LTC4255

7

4255f

B4: Current Limit Timer Select Bit 0. The current limit

AC Characteristics.)

B5: Current Limit Timer Select Bit 1. The current limit

AC Characteristics.)

B6: Open-Circuit Enable Delay Timer Select Bit 0. The

the time following a Power_OK condition when no open-

teristics.)

B7: Open-Circuit Enable Delay Timer Select Bit 1. The

the time following a Power_OK condition when no open-

teristics.)

The default setting is all bits set low.

Register 3: Status Register 1 (Read Only)

C0: Power_OK for Port 1. Logic high indicates switch 1

is on.

C1: Power_OK for Port 2. Logic high indicates switch 2

is on.

C2: Power_OK for Port 3. Logic high indicates switch 3

is on.

C3: Power_OK for Port 4. Logic high indicates switch 4

is on.

C4: Reserved. Logic high.

C5: Reserved. Logic low.

C6: Reserved. Logic low.

C7: Reserved. Logic low.

Register 1: Control Register ( Write Only)

A0: Switch 1 Enable. Logic high turns on Port 1 switch,

logic low turns off the Port 1 switch.

A1: Switch 2 Enable. Logic high turns on Port 2 switch,

logic low turns off Port 2 switch.

A2: Switch 3 Enable. Logic high turns on Port 3 switch,

logic low turns off Port 3 switch.

A3: Switch 4 Enable. Logic high turns on Port 4 switch,

logic low turns off Port 4 switch.

A4: Relay 1 Enable. Logic high turns on Port 1 relay, logic

low turns off Port 1 relay.

A5: Relay 2 Enable. Logic high turns on Port 2 relay, logic

low turns off Port 2 relay.

A6: Relay 3 Enable. Logic high turns on Port 3 relay, logic

low turns off Port 3 relay.

A7: Relay 4 Enable. Logic high turns on Port 4 relay, logic

low turns off Port 4 relay.

The default setting is all bits set low.

Register 2: Setup Register (Write Only)

B0: Fault Clear Bit. Logic high clears any fault bits that are

set.

B1: Autoretry Enable Bit. Logic high enables autoretry

following short-circuit faults. Logic low disables autoretry.

B2: Open-Circuit Detect Enable Bit. Logic high enables and

logic low disables open-circuit fault detection.

B3: Retry Duty Cycle Select Bit. Logic high sets the

autoretry duty cycle to 6%. Logic low sets the autoretry

duty cycle to 0.83%. When autoretry is not enabled (B1 =

low), the switch turn-on after A0 to A3 are set to high will

be delayed to enforce the selected retry duty cycle.

REGISTER DEFI ITIO S