MAX5978ETJ+ Maxim Integrated Products, MAX5978ETJ+ Datasheet - Page 32

• Manufacturer Part Number: MAX5978ETJ+
• Description: Hot Swap & Power Distribution 0-16V HOTSWAP CONTLR W/10BIT CUR VOLT MON
• Manufacturer: Maxim Integrated Products

Specifications of MAX5978ETJ+

• Product: Controllers & Switches
• Supply Voltage (max): 16 V
• Supply Voltage (min): 0 V
• Power Dissipation: 2759 mW
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Supply Current: 2.5 mA
• Package / Case: TQFN-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

0 to 16V, Hot-Swap Controller with 10-Bit
Current, Voltage Monitor, and 4 LED Drivers
When an overcurrent event (fast trip or slow trip) causes
the device to shut down the hot-swap channel, an open-
drain FAULT output is asserted low. Note that the FAULT
output is not asserted for shutdowns caused by critical
undervoltage or overvoltage events.
The FAULT output is cleared when the channel is dis-
abled by pulling ON low or by clearing the bits in register
chxen.
ALERT is an open-drain output that is asserted low any
time that a fault or other condition requiring attention has
occurred. The state of the ALERT output is also indicated
by status3[4].
The ALERT output is the logical NOR of registers 0x31,
0x35, 0x36, and 0x37, so when the ALERT output goes
low, the system microcontroller should query these reg-
isters through the I
the ALERT assertion.
Table 50. LED_Flash/GPIO Enable Register
Table 51. LED Phase/Weak Pullup Enable Register
32
Description:
Register Title:
Register Address:
Description:
Register Title:
Register Address:
Phase
LED4
Flash
LED4
Bit 7
Bit 7
R/W
R/W
Phase
LED3
LED3
Flash
Bit 6
Bit 6
R/W
R/W
2
C interface to determine the cause of
LED_ flash/GPIO enable register
LED_flash
0x43
LED phase/weak pullup enable
LED_ph_pu
0x44
Phase
LED2
Flash
LED2
R/W
Bit 5
R/W
Bit 5
FAULT Output
ALERT Output
LED1 Flash
Phase
LED1
R/W
Bit 4
Bit 4
R/W
LED4 Weak
LED4 Set
R/W
Bit 3
R/W
Bit 3
PU
The device has four open-drain LED drivers/user-pro-
grammable GPIOs. When programmed as LED drivers,
each driver can sink up to 25mA of current. Table 50
shows the register that enables the drivers as either LED
drivers or GPIOs.
When any of the LED_ Set bit in the register is set to 1,
the corresponding open-drain LED driver is turned off.
The LED_Flash bits enable each corresponding LED
driver to flash on and off at 1Hz frequency regardless of
the condition of the corresponding LED_ Set bit.
Bits 7–4 in Table 51 set the LED flashing drivers to be
either in-phase or out-of-phase with the internal 1Hz
clock. Bits 3–0 enable the 4FA pullup current to the cor-
responding output.
Table 52 shows the LED state register. The LED state reg-
ister is a read-only register. When the LEDs are disabled,
the pins are configured as GPIOs. Applying an external
voltage below 0.4V sets the GPIOs low and, applying an
external voltage above 1.4V, sets the GPIOs high.
LED3 Set
LED3 Weak
Bit 2
R/W
Bit 2
R/W
PU
LED2 Set
LED2 Weak
Bit 1
R/W
R/W
Bit 1
PU
LED1 Set
LED1 Weak
R/W
Bit 0
LED Set Registers
Bit 0
R/W
PU
RESET
VALUE
VALUE
RESET
0x0F
0x00
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