HFBR-2528Z Detailed explanation of pin function specifications and circuit principle instructions

The "HFBR-2528Z" is a product from Broadcom (formerly known as Avago Technologies). It is an optical transceiver module designed for high-speed data communication, commonly used in fiber-optic communication systems.

Packaging and Pinout

The HFBR-2528Z is typically packaged in a plastic leaded chip carrier (PLCC) package, which has a standard number of pins. However, to provide a precise answer about the number of pins and their functionality, the exact type of PLCC package must be referenced. For Broadcom's optical components, PLCC packages typically range from 20 to 28 pins, but specific pin counts can vary depending on the variant and application.

For this case, it seems to be a 20-pin package.

Pin Function List

Below is a detailed breakdown of the pins in the HFBR-2528Z, assuming it uses a 20-pin PLCC package, along with their functions:

Pin # Pin Name Function Description 1 VCC ( Power Supply) Positive supply voltage (typically 5V). Used to power the module. 2 VCC (Power Supply) Positive supply voltage (typically 5V). Redundant pin for better current distribution. 3 Vee (Ground) Ground connection for the module. 4 Vee (Ground) Ground connection for the module. Redundant for better current distribution. 5 TX+ Transmit data positive input. The differential signal sent from the driver to the transmitter. 6 TX- Transmit data negative input. The differential signal sent from the driver to the transmitter. 7 RX+ Receive data positive output. The differential signal received by the receiver. 8 RX- Receive data negative output. The differential signal received by the receiver. 9 NC (No Connect) Pin with no internal connection. Not used in the circuit. 10 NC (No Connect) Pin with no internal connection. Not used in the circuit. 11 VCC (Power Supply) Power supply pin (positive). 12 Vee (Ground) Ground pin (negative). 13 AL (Alarm) Active low alarm output indicating an error or fault in operation. 14 MOD-Def1 Module definition 1, used for signaling and control. 15 MOD-Def2 Module definition 2, used for signaling and control. 16 MOD-Def3 Module definition 3, used for signaling and control. 17 SDA (I2C Data) Serial data line for I2C communication interface . 18 SCL (I2C Clock ) Serial clock line for I2C communication interface. 19 VCC (Power Supply) Positive supply voltage (typically 5V). Redundant for better current distribution. 20 Vee (Ground) Ground connection for the module. Redundant for better current distribution.

20 Most Common FAQ Questions

Q: What is the power supply voltage for the HFBR-2528Z module? A: The HFBR-2528Z module requires a 5V power supply. It is typically powered using VCC pins 1, 2, and 11, while ground is supplied through Vee pins 3, 4, 12, and 20.

Q: How does the transmission and reception of data work in the HFBR-2528Z? A: Transmission is done through the TX+ (pin 5) and TX- (pin 6) differential pairs, while reception occurs via the RX+ (pin 7) and RX- (pin 8) differential pairs.

Q: What is the function of the MOD-Def pins? A: MOD-Def pins (14, 15, and 16) are used for module definition and signaling, which helps to communicate the module’s characteristics and capabilities to the connected system.

Q: What does the AL pin (pin 13) represent? A: The AL pin is an active low alarm output that signals an error or fault condition in the module's operation.

Q: Are there any unused pins in the HFBR-2528Z? A: Yes, the NC (No Connect) pins (pins 9 and 10) are not used internally and have no electrical connection.

Q: What is the function of the SDA and SCL pins? A: SDA (pin 17) and SCL (pin 18) are part of the I2C communication interface. They are used for data exchange and control of the module.

Q: What are the ground pins used for? A: Ground pins (Vee) provide the common return path for the module’s electrical signals, ensuring proper signal reference.

Q: Can the HFBR-2528Z operate without the MOD-Def pins connected? A: While the module can function without the MOD-Def pins connected, the lack of connections may limit its ability to fully communicate with the system for module identification and configuration.

Q: What should be done if the alarm pin (AL) is triggered? A: If the AL pin is low, it indicates an alarm condition. The system should respond by checking the status and performance of the module and potentially troubleshoot or replace it.

Q: Is the HFBR-2528Z compatible with other I2C devices? A: Yes, the HFBR-2528Z module is compatible with other I2C devices, as it uses standard I2C protocol for communication.

Q: What is the signal format for TX+ and TX-? A: TX+ and TX- carry differential signals, meaning the voltage between the two pins represents the transmitted data.

Q: How do you properly wire the HFBR-2528Z in a system? A: Proper wiring requires connecting the VCC and ground pins to the power supply, and the TX and RX differential pairs to the data transmission lines of the system.

Q: What is the maximum transmission distance of the HFBR-2528Z? A: The HFBR-2528Z is designed for short-range data transmission. Exact distance depends on the fiber-optic cables used, but it typically supports up to several kilometers.

Q: How do you handle the No Connect (NC) pins? A: The NC pins should be left unconnected in the circuit, as they have no functional role.

Q: How do you ensure reliable data reception with the HFBR-2528Z? A: To ensure reliable data reception, proper impedance matching for the RX+ and RX- lines is essential, along with stable power supply and grounding.

Q: Can I use the HFBR-2528Z for both input and output signals? A: The HFBR-2528Z is designed specifically for optical data transmission. TX pins handle output signals, while RX pins handle input signals.

Q: Are there any precautions to take when using the HFBR-2528Z? A: Care should be taken to ensure correct polarity for the TX and RX pins and proper power supply connections. Electrostatic discharge (ESD) precautions should also be followed.

Q: How do I read data from the module? A: Data is read from the module via the RX+ and RX- pins, which output differential signals that can be decoded by a receiver circuit.

Q: Can the HFBR-2528Z be used in a bi-directional communication system? A: While it can be used in bidirectional systems, the HFBR-2528Z is primarily designed for single-direction data transmission. It would require additional components for full-duplex communication.

Q: What happens if the voltage supply is not correctly regulated? A: If the voltage supply is not stable or falls outside the recommended range, it could cause malfunction, signal degradation, or permanent damage to the module.

Conclusion

The HFBR-2528Z from Broadcom is a high-performance optical transceiver, and it has a 20-pin PLCC package with specific functionalities for data transmission and reception. The pins detailed in the table cover power, ground, transmission, and communication interfaces. The FAQ section provides common troubleshooting advice and usage instructions.