NXP Semiconductors MC33689DDWBR2

Overview

MC33689DDWBR2 from NXP Semiconductors (formerly Freescale) is a SPI-controlled System Basis Chip (SBC) integrating a LIN 2.0 transceiver, 5.0 V/50 mA LDO regulator with fault reporting, three protected high-side switches (HS1/HS2: 150 mA PWM-capable; HS3: 50 mA), current sense op-amp, and dual high-voltage wake-up inputs - designed for automotive body electronics such as power window, mirror, and seat control modules.

For engineers reviewing the MC33689DDWBR2 datasheet, MC33689DDWBR2 pinout, MC33689DDWBR2 application, or MC33689DDWBR2 equivalent, key selection criteria include LIN bus compatibility up to 100 kbps, watchdog timing configurability via external resistor, thermal shutdown thresholds at 165°C, HS1/HS2 ON-resistance ≤ 4.5 Ω at 125°C, and diagnostic register accessibility via full-duplex SPI up to 4.0 MHz.

Technical Context

The MC33689DDWBR2 implements a multi-mode system controller with Normal, Sleep, and Stop operational states - enabling low-quiescent-current wake-up via LIN bus or external inputs (L1/L2) while maintaining diagnostics visibility. Its LIN physical layer supports programmable slew rate (normal/slow/fast) and waveshaping disable for higher data rates.

Internal architecture integrates SPI-managed mode control, window watchdog with ±15% accuracy using external R_EXT (10–100 kΩ), current-sense amplifier with rail-to-rail input (E+/E−), and independent protection logic per high-side switch including overtemperature latching and output current limiting (HS1/HS2: 300–600 mA; HS3: 60–200 mA).

Key Specifications

Pinout & Package

MC33689DDWBR2 is housed in a 32-pin SOICW (Wide-body Small Outline Integrated Circuit) package with exposed thermal pad (TGND pins at positions 8, 9, 24, 25) for enhanced thermal dissipation in automotive environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar system basis chip applications.

Compared with MC33689DDWBR2, MC33883DWBR2 expands communication scope at the expense of LIN-only simplicity and package size, while TLE9261-2QX trades current sense integration for lower cost and broader LIN version support - making MC33689DDWBR2 optimal for mid-tier automotive LIN slaves requiring embedded diagnostics and load monitoring.

Availability

MC33689DDWBR2 is available at Aetrix Electronics and suitable for automotive body control modules, power window ECUs, and mirror/seat actuation systems requiring stable component supply, AEC-Q100 qualification, and long-term industrial lifecycle support.

Supply support for MC33689DDWBR2 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications - with deep expertise in automotive-grade analog and mixed-signal ICs.

The MC33689DDWBR2 belongs to NXP's System Basis Chip portfolio, engineered specifically for LIN-based automotive body electronics to consolidate power regulation, communication, protection, and diagnostics into a single AEC-Q100 qualified device.

FAQ

What is the maximum LIN bus data rate supported by the MC33689DDWBR2?

The MC33689DDWBR2 supports LIN communication up to 100 kbps and is fully compliant with the LIN 2.0 specification. Its LIN transceiver includes configurable waveshaping circuitry that can be disabled to support higher data rates when required by system design - verified in the Electrical Characteristics section of the datasheet under "LIN transceiver capable to 100 kbps with waveshaping capability".

How does the watchdog timer on the MC33689DDWBR2 operate and how is it configured?

The MC33689DDWBR2 features a selectable timing window watchdog controlled via the WDC pin. A resistor (10–100 kΩ) connected between WDC and ground sets the timeout period from 10.6 ms to 215 ms, calculated as t_WDC = 0.991 × R + 0.648 (R in kΩ, t in ms). The watchdog provides ±15% accuracy and triggers a system reset if not refreshed within the window - critical for fail-safe operation in automotive body control units.

Can the high-side switches HS1 and HS2 on the MC33689DDWBR2 be used for PWM motor control?

Yes, HS1 and HS2 on the MC33689DDWBR2 support PWM operation via the dedicated IN pin. When IN is driven with a PWM signal, the internal AND logic gates HS1/HS2 activation to both the SPI control bit and the IN state - enabling precise duty-cycle control of resistive or inductive loads. This functionality is explicitly documented in the Functional Pin Description and Dynamic Electrical Characteristics sections of the datasheet.

What protection features are implemented for the high-side switches in the MC33689DDWBR2?

The MC33689DDWBR2 provides comprehensive protection for all three high-side switches: overcurrent limiting (HS1/HS2: 300–600 mA; HS3: 60–200 mA), thermal shutdown (latched off at 155–190°C), output clamping (HS1/HS2: -6.0 V), and leakage current monitoring (<10 μA). Fault conditions are reported via SPI-accessible status registers and the INT pin - ensuring robust operation in automotive environments with inductive loads.

Is the MC33689DDWBR2 qualified for automotive use and what temperature range does it support?

Yes, the MC33689DDWBR2 is AEC-Q100 qualified for automotive applications and operates across an ambient temperature range of -40°C to +125°C. Its junction thermal shutdown threshold is 165°C with pre-warning at 135°C, and it meets ISO 7637-2 transient immunity requirements on LIN, L1, and L2 pins - confirming suitability for under-hood and cabin-mounted body electronics modules.