JSH-42L3AD3-20 JDS UNIPHASE, JSH-42L3AD3-20 Datasheet - Page 12

• Manufacturer Part Number: JSH-42L3AD3-20
• Manufacturer: JDS UNIPHASE

Specifications of JSH-42L3AD3-20

• Number Of Receivers: 1
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Operating Temperature (max): 85C
• Lead Free Status / Rohs Status: Compliant

JSH-42L3AD3-20S / 64P0682
LW 4x/2x/1x FC SFP with DDM
Two-wire Data Write
To write data to the Digital Diagnostic Monitoring data address of the device (writes are not allowed to the
Serial ID data address), the following sequence must occur on the Two-wire interface (refer to Two-Wire
Interface Figure 1 on page 13, Two-Wire Interface Figure 2 on page 13, and Two-Wire Interface Figure 3 on
page 13 throughout these steps):
A stop signal is presented by toggling the data line from low to high while the clock is high (see Two-Wire
Interface Figure 2 on page 13).
JDSU Product Specification 21121822-001
Page 12 of 45
1. Send a start signal to the module.
2. Send the data write sequence.
3. Receive an acknowledge signal.
4. Send the address of the first byte to be written during the subsequent sequence.
5. Receive an acknowledge signal.
6. Send a data byte.
7. Receive an acknowledge signal.
8. Send the next, consecutive data byte (reference Two-Wire Interface Figure 7 on page 14), or send a stop
A start signal is presented by toggling the data line from high to low while the clock is high (see Two-Wire
Interface Figure 2 on page 13).
The write data sequence consists of the bits 0b10100000 for the Serial ID data or 0b10100010 for the
Digital Diagnostic Monitoring information.
One zero bit is the acknowledge signal.
Valid byte addresses are 0b01101110 for one byte, and byte addresses 0b10000000 thorough
0b11110111.
signal to stop sending data (reference Two-Wire Interface Figure 6 on page 14).
October 2008