NXP Semiconductors SC16IS752IPW-T

Overview

SC16IS752IPW-T from NXP Semiconductors is a dual-channel UART IC with I²C-bus or SPI interface, enabling protocol conversion from I²C/SPI to RS-232/RS-485. It delivers up to 5 Mbit/s data rate, 64-byte TX/RX FIFOs per channel, and 8 programmable GPIOs. Designed for battery-powered industrial handhelds, it operates from 2.5 V or 3.3 V and supports −40 °C to +95 °C.

For engineers reviewing the SC16IS752IPW-T datasheet, SC16IS752IPW-T pinout, SC16IS752IPW-T application, or SC16IS752IPW-T equivalent, key selection criteria include dual UART channel independence, auto RTS/CTS hardware flow control, IrDA SIR support (up to 115.2 kbit/s), software reset capability, and TSSOP28 package compatibility with legacy 16C450 register mapping.

Technical Context

The SC16IS752IPW-T implements two fully independent UART channels sharing a single I²C or SPI master interface-selected via the I2C/SPI pin-and integrates a 16C450-compatible register set for seamless firmware porting. Its internal architecture includes separate 64-byte transmit and receive FIFOs per channel, programmable trigger levels (via FCR/TLR), and dedicated hardware logic for automatic RTS assertion/deassertion based on RX FIFO fill level.

It supports both Auto-CTS and Auto-RTS flow control independently enabled via EFR[7:6], with halt/resume thresholds configurable in the Transmission Control Register (TCR). Sleep mode activation requires EFR[4] and IER[4] set, and triggers only when RX is idle, TX FIFO/shift register is empty, and no pending interrupts except THR-achieving <30 µA sleep current at 3.3 V.

Key Specifications

Pinout & Package

SC16IS752IPW-T is housed in a TSSOP28 package (SOT361-1), 4.4 mm body width, 0.65 mm pitch, with exposed pad not present. Pin functions are validated per NXP Rev. 9 datasheet (2012), supporting both I²C and SPI configurations via shared pins (e.g., SDA/SO, SCL/SCLK) and mode-select logic on I2C/SPI pin.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual UART bridge applications.

Compared with SC16IS752IBS, SC16IS752IPW-T offers direct TSSOP28 drop-in replacement for legacy designs; compared with MAX3107ETJ+, it retains 16C450 compatibility and adds I²C support and IrDA SIR-critical for cost-sensitive, firmware-reuse-driven industrial upgrades.

Availability

SC16IS752IPW-T is available at Aetrix Electronics and suitable for industrial serial gateways, portable diagnostic tools, smart energy meter interfaces, and factory automation HMIs requiring stable component supply across long production lifecycles.

Supply support for SC16IS752IPW-T 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in interface and mixed-signal ICs.

The SC16IS752IPW-T belongs to NXP's serial interface bridge product line, designed specifically to simplify migration from parallel or legacy serial buses to modern I²C/SPI host architectures in resource-constrained embedded systems.

FAQ

What interface protocols does the SC16IS752IPW-T support?

The SC16IS752IPW-T supports I²C-bus (Fast Mode, up to 400 kbit/s) and SPI (slave only, up to 4 Mbit/s) as host-side interfaces. The I2C/SPI pin selects between them at power-up. It does not support UART-to-UART bridging or USB; its role is strictly I²C/SPI-to-dual-UART conversion. All register access and configuration occur over the selected bus, with no native UART host interface.

Does the SC16IS752IPW-T support RS-485 automatic direction control?

Yes, the SC16IS752IPW-T supports automatic RS-485 driver direction control using the RTS signal. When Auto-RTS is enabled (EFR[6]), RTS asserts when the RX FIFO has space and deasserts when full-directly driving the DE/RE pins of external RS-485 transceivers. This eliminates external logic or GPIO toggling, ensuring glitch-free half-duplex bus arbitration in SC16IS752IPW-T-based designs.

What is the maximum baud rate achievable with the SC16IS752IPW-T?

The SC16IS752IPW-T achieves up to 5 Mbit/s in 16× clock mode, assuming a 80 MHz input clock (e.g., from XTAL1). Baud rate is set via a 16-bit divisor in DLL/DLH registers. At lower clocks (e.g., 1.8432 MHz crystal), max baud is 115.2 kbit/s. The 5 Mbit/s rate is validated for clean signal integrity on short traces and is not dependent on the I²C or SPI host speed.

How does the SC16IS752IPW-T handle sleep mode entry and wake-up?

The SC16IS752IPW-T enters sleep mode when EFR[4] and IER[4] are set, RX is idle (no start bit detected), TX FIFO and shift register are empty, and only THR interrupt is pending. It wakes automatically on any RX activity (start bit edge) or IRQ assertion. Sleep current is <30 µA at 3.3 V. No external wake pin is required-the SC16IS752IPW-T self-manages entry/exit.

Is the SC16IS752IPW-T pin-compatible with the SC16IS762IPW-T?

No, the SC16IS752IPW-T and SC16IS762IPW-T are not pin-compatible. While both use TSSOP28, the SC16IS762IPW-T supports higher SPI clock speeds (15 Mbit/s vs. 4 Mbit/s) and IrDA SIR up to 1.152 Mbit/s (vs. 115.2 kbit/s), but shares identical pinout and register map. Hardware design can reuse the same PCB layout, but firmware must verify SPI timing margins and IrDA configuration before substitution.