FWLF1524P2Vxx SFP Product Specification – October 2006
F i n i s a r
VIII. Digital Diagnostic Functions
All Finisar SFPs support the 2-wire serial communication protocol outlined in the SFP
MSA6. These SFPs use an Atmel AT24C01A 128 byte E2PROM with an address of A0h
(see table below for E2PROM contents). For details on interfacing with the E2PROM, see
the Atmel data sheet titled “AT24C01A/02/04/08/16 2-Wire Serial CMOS E2PROM.”7
Finisar’s CWDM SFPs also support extended diagnostic features as described in Finisar
Applications Note AN-2030, “Digital Diagnostic Monitoring Interface for Optical
Transceivers”8, and additional information is available in SFF standard titled: “Digital
Diagnostic Monitoring Interface for Optical Transceivers9 (SFF-8472 rev9.3). A
controller IC that monitors system parameters such as laser current, module temperature,
transmitter power, and received power is accessible at address A2H.
I2C clock speed, digital diagnostic accuracy and digital diagnostic range can be found in
the table below. Values in the table represent the worst-case values over temperature,
voltage, and life.
Parameter
I2C Clock Speed
Accuracy
Symbol Min Typ Max Units Notes/Conditions
0
100,000
Hz
°C
%
Bus can be driven blind
Transceiver
DDTemperature
DDVoltage
-5
-3
+5
Case temperature
Temperature
Transceiver Supply
Voltage
+3
Tx Bias Current
Tx Output Power
DDBias
DDTxPower
-10
-3
+10
+3
%
dB
100% tested in production
over temp to ±2 dB
Received Average
Power
DDRxPower
-3
+3
dB
100% tested in production
over temp to ±2 dB
Range
Transceiver
DDTemperature -10
80
°C
V
Temperature
Transceiver Supply
Voltage
DDVoltage
3.0
4.0
Tx Bias Current
Tx Output Power
Received Average
Power
DDBias
DDTxPower
DDRxPower
0
-10
-25
100
5
1
mA
dBm
dBm
Ó Finisar Corporation October 31, 2006 Rev C Preliminary
Page 6
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