LTC4261 LINER [Linear Technology], LTC4261 Datasheet - Page 28

• Manufacturer Part Number: LTC4261
• Description: Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring
• Manufacturer: LINER [Linear Technology]

LTC4261/LTC4261-2
APPLICATIONS INFORMATION
Table 3. STATUS Register A (00h)—Read Only
BIT
A7
A6
A5
A4
A3
A2
A1
A0
Table 4. FAULT Register B (01h)—Read/Write
BIT
B7
B6
B5
B4
B3
B2
B1
B0
Table 5. ALERT Register C (02h)—Read/Write
BIT
C7
C6
C5
C4
C3
C2
C1
C0
28
NAME
FET On
PGIO Input
FET Short
EN
Power Bad
Overcurrent
Undervoltage
Overvoltage
NAME
External Fault
Occurred
PGIO Input
High Occurred
FET Short Fault
Occurred
EN Changed
State
Power Bad
Fault Occurred
Overcurrent
Fault Occurred
Undervoltage
Fault Occurred
Overvoltage
Fault Occurred
NAME
External Fault
Alert
PGIO Output
FET Short Alert
EN State
Change Alert
Power Bad
Alert
Overcurrent
Alert
Undervoltage
Alert
Overvoltage
Alert
OPERATION
Indicates State of FET; 1 = FET On, 0 = FET Off
Indicates State of the PGIO Pin when Confi gured to General Purpose Input: 1 = PGIO High, 0 = PGIO Low
Indicates Potential FET Short if Current Sense Voltage Exceeds 2mV While FET is Off; 1 = FET is Shorted, 0 = FET is Not Shorted
Indicates State of the EN Pin; 1 = EN Pin High, 0 = EN Pin Low
Indicates Power is Bad when PGI is High at the End of the PGI Check Timer; 1 = PGI High, 0 = PGI Low
Indicates Overcurrent Condition; 1 = Overcurrent, 0 = Not Overcurrent
Indicates Input Undervoltage when Both UVH and UVL are Low; 1 = UVH and UVL Low, 0 = UVH or UVL High
Indicates Input Overvoltage when OV is High; 1 = OV High, 0 = OV Low
OPERATION
Latched to 1 if FLTIN Goes Low; 1 = FLTIN Low State Detected, 0 = FLTIN has Not Been Low
Latched to 1 if the PGIO Pin Goes High when Confi gured to General Purpose Input; 1 = PGIO High Detected,
0 = PGIO has Been Low
Indicates Potential FET Short was Detected When Measured Current Sense Voltage Exceeded 2mV While FET was Off;
1 = FET Short Fault Occurred, 0 = No FET Short Fault
Indicates That a Board was Inserted or Extracted when EN Changed State; 1 = EN Changed State, 0 = EN Unchanged
Indicates Power was Bad when PGI was High at the End of the PGI Check Timer; 1 = Power Bad Fault Occurred,
0 = No Power Bad Fault
Indicates Overcurrent Fault Occurred; 1 = Overcurrent Fault Occurred, 0 = No Overcurrent Fault
Indicates Input Undervoltage Fault Occurred when Both UVH and UVL went Low; 1 = Undervoltage Fault Occurred,
0 = No Undervoltage Fault
Indicates Input Overvoltage Fault Occurred when OV was High; 1 = Overvoltage Fault Occurred, 0 = No Overvoltage Fault
OPERATION
Enables Alert for External Fault When FLTIN was Low; 1 = Enable Alert, 0 = Disable Alert (Default)
Output Data Bit to PGIO Pin when Confi gured as Output. Defaults to 0
Enables Alert for FET Short Fault; 1 = Enable Alert, 0 = Disable Alert (Default)
Enables Alert when EN Changed State; 1 = Enable Alert, 0 Disable Alert (Default)
Enables Alert for Power Bad Fault; 1 = Enable Alert, 0 Disable Alert (Default)
Enables Alert for Overcurrent Fault; 1 = Enable Alert, 0 Disable Alert (Default)
Enables Alert for Undervoltage Fault; 1 = Enable Alert, 0 Disable Alert (Default)
Enables Alert for Overvoltage Fault; 1 = Enable Alert, 0 Disable Alert (Default)
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