LTC5100EUF datasheet(41/52 Pages) LINER

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LTC5100

sn5100 5100fs

Table 20. Register: FLT_CONFIG—Fault Configuration (Refer also to Table 1) (I2C Command Code 0x13)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:12

Rep_flt_inhibit

Repeated Fault Inhibit

0: Allow Repeated Attempts to Clear a Fault and Re-enable the Transmitter.

1: Inhibit Repeated Attempts to Clear a Fault. Only One Attempt to Clear a Fault is Allowed. If the Fault

Recurs Within 25ms of Re-enabling the Transmitter, the Transmitter is Disabled Until Power is

Cycled.

Rapid_restart_en

0: Rapid Restart Disabled: The Servo Controller Settings for the Laser Bias and Modulation Currents

are Reset to Zero when the Transmitter is Disabled. When Re-enabled, the Laser Currents Start from

Zero and Settle Typically Within the 300ms Standard Initialization Time, t_int, from the GBIC

Specification.

1: Rapid Restart Enabled: The Servo Controller Settings for the Laser Bias and Modulation Currents are

Retained when the Transmitter is Disabled. When Re-enabled, the Retained Servo Values are Loaded

into the SRC_DAC and MOD_DAC, Allowing Settling Typically Within the 1ms Standard Turn-On

Time, t_on, from the GBIC Specification.

Flt_drv_mode

FAULT Pin Drive Mode

00: Open Drain (3.3mA Sink Capability)

01: Open Drain, 280

µA Internal Pull Up

10: Open Drain, 425

µA Internal Pull Up

11: Push-Pull (3.3mA Source and Sink Capability)

Lpc_en

Laser Power Controller (LPC) Enable

0: LPC Disabled: Allows External Control of the SRC_DAC and MOD_DAC Registers from the Serial

Interface. This Setting Gives an External Microprocessor or Test Computer Full Control of the

SRC_DAC and MOD_DAC Registers.

1: LPC Enabled: The LPC Continuously Updates the SRC_DAC and MOD_DAC Registers to Servo

Control the Laser. (Any Values Written to These Registers Over the Serial Interface Will be

Overwritten by the LPC.)

Auto_shutdn_en

Automatic Transmitter Shutdown Enable

0: Disabled: When a Fault Occurs the LTC5100 Continues to Drive the Laser. This Mode Allows a

Microprocessor or Test Computer to Mediate the Decision to Shut Down the Transmitter. The

Microprocessor can Turn Off the Transmitter by Driving the EN Pin Inactive or by Clearing the

Soft_en Bit in the SYS_CONFIG Register.

1: Enabled: When a Fault Occurs, the Transmitter is Automatically Disabled.

Flt_pin_polarity

FAULT Pin Polarity

0: Active Low: The FAULT Pin is Driven Low to Signal a Fault.

1: Active High: The FAULT Pin is Driven High to Signal a Fault.

Flt_pin_override

FAULT Pin Override

0: The FAULT Pin is Driven Active when a Fault Occurs.

1: Internal Control of the FAULT Pin is Overridden. When a Fault Occurs, the Fault is Detected and

Latched Internally, but the FAULT Pin Remains Inactive. This Mode Allows a Microprocessor or Test

Computer to Mediate Fault Handling. The Microprocessor can Drive the FAULT Pin Active by Setting

the Force_flt Bit.

Force_flt

Force the FAULT Pin Output.

Force_flt Gives a Microprocessor or Test Computer Full Control of the FAULT Pin, Allowing External

Mediation of Fault Handling.

0: Force the FAULT Pin Inactive.

1: Force the FAULT Pin Active.

This Bit Has No Effect Unless Flt_pin_override = 1.

Over_pwr_en

Enables Detection of a Laser Overpower Fault.

0: Disabled, 1: Enabled

Under_pwr_en

Enables Detection of a Laser Underpower Fault.

0: Disabled, 1: Enabled

Over_current_en

Enables Detection of a Laser Overcurrent Fault.

0: Disabled, 1 Enabled

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