Texas Instruments FPC202RHUR

Overview

FPC202RHUR from Texas Instruments is a dual-port low-speed signal aggregator IC designed for SFP, QSFP, QSFP-DD, OSFP, and Mini-SAS HD port management. It integrates two independent downstream I²C masters (100/400 kHz per port), 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 28 ports via daisy-chained configurations in ToR switches and NICs.

For engineers reviewing the FPC202RHUR datasheet, FPC202RHUR pinout, FPC202RHUR application, or FPC202RHUR equivalent, key selection considerations include its 56-pin WQFN (11 mm × 5 mm) package with bottom-side placement capability, separate 1.8–3.3 V host I/O supply (VDD2), programmable LED blinking/dimming, and interrupt-driven event reporting - all critical for high-density optical module management without FPGA/CPLD overhead.

Technical Context

The FPC202RHUR implements dual independent port-side I²C master interfaces compliant with SFF-8431/8436/8449, each supporting full 7-bit address range and automatic pre-fetching of user-specified module registers. Its host interface dynamically selects between I²C Fast-mode Plus (1 MHz) and SPI (10 MHz) based on PROTOCOL_SEL pin state, with dedicated open-drain MOD_SCL/MOD_SDA pins per port and configurable CTRL[4:1] pins serving dual protocol roles.

It features four LED-specialized outputs per port (S0_OUT_C/D, S1_OUT_C/D) with hardware-assisted blinking/dimming, plus eight general-purpose I/Os (GPIO[3:0] and P*_S1_OUT_[A–D]) supporting 3.3 V LVCMOS logic referenced to VDD1. Interrupt generation is fully programmable via register-configurable events across both ports, and broadcast mode enables simultaneous writes to all cascaded FPC202RHUR devices.

Key Specifications

Pinout & Package

RHU package is a 56-pin, 0.4-mm pitch wettable flank QFN (11 mm × 5 mm) with exposed thermal pad (DAP) connected to GND. Designed for bottom-side PCB placement beneath 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 optical module control applications.

Compared with FPC402RHUR and MAX5980GTJ+, the FPC202RHUR uniquely balances dual-port aggregation, rich I/O (4 LED + 12 GPIO/port), and host interface flexibility - making it optimal for mid-density optical systems requiring both control fidelity and layout efficiency.

Availability

FPC202RHUR is available at Aetrix Electronics and suitable for ToR switches, NIC/HBA designs, wireless baseband units, and storage rack controllers requiring stable component supply, long-term lifecycle support, and qualified industrial-temperature operation.

Supply support for FPC202RHUR 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, communications, and computing markets.

The FPC202RHUR belongs to TI's port control and signal aggregation product line, engineered specifically to replace discrete logic and reduce FPGA I/O burden in high-speed optical interconnect systems - targeting network infrastructure with strict space, power, and reliability requirements.

FAQ

What host interface protocols does the FPC202RHUR support?

The FPC202RHUR supports two mutually exclusive host interface modes selected by the PROTOCOL_SEL pin: I²C (Inter-Integrated Circuit) up to 1 MHz Fast-mode Plus, or SPI (Serial Peripheral Interface) 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 FPC202RHUR does not support concurrent or auto-switching between protocols.

How many LED drivers and GPIOs does the FPC202RHUR provide per port?

The FPC202RHUR provides exactly four dedicated LED drivers (S0_OUT_C, S0_OUT_D, S1_OUT_C, S1_OUT_D) and twelve general-purpose I/Os per port. Of the twelve, four are bidirectional GPIOs (GPIO[3:0]), and eight are programmable outputs (P*_S0/S1_OUT_[A–D]). All LED drivers support hardware-programmable blink/dim timing and can sink up to 18 mA - confirmed in Section 6.5 Electrical Characteristics of the FPC202RHUR datasheet.

Can multiple FPC202RHUR devices be connected to a single host interface?

Yes, multiple FPC202RHUR devices can be daisy-chained or parallel-connected to a single host I²C or SPI interface. The FPC202RHUR supports broadcast mode, allowing a single write command to update identical registers across all connected devices. Up to 28 total ports can be managed using cascaded FPC202RHUR units - a capability explicitly documented in the FPC202RHUR datasheet Feature List and Section 7.3.4.

What is the purpose of the separate VDD2 supply on the FPC202RHUR?

VDD2 powers only the host-side interface I/Os (CTRL[4:1] and EN pins), enabling independent voltage scaling from 1.8 V to 3.3 V. This allows direct interfacing with low-voltage host controllers (e.g., 1.8 V FPGAs or MCUs) without external level shifters. VDD1 (3.3 V) remains dedicated to core logic and port-side I/Os. The FPC202RHUR datasheet specifies distinct VIH/VIL thresholds and leakage current limits for VDD2-referenced pins in Section 6.5.

Does the FPC202RHUR support hot-plug detection and interrupt generation?

Yes, the FPC202RHUR supports robust hot-plug detection via glitch-filtered port status inputs (e.g., P0_S0_IN_A/B/C with 30–50 µs pulse suppression) and programmable interrupt generation via HOST_INT_N. Critical events - including module insertion/removal, temperature alarms, and custom register threshold breaches - can be configured to trigger the open-drain active-low interrupt. This behavior is fully register-mapped and verified in Section 7.4 Device Functional Modes of the FPC202RHUR datasheet.