured to a new timeout period
by installing surface-mount resistor R5. The MAX5946L
POR timeout period is configured for 160ms; however,
a new POR timeout period can be reconfigured by
installing surface-mount resistor R27. Refer to the
MAX5946 data sheet’s Applications Information section
to select the values of resistors R5 or R27.
Forced-On Inputs
Either channel A or B’s PCI Express slot can be forced
to turn on regardless of the MAX5946L logic status
inputs. To force channel A on, install surface-mount
resistor R28; to force channel B on, install surface-
mount resistor R8. Typical values are less than 1k Ω .
Current Limiting
The MAX5946L EV kit can evaluate other current-limit
configurations for the 12V and 3.3V main outputs of
either channel. Resistors R1 and R2 set the 12V current
limit for channels A and B, respectively. Resistors R3
and R4 set the 3.3V current limit for channels A and B,
respectively.
The 3.3V auxiliary current limit is fixed at 470mA (typ)
and is not reconfigurable. Refer to the MAX5946 IC
data sheet for information on selecting other current-
limit resistors.
Evaluating Other MAX5946 Hot-Plug Controllers
The MAX5946L EV kit can be used to evaluate the
MAX5946A. Replace U1 with the MAX5946A IC.
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