LTC5100 datasheet(32/52 Pages) LINER

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LTC5100

sn5100 5100fs

Standalone Operation

On power-up the LTC5100 becomes an I2C bus master

and attempts to load its configuration data from an exter-

nal EEPROM. If an EEPROM responds, the LTC5100 reads

16-bytes of data and transfers this data to the internal

error, the LTC5100 becomes ready to enable the transmit-

ter and begin driving the laser. If a bus error occurs during

this transfer, the load sequence is aborted and a

Mem_load_error is generated, preventing the transmitter

from being enabled until a successful memory load at-

tempt is completed or until an external agent sets the

Operating_mode bit. Every 64ms another attempt is made

to load the EEPROM until the memory is read or until

Operating_mode = 1. Table 5 shows the memory map for

the EEPROM.

The LTC5100 generates I2C address 0xAE (1010_1110

binary) when accessing the EEPROM, making it compat-

ible with a wide range of EEPROM sizes. Table 6 details

how the LTC5100 interacts with EEPROMs from 128 bits

to 16k bits and from where it gets its data.

The LTC5100 supports hot plugging in standalone mode.

If the Soft_en bit is set in the EEPROM and the EN pin is

active, the LTC5100 loads its configuration data from the

EEPROM and immediately enables the transmitter. The

transmitter is typically enabled and settled within the

300ms t_init period required by the GBIC specification.

OPERATIO

Table 5. EEPROM Memory Map

BIT

BYTE 7

Reserved

Peaking (4:0)

Ib_gain(4:0)/Apc_gain(4:0)

Im_gain(2:0)

Reserved

Imd_rng(1:0)

T_nom(9:8)

T_nom(7:0)

Im_tc2(7:0)

Im_tc1(7:0)

Reserved

Im_rng(1:0)

Im_nom(9:8)

Im_nom(7:0)

Ib_tc2(7:0)/Imd_tc2(7:0)

Ib_tc1(7:0)/Imd_tc2(7:0)

Reserved

Is_rng(1:0)

Ib_nom(9:8)/Imd_nom (9:8)

Ib_nom(7:0)/Imd_nom(7:0)

Reserved

Rep_flt_inhibit Rapid_restart_en Flt_drv_mode

Lpc_en

Auto_shutdn_en Flt_pin_polarity Flt_pin_override Force_flt

Over_pwr_en

Under_pwr_en Over_current_en

Reserved

Ib_limit

Cml_en

Md_polarity

Ext_temp_en

Power_down_en Apc_en

En_polarity

Soft_en

Operating_mode

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