LTC4261/LTC4261-2

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Table 3. STATUS Register A (00h)—Read Only

BIT

NAME

OPERATION

A7

FET On

Indicates State of FET; 1 = FET On, 0 = FET Off

A6

PGIO Input

Indicates State of the PGIO Pin when Configured to General Purpose Input: 1 = PGIO High, 0 = PGIO Low

A5

FET Short

Indicates Potential FET Short if Current Sense Voltage Exceeds 2mV While FET is Off; 1 = FET is Shorted, 0 = FET is Not Shorted

A4

EN

Indicates State of the EN Pin; 1 = EN Pin High, 0 = EN Pin Low

A3

Power Bad

Indicates Power is Bad when PGI is High at the End of the PGI Check Timer; 1 = PGI High, 0 = PGI Low

A2

Overcurrent

Indicates Overcurrent Condition; 1 = Overcurrent, 0 = Not Overcurrent

A1

Undervoltage

Indicates Input Undervoltage when Both UVH and UVL are Low; 1 = UVH and UVL Low, 0 = UVH or UVL High

A0

Overvoltage

Indicates Input Overvoltage when OV is High; 1 = OV High, 0 = OV Low

Table 4. FAULT Register B (01h)—Read/Write

BIT

NAME

OPERATION

B7

External Fault

Occurred

Latched to 1 if FLTIN Goes Low; 1 = FLTIN Low State Detected, 0 = FLTIN has Not Been Low

B6

PGIO Input

High Occurred

Latched to 1 if the PGIO Pin Goes High when Configured to General Purpose Input; 1 = PGIO High Detected,

0 = PGIO has Been Low

B5

FET Short Fault

Occurred

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

B4

EN Changed

State

Indicates That a Board was Inserted or Extracted when EN Changed State; 1 = EN Changed State, 0 = EN Unchanged

B3

Power Bad

Fault Occurred

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

B2

Overcurrent

Fault Occurred

Indicates Overcurrent Fault Occurred; 1 = Overcurrent Fault Occurred, 0 = No Overcurrent Fault

B1

Undervoltage

Fault Occurred

Indicates Input Undervoltage Fault Occurred when Both UVH and UVL went Low; 1 = Undervoltage Fault Occurred,

0 = No Undervoltage Fault

B0

Overvoltage

Fault Occurred

Indicates Input Overvoltage Fault Occurred when OV was High; 1 = Overvoltage Fault Occurred, 0 = No Overvoltage Fault

Table 5. ALERT Register C (02h)—Read/Write

BIT

NAME

OPERATION

C7

External Fault

Alert

Enables Alert for External Fault When FLTIN was Low; 1 = Enable Alert, 0 = Disable Alert (Default)

C6

PGIO Output

Output Data Bit to PGIO Pin when Configured as Output. Defaults to 0

C5

FET Short Alert

Enables Alert for FET Short Fault; 1 = Enable Alert, 0 = Disable Alert (Default)

C4

EN State

Change Alert

Enables Alert when EN Changed State; 1 = Enable Alert, 0 Disable Alert (Default)

C3

Power Bad

Alert

Enables Alert for Power Bad Fault; 1 = Enable Alert, 0 Disable Alert (Default)

C2

Overcurrent

Alert

Enables Alert for Overcurrent Fault; 1 = Enable Alert, 0 Disable Alert (Default)

C1

Undervoltage

Alert

Enables Alert for Undervoltage Fault; 1 = Enable Alert, 0 Disable Alert (Default)

C0

Overvoltage

Alert

Enables Alert for Overvoltage Fault; 1 = Enable Alert, 0 Disable Alert (Default)

APPLICATIONS INFORMATION