LTC4280

25

4280f

APPLICATIONS INFORMATION

Table 4. STATUS Register C (02h)—Read

BIT

NAME

OPERATION

C7

FET On

1 = FET On, 0 = FET Off

C6

GPIO Input

State of the GPIO Pin; 1 = GPIO High, 0 = GPIO Low

C5

FET Short

Present

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

Shorted

C4

EN

Indicates if the LTC4280 is enabled when EN is low; 1 = EN Pin Low, 0 = EN Pin High

C3

Power Bad

Indicates Power is Bad when FB is low; 1 = FB Low, 0 = FB High

C2

Overcurrent

Indicates Overcurrent Condition During Cool Down Cycle; 1 = Overcurrent, 0 = Not Overcurrent

C1

Undervoltage

Indicates Input Undervoltage when UV is Low; 1 = UV Low, 0 = UV High

C0

Overvoltage

Table 5. FAULT Register D (03h)—Read/Write

BIT

NAME

OPERATION

D7:6

Reserved

D5

FET Short Fault

Occurred

Indicates Potential FET Short was Detected when Measured Current Sense Voltage Exceeded 1mV while FET was Off;

1 = FET is Shorted, 0 = FET is Good

D4

EN Changed

State

Indicates That the LTC4280 was Enabled or Disabled when EN Changed State; 1 = EN Changed State, 0 = EN Unchanged

D3

Power Bad

Fault Occurred

Indicates Power was Bad when FB when Low; 1 = FB was Low, 0 = FB was High

D2

Overcurrent

Fault Occurred

Indicates Overcurrent Fault Occurred; 1 = Overcurrent Fault Occurred, 0 = Not Overcurrent Faults

D1

Undervoltage

Fault Occurred

Indicates Input Undervoltage Fault Occurred when UV went Low; 1 = UV was Low, 0 = UV was High

D0

Overvoltage

Fault Occurred

Indicates Input Overvoltage Fault Occurred when OV went High; 1 = OV was High, 0 = OV was Low

Table 6. SENSE Register E (04h)—Read/Write

BIT

NAME

OPERATION

E7:0

SENSE Voltage Measurement

Sense Voltage Data. 8-Bit Data with 151μV LSB and 38.45mV Full Scale.

Table 7. SOURCE Register F (05h)—Read/Write

BIT

NAME

OPERATION

F7:0

SOURCE Voltage Measurement

Source Voltage Data. 8-Bit Data with 60.5mV LSB and 15.44V Full Scale.

Table 8. ADIN Register G (06h)—Read/Write

BIT

NAME

OPERATION

G7:0

ADIN Voltage Measurement

ADIN Voltage Data. 8-Bit Data with 4.82mV LSB and 1.23V Full Scale.