MAX5970ETX+ Maxim Integrated Products, MAX5970ETX+ Datasheet - Page 33

• Manufacturer Part Number: MAX5970ETX+
• Description: IC CTLR HOT-SWAP DUAL 36TQFN
• Manufacturer: Maxim Integrated Products
• Type: Hot-Swap Controllerr

Specifications of MAX5970ETX+

• Applications: General Purpose, PCI Express
• Internal Switch(s): No
• Voltage - Supply: 2.7 V ~ 16 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

0V to 16V, Dual Hot-Swap Controller with 10-Bit
When the force-on bit for a channel is set to 1 in register
foset[1:0] (see Table 45), the channel is enabled regard-
less of the ON_ voltage or the Chx_EN1 and Chx_EN2
bits in register chxen. In forced-on operation, all func-
tions operate normally with the notable exception that the
channel does not shut down due to any fault conditions
that may arise.
Table 45. Force-On Control Register Format
Table 46. Force-On Key Register Format
The MAX5970 provides detailed information about any
fault conditions that have occurred. Independent FAULT_
outputs specifically indicate circuit-breaker shutdown
events, while an ALERT output is asserted whenever a
problem has occurred that requires attention or interaction.
Table 47. Undervoltage Status Register Format
Description:
Register Title:
Register Address:
Description:
Register Title:
Register Address:
`
Register Title:
Register Address:
Current and Voltage Monitor and 4 LED Drivers
fokey[7]
bit 7
bit 7
bit 7
R/W
—
R
0
R
fokey[6]
______________________________________________________________________________________
bit 6
Fault Logging and Indications
bit 6
bit 6
R/W
—
R
0
R
Force-on control register
foset
0x3A
Force-on key register (must contain 0xA5 to unlock force-on feature)
fokey
0x39
Undervoltage digital-compare status register (warning [1:0] and critical [5:4] undervoltage event
detection status)
fault0
0x35
ch1_uv2
fokey[5]
bit 5
R/W
bit 5
bit 5
R/C
Force-On Function
R
0
Ch0_uv2
fokey[4]
bit 4
bit 4
bit 4
R/W
R/C
R
0
fokey[3]
bit 3
R/W
bit 3
bit 3
—
R
0
R
There is a Force-On Key register fokey that must be set
to 0xA5 in order for the Force-On function to become
active (see Table 46). If this register contains any value
other than 0xA5, writing 1 to the Force-On bits in regis-
ter foset has no effect. This provides protection against
accidental force-on operation that might otherwise be
caused by an erroneous I
If a fault event occurs (digital UV warning/critical, digital
OV warning/critical, or digital overcurrent warning), the
fault is logged by setting a corresponding bit in registers
fault1 or fault2 (see Tables 47, 48, and 49).
fokey[2]
bit 2
bit 2
bit 2
R/W
—
R
0
R
Ch1_uv1
fokey[1]
Ch1_fo
bit 1
R/W
bit 1
bit 1
R/W
R/C
2
C write.
Ch0_uv1
fokey[0]
Ch_fo
bit 0
R/W
bit 0
bit 0
R/W
Fault Dependency
R/C
VALUE
RESET
VALUE
VALUE
RESET
RESET
0x00
0x00
0x00
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