Texas Instruments TIC10024QDCPRQ1

Overview

TIC10024QDCPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to 125°C) automotive Multiple Switch Detection Interface (MSDI) IC that monitors up to 24 mechanical switch inputs in 12-V systems, supports 6 programmable wetting currents (0–15 mA), delivers ultra-low 68 μA polling-mode supply current, and interfaces directly to MCU via 3.3 V/5 V SPI - used in body control modules for reliable, low-power switch status reporting.

For engineers reviewing the TIC10024QDCPRQ1 datasheet, TIC10024QDCPRQ1 pinout, TIC10024QDCPRQ1 application, or TIC10024QDCPRQ1 equivalent, key selection criteria include wetting current configurability per input, ±24 V reverse-polarity tolerance, integrated comparator with four programmable thresholds, ISO-10605 ±8 kV ESD protection on inputs, and support for wake-up interrupt generation across all 24 channels.

Technical Context

The TIC10024QDCPRQ1 implements dual operational modes: continuous wetting current delivery for real-time monitoring and low-duty-cycle polling mode (64 ms interval, 128 μs active window) to reduce system power consumption. Its architecture integrates a pre-regulator, analog/digital LDOs, and independent current sources/sinks per input channel, enabling flexible ground- or battery-referenced switch detection.

It features a fully programmable SPI interface (up to 4 MHz) with CRC-enabled register access, hardware reset via dedicated /RESET pin, and fault detection logic for over-voltage (35–40 V), under-voltage (3.7–4.5 V), and over-temperature events - all signaled via open-drain /INT output with configurable assertion timing (1.5–2.5 ms).

Key Specifications

Pinout & Package

38-pin TSSOP package (9.70 mm × 4.40 mm), thermally enhanced with exposed pad (EP) connected to PCB ground for optimal thermal and ESD performance. Pin functions validated per TI SCPS268A datasheet Rev. FEBRUARY 2022.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiple switch detection interface applications.

Compared with TPS65381A-Q1 and MAX14919A, the TIC10024QDCPRQ1 uniquely delivers 24 fully configurable inputs with per-pin wetting current selection, AEC-Q100 Grade 1 operation, and integrated ±8 kV ISO-10605 ESD protection - making it the only option qualified for full-featured automotive BCM and gateway switch monitoring.

Availability

TIC10024QDCPRQ1 is available at Aetrix Electronics and suitable for body control modules, automotive lighting systems, and HVAC control units requiring stable component supply, long-term automotive lifecycle support, and guaranteed AEC-Q100 compliance.

Supply support for TIC10024QDCPRQ1 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 company specializing in analog, embedded processing, and automotive ICs, with decades of leadership in automotive electronics and functional safety design.

The TIC10024QDCPRQ1 belongs to TI's automotive switch detection interface product line, engineered specifically to replace discrete switch-sensing circuits in 12-V vehicle networks while meeting stringent AEC-Q100, ISO-26262, and EMC requirements.

FAQ

What is the maximum input voltage tolerance of the TIC10024QDCPRQ1, and how is it protected?

The TIC10024QDCPRQ1 withstands up to +40 V on VS and INx pins (load dump condition) and down to –24 V (reverse polarity), verified per AEC-Q100 stress testing. Protection is implemented via integrated ESD structures and internal clamping diodes - no external TVS required for basic compliance. For ISO-10605 ±8 kV contact discharge, external 15 nF/10 Ω RC network on each INx pin is mandatory per datasheet Figure 7-2.

How does the TIC10024QDCPRQ1 achieve ultra-low power consumption in polling mode?

The TIC10024QDCPRQ1 achieves 68 μA typical supply current in polling mode by activating wetting current only during precisely timed 128 μs sampling windows every 64 ms - reducing duty cycle to ~0.2%. This is controlled by an internal oscillator and state machine, eliminating MCU involvement during idle periods. All 24 inputs remain monitored, and /INT asserts immediately upon state change to wake the host MCU.

Can the TIC10024QDCPRQ1 monitor switches connected to battery (VBAT) instead of ground?

Yes - 10 of the 24 inputs (IN0–IN9) are configurable as either ground-referenced or battery-referenced (VBAT) switch monitors via register settings. This allows direct connection to 12-V loads like power seat motors or mirror actuators without external level-shifting circuitry. The remaining 14 inputs (IN10–IN23) are fixed ground-referenced.

What SPI interface voltage levels does the TIC10024QDCPRQ1 support, and how is logic compatibility ensured?

The TIC10024QDCPRQ1 supports 3.3 V or 5 V logic levels on its SPI interface (SCLK, SI, SO, /CS) via the VDD pin (3.0–5.5 V). Input thresholds scale with VDD (VIH = 0.7×VDD, VIL = 0.3×VDD), and SO output swing is rail-to-rail (VOH = 0.8×VDD, VOL = 0.2×VDD at 2 mA). This ensures interoperability with both 3.3 V and 5 V MCUs without level translators.

Does the TIC10024QDCPRQ1 provide built-in diagnostics, and how are faults reported?

Yes - the TIC10024QDCPRQ1 provides real-time diagnostics for over-voltage (35–40 V), under-voltage (3.7–4.5 V), and over-temperature conditions. Faults are reported via dedicated bits in the INT_STAT register and simultaneously asserted on the open-drain /INT pin. Each fault type has defined hysteresis (e.g., 1–3.5 V for OV) to prevent chatter during threshold crossings.