Texas Instruments LM8330TMX/NOPB

Overview

LM8330TMX/NOPB from Texas Instruments is an I²C-compatible keypad controller and I/O expander with integrated 8×12 keypad scan, three programmable PWM outputs, ±8 kV IEC61000-4-2 ESD protection on KPX/KPY pins, and ultra-low-power HALT mode (1.5 µA typical). It operates from a single 1.8 V ±10% supply and targets compact handheld interfaces requiring reliable key event detection and LED brightness control.

For engineers reviewing the LM8330TMX/NOPB datasheet, LM8330TMX/NOPB pinout, LM8330TMX/NOPB application, or LM8330TMX/NOPB equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, confirmed alternative options, and supply-ready availability details - all grounded in TI's SNVS839A datasheet and official package documentation.

Technical Context

The LM8330TMX/NOPB implements a register-based command interpreter with auto-increment addressing, supporting both 7-bit (default 0x88) and 10-bit (0x088) I²C-compatible ACCESS.bus slave communication at up to 400 kHz. Its internal 32 kHz oscillator eliminates external timing components.

Keypad scanning runs autonomously at 4 ms intervals with configurable debounce (12 ms typical), 16-event FIFO buffering, and four-key simultaneous press support. Three independent PWM timers-each with a 31-command script buffer-enable self-sustaining LED modulation sequences without host intervention.

Key Specifications

Pinout & Package

LM8330TMX/NOPB uses a 25-ball lead-free DSBGA package measuring 2.0 mm × 2.0 mm × 0.6 mm with 0.4 mm pitch. All balls are arranged in a 5×5 grid; ball A1 is top-left corner per JEDEC MO-220 standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar keypad controller and I/O expander applications.

Compared with TCA6424A and PCA9557, LM8330TMX/NOPB uniquely integrates dedicated keypad scanning, three-channel PWM, and ±8 kV IEC ESD protection - eliminating host firmware overhead, external LED drivers, and discrete ESD components in space-constrained user-interface designs.

Availability

LM8330TMX/NOPB is available at Aetrix Electronics and suitable for mobile handsets, QWERTY keyboards, universal remotes, and industrial HMI panels requiring stable component supply, consistent DSBGA packaging, and long-term production continuity.

Supply support for LM8330TMX/NOPB 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 technologies, with decades of expertise in low-power interface solutions.

The LM8330TMX/NOPB belongs to TI's precision I/O expansion and human-interface controller product line, engineered specifically for battery-powered portable devices needing robust, integrated keypad and LED control in minimal footprint.

FAQ

What is the default I²C slave address for LM8330TMX/NOPB?

The LM8330TMX/NOPB defaults to a 7-bit I²C slave address of 0x88 and a 10-bit address of 0x088. These values are factory-programmed and can be reconfigured via the SLAVEADR register during initialization. The upper three bits of the 10-bit address are hard-tied to zero, ensuring compatibility with standard I²C controllers. This address setting is confirmed in TI's SNVS839A datasheet Section 7.3.2.

Does LM8330TMX/NOPB require an external crystal or clock source?

No, LM8330TMX/NOPB does not require an external clock source. It contains an internal 32 kHz oscillator used for keypad scanning and PWM timing, eliminating the need for external crystals, resonators, or clock generators. This internal reference is specified at 51.2–76.8 kHz across temperature and voltage, enabling fully self-contained operation. The oscillator is enabled automatically after power-on reset unless explicitly disabled via CLKEN register.

How many keys can LM8330TMX/NOPB scan simultaneously, and how is multi-key detection handled?

LM8330TMX/NOPB supports up to four simultaneous key presses. When multiple keys are pressed, the first key code appears in KBDCODE0, the second in KBDCODE1 (with MULTIKEY flag set in KBDCODE0), and subsequent keys fill KBDCODE2 and KBDCODE3. All events are also stored in the 16-deep EVTCODE FIFO with press/release flags. This hardware-accelerated multi-key handling avoids ghosting and ensures accurate chorded input detection without host-side matrix analysis.

What is the purpose of the ASIP structure on KPX and KPY pins in LM8330TMX/NOPB?

The ASIP (Application-Specific Integrated Passives) structure on KPX[7:0] and KPY[10:0] pins provides integrated ±8 kV IEC61000-4-2 direct-contact ESD protection, meeting Level 4 requirements without external components. This monolithic protection is built into the silicon die and verified per TI's characterization data in SNVS839A Section 6.3. It enables robust keypad interfacing in handheld devices where exposed buttons connect directly to these pins, reducing BOM count and PCB area.

Can LM8330TMX/NOPB operate in HALT mode while still responding to I²C commands?

Yes, LM8330TMX/NOPB remains fully accessible via I²C in HALT mode. While the internal RC oscillator stops to achieve 1.5 µA typical current draw, all registers remain readable and writable, and the device acknowledges its slave address on the bus. No wake-up sequence is required - the host may read status, update GPIO states, or reconfigure parameters without exiting HALT. This behavior is documented in SNVS839A Section 8.3 and enables true zero-latency host interaction during ultra-low-power operation.