Texas Instruments FPC202RHUT

Overview

FPC202RHUT from Texas Instruments is a dual-port low-speed signal aggregator IC designed for SFP/QSFP/OSFP port management in networking hardware. It integrates two independent downstream I²C masters (100/400 kHz), 4 LED drivers + 12 GPIOs per port, and supports selectable I²C (up to 1 MHz) or SPI (up to 10 MHz) host interface - enabling centralized control of optical/electrical module status, power, and LEDs in ToR switches and NICs.

For engineers reviewing the FPC202RHUT datasheet, FPC202RHUT pinout, FPC202RHUT application, or FPC202RHUT equivalent, key selection criteria include its 56-pin WQFN package with bottom-side placement capability, dual-port I²C aggregation without discrete multiplexers, programmable LED blinking/dimming per port, and support for hot-plug-aware interrupt-driven monitoring across up to 28 ports via daisy-chained controllers.

Technical Context

The FPC202RHUT implements two independent port-side I²C master interfaces compliant with SFF-8431/SFF-8436/SFF-8449, each driving dedicated MOD_SCL/MOD_SDA busses to pluggable modules. Its host-side interface dynamically selects between I²C Fast-mode Plus (1 MHz) and SPI (10 MHz) via PROTOCOL_SEL pin strapping, with separate VDD2 supply (1.8–3.3 V) isolating host I/O voltage from 3.3-V VDD1 logic.

Each port provides four specialized LED outputs (S0_OUT_C/D, S1_OUT_C/D) with built-in dimming/blinking control and twelve general-purpose I/Os configurable as inputs (with weak pull-ups) or outputs - all managed through register-mapped memory accessible via the host interface. Interrupt generation is fully programmable per port event (e.g., ModPrsL, Tx_Fault, Rx_LOS).

Key Specifications

Pinout & Package

Package: RHU - 56-pin Wettable Flank Quad Flat No-lead (WQFN), 11 mm × 5 mm footprint, designed for bottom-side PCB placement under press-fit connectors to minimize trace length and routing congestion.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port pluggable module control applications.

Compared with FPC402RHUT and MAX5980GTJ+, the FPC202RHUT delivers optimal balance of port count, LED/GPIO resources, and programmable intelligence for mid-density optical interconnects - supporting both SFF and non-MSA modules while enabling bottom-side PCB placement.

Availability

FPC202RHUT is available at Aetrix Electronics and suitable for ToR switches, NIC/HBA designs, storage rack controllers, and wireless baseband units requiring stable component supply, long-term lifecycle support, and validated thermal performance in industrial ambient conditions.

Supply support for FPC202RHUT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and communications infrastructure markets.

The FPC202RHUT belongs to TI's pluggable module controller product line, engineered specifically to reduce system complexity in high-density optical interconnect systems by integrating I²C aggregation, LED control, and intelligent interrupt management into a single compact device.

FAQ

What host interface protocols does the FPC202RHUT support?

The FPC202RHUT supports two mutually exclusive host-side protocols selected by the PROTOCOL_SEL pin: I²C Fast-mode Plus (up to 1 MHz) or SPI (up to 10 MHz). In I²C mode, CTRL1–CTRL4 function as SCL, SDA, SET_ADDR_N, and ADDR_DONE_N; in SPI mode, they become SCK, SS_N, MOSI, and MISO. The FPC202RHUT does not support concurrent or auto-sensing operation between these interfaces.

How many LEDs can the FPC202RHUT drive per port, and what control features are available?

The FPC202RHUT provides four dedicated LED driver outputs per port (S0_OUT_C/D and S1_OUT_C/D), each capable of sinking up to 18 mA. These outputs support programmable blink frequency, duty cycle, and dimming intensity via internal registers - enabling precise status indication (e.g., link up/down, fault, activity) without external PWM circuitry. Each requires a minimum 33 Ω series resistor when driving standard LEDs.

Can multiple FPC202RHUT devices be synchronized for coordinated LED behavior?

Yes - when operating in SPI mode, the FPC202RHUT uses the SPI_LED_SYNC pin to align LED timing across multiple devices. All FPC202RHUT SPI_LED_SYNC pins must be tied together to ensure simultaneous blink/dim transitions. In I²C mode, synchronization is achieved implicitly via broadcast writes to identical register addresses, eliminating need for external sync signals.

What is the purpose of the EN pin on the FPC202RHUT, and what happens when it is asserted low?

The EN pin is an active-high enable input with weak internal pull-up. When pulled low, the FPC202RHUT enters full power-down mode: host interface (I²C/SPI) becomes unresponsive, port-side I²C masters halt all transactions, and all outputs enter high-impedance state. Power consumption drops to near-zero. A minimum 12.5 µs low pulse is required for reliable entry/exit from this state. The FPC202RHUT remains in reset until VDD1/VDD2 stabilize and TPOR (30–50 ms) elapses.

Does the FPC202RHUT support hot-plug detection for SFP/QSFP modules, and how is it implemented?

Yes - the FPC202RHUT supports hot-plug detection via dedicated low-speed input pins per port: P0_S0_IN_A/P1_S0_IN_A (ModPrsL), P0_S0_IN_B/P1_S0_IN_B (Tx_Fault), and P0_S0_IN_C/P1_S0_IN_C (Rx_LOS). These inputs feature built-in deglitch filtering (30–50 µs pulse suppression) and generate programmable interrupts to HOST_INT_N upon state change. Configuration is done via interrupt mask registers, allowing selective event reporting without host polling.