The X9522 is a laser diode controller for fiber optic modules. It combines three Digitally Controlled Potentiometers (DCPs) and two programmable voltage monitor inputs with software and hardware indicators. All functions of the X9522 are accessed by an industry standard 2-Wire serial interface. It can be used to control the bias and modulation currents of the laser diode in a fiber optic module, as well as monitor various module alarm levels.
The X9522 combines three Digitally Controlled Potentiometers (DCPs) and two programmable voltage monitors in a single 20‑lead TSSOP package. It is designed for laser diode bias and modulation control in fiber‑optic modules, offering non‑volatile storage, write‑protect, and hot‑pluggable operation.
The device is accessed via an industry‑standard 2‑wire (I²C‑compatible) serial interface. It supports programmable threshold voltages, dual voltage monitor outputs (V2RO, V3RO), and both volatile and non‑volatile write operations to the DCP wiper positions. Detailed pin assignments, command sequences, and timing diagrams are provided for integration.
| Number of DCPs | Three |
|---|---|
| Non‑volatile storage | Yes |
| Write protect function | Enabled when WP pin is HIGH |
| Serial interface | 2‑wire (I²C‑compatible) |
| Dual voltage monitors | Programmable threshold voltages |
| Supply voltage range | 2.7 V to 5.5 V |
| Hot‑pluggable | Yes |
| Package | 20‑lead TSSOP |
The device operates from a single supply voltage of 2.7 V to 5.5 V.