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Texas Instruments LM8330TME/NOPB
- Part No.:
- LM8330TME/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 25-WFBGA, DSBGA
- Datasheet:
-
LM8330TME/NOPB.pdf
- Description:
- IC INTFACE SPECIALIZED 25DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:596
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Product details
Overview
LM8330TME/NOPB from Texas Instruments is an I²C-compatible keypad controller and I/O expander with integrated 8×12 keypad scan, three programmable PWM outputs, 1.8V operation, ±8 kV IEC61000-4-2 ESD protection on KPX/KPY pins, and ultra-low-power HALT mode (1.5 µA typ). It serves as a dedicated host-offload device in compact portable electronics requiring robust key event handling and dynamic LED brightness control.
For engineers reviewing the LM8330TME/NOPB datasheet, LM8330TME/NOPB pinout, LM8330TME/NOPB application, or LM8330TME/NOPB equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for mobile keypad and GPIO expansion designs.
Technical Context
The LM8330TME/NOPB implements a register-based command interpreter communicating exclusively in I²C-compatible ACCESS.bus slave mode (100 kHz/400 kHz), with fixed 7-bit default address 0x88 and 10-bit address 0x088. Its internal 32 kHz oscillator eliminates external clock requirements.
Keypad scanning operates at 4 ms intervals with configurable debounce (12 ms typical) and settle time, supporting up to four simultaneous key presses stored in dedicated KBDCODE[3:0] registers and a 16-event FIFO. Three independent PWM timers-each with 31-command script buffer, auto-incrementing/decrementing duty cycle, and trigger chaining-run off the same 32 kHz reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.62 V to 1.98 V - Enables direct interface with 1.8 V system rails without level-shifting. |
| Operating Temperature | −30°C to +85°C - Qualified for consumer and industrial handheld environments. |
| Keypad Support | Up to 8×12 matrix + 8 SF keys - Provides full 104-key capability with flexible row/column assignment. |
| PWM Outputs | Three independent channels (PWM0–PWM2) - Enables synchronized RGB LED dimming or multi-zone backlight control. |
| ESD Protection | ±8 kV IEC61000-4-2 direct contact on KPX[7:0]/KPY[10:0] - Eliminates need for external TVS diodes on keypad lines. |
| HALT Current | 1.5 µA (typ) - Achieves battery-friendly idle state during keypad inactivity (default timeout: 1020 ms). |
| I²C Interface | Standard (100 kHz) and Fast Mode (400 kHz), 7-/10-bit addressing - Compatible with legacy and high-speed host controllers. |
Pinout & Package
LM8330TME/NOPB uses a 25-ball DSBGA package measuring 2.0 mm × 2.0 mm × 0.6 mm with 0.4 mm pitch. All balls are lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESETN | Active-low reset input | Asynchronous system-level reset; includes 50–100 ns glitch filter for noise immunity. |
| VCC | Core supply | 1.8 V ±10% single supply powering all logic, keypad scan, and PWM blocks. |
| SCL / SDA | I²C clock/data | Open-drain, 1.8 V-tolerant interface supporting standard/fast-mode timing and auto-increment register access. |
| KPX0–KPX7 | Keypad X-lines / GPIO0–7 | Configurable as row drivers or general-purpose inputs/outputs with programmable pullup/pulldown. |
| KPY0–KPY10 | Keypad Y-lines / GPIO8–18 / PWM0–2 | Column sense lines with dual GPIO/PWM function; KPY8/KPY11 share PWM2 (mutually exclusive). |
| IRQN | Interrupt output | Open-drain active-low signal asserting on key events, errors, or hardware interrupts per IRQST register status. |
| GND | Ground reference | Single ground ball providing return path for all internal circuits and I/Os. |
Key Features
| Feature | Design Value |
|---|---|
| 16-event keycode FIFO + 4-key multi-press storage | Enables reliable detection and buffering of rapid or concurrent key actions without host polling overhead. |
| 31-command PWM script buffer per channel | Allows autonomous LED fade, blink, or color-transition sequences without CPU intervention or timer interrupts. |
| On-chip power-on reset (POR) | Guarantees known initial pin states and register configuration after power-up or brownout recovery. |
| ASIP-integrated ESD protection | Provides certified ±8 kV contact discharge tolerance on all keypad I/Os, reducing BOM count and PCB area. |
| Configurable HALT wake-up sources | Permits selective wake-up from sleep via key press, IRQN edge, or I²C address match-no external wake signal needed. |
Applications
| Mobile Keypad Interface | QWERTY Keyboard Controller |
|---|---|
Use Scenario: Compact smartphone or feature phone with physical numeric keypad and soft-function keys. IC Role / Device Role / Timing Role: Dedicated keypad scanner and interrupt generator; replaces host CPU polling with event-driven IRQN signaling. Use Value: Reduces host processor load by >90% during idle, extends battery life via 1.5 µA HALT current, and ensures ESD-immune key detection in handheld drop environments. | Use Scenario: Handheld PDA or ruggedized terminal requiring alphanumeric QWERTY input with backlight control. IC Role / Device Role / Timing Role: Matrix scanner + GPIO expander + triple PWM driver; manages 8×12 key grid while modulating RGB LED backlight intensity. Use Value: Integrates three critical functions into one 2 mm × 2 mm package, eliminating discrete GPIO expanders and LED drivers while maintaining ±8 kV ESD robustness on all key lines. |
| Universal Remote Control | Industrial Keypad Terminal |
Use Scenario: Multi-protocol IR remote with customizable button layout and status LEDs. IC Role / Device Role / Timing Role: Keypad event processor and LED brightness controller; executes preloaded PWM scripts for smooth LED transitions during mode changes. Use Value: Enables visually responsive UI with zero host CPU cycles spent on LED timing-scripted fades and blinks run autonomously from 32 kHz internal clock. | Use Scenario: Factory-floor HMI panel exposed to electrostatic discharge and wide ambient temperature swings. IC Role / Device Role / Timing Role: Ruggedized I/O expander and key scanner; provides certified IEC61000-4-2 Level 4 ESD protection and −30°C to +85°C operation. Use Value: Eliminates field failures due to ESD-induced keypad lockup; guarantees reliable key registration even after repeated 8 kV contact discharges on KPX/KPY pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar keypad controller and I/O expansion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA6424A | 24-bit I²C GPIO expander only; no keypad scan engine, no PWM, no ESD hardening on I/Os. | Requires external firmware for key scanning; lacks integrated debounce, FIFO, or interrupt prioritization. | Select when only general-purpose I/O expansion is needed and keypad functionality is handled elsewhere. |
| MAX7359 | 8×10 keypad controller with 8 GPIOs and 2 PWMs; supports 2.5–5.5 V supply; ±4 kV IEC61000-4-2 ESD rating. | Higher voltage range enables direct 3.3 V/5 V integration but requires external level shifters for 1.8 V hosts. | Select for mixed-voltage systems where 1.8 V operation is not mandatory and lower ESD margin is acceptable. |
Compared with TCA6424A and MAX7359, LM8330TME/NOPB uniquely integrates keypad scanning, triple PWM, and ±8 kV IEC-rated ESD protection in a 2 mm × 2 mm package optimized for 1.8 V battery-powered devices-offering the highest functional density and environmental robustness for space-constrained portable interfaces.
Availability
LM8330TME/NOPB is available at Aetrix Electronics and suitable for mobile phones, QWERTY keyboards, universal remotes, and industrial keypad terminals requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LM8330TME/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM8330TME/NOPB belongs to TI's precision human-interface IC portfolio, engineered specifically to reduce host processor burden in portable devices through integrated keypad scanning, GPIO expansion, and autonomous LED control.
FAQ
What is the default I²C slave address for LM8330TME/NOPB?
The LM8330TME/NOPB defaults to a 7-bit I²C slave address of 0x88 and a 10-bit address of 0x088. These addresses are programmable via configuration registers, but the device powers up using these factory-set values. The upper three bits of the 10-bit address are hard-tied to zero, ensuring deterministic initialization without external strapping.
Does LM8330TME/NOPB require an external crystal or clock source?
No, LM8330TME/NOPB does not require an external clock source. It contains a fully integrated 32 kHz internal oscillator used for keypad scanning, PWM timing, and HALT mode control. This eliminates BOM cost and PCB footprint associated with crystals, capacitors, or clock generators-confirmed in the datasheet's "Internal Oscillator, No External Clock Required" feature list.
How many keys can LM8330TME/NOPB scan simultaneously, and how are multiple presses handled?
LM8330TME/NOPB supports up to four simultaneous key presses. Each press is stored in dedicated KBDCODE0–KBDCODE3 registers, with the MULTIKEY flag set in KBDCODE0 indicating additional presses. All events-including press/release sequences-are also captured in a 16-event FIFO accessible via the EVTCODE register, enabling lossless capture of rapid key activity without host polling.
What is the purpose of the ASIP technology on LM8330TME/NOPB's KPX and KPY pins?
The ASIP (Application Specific Integrated Passives) on LM8330TME/NOPB's KPX[7:0] and KPY[10:0] pins integrates robust ESD protection circuitry directly into the silicon, achieving ±8 kV IEC61000-4-2 contact discharge rating. This eliminates the need for external TVS diodes on keypad lines, reduces PCB area, improves reliability, and ensures consistent ESD performance across manufacturing lots-explicitly documented in the "ASIP ESD Protection" section of the datasheet.
Can LM8330TME/NOPB wake from HALT mode without external hardware intervention?
Yes, LM8330TME/NOPB can autonomously wake from HALT mode using internally generated events: key press/release on configured KPX/KPY lines, IRQN edge detection, or I²C address match. The wake-up source is configurable via registers such as WAKECFG, and no external wake pin or circuit is required-enabling true self-contained low-power operation as confirmed in the "Configurable Wake-Up from HALT Operation" feature list and HALT MODE section.
LM8330TME/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 25-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Cell Phone
- Interface:
- I2C
- Voltage - Supply:
- 1.62V ~ 1.98V
- Supplier Device Package:
- 25-DSBGA
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LM8330TME/NOPB FAQ
1.How can I place an order for LM8330TME/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM8330TME/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM8330TME/NOPB reliable?
The price and inventory of LM8330TME/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM8330TME/NOPB is usually 5 days.
3.What payment methods are accepted for LM8330TME/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM8330TME/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM8330TME/NOPB?
LM8330TME/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM8330TME/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM8330TME/NOPB?
For technical support, including LM8330TME/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM8330TME/NOPB requirements.
6.How does Aetrix verify that LM8330TME/NOPB is sourced from the original manufacturer or authorized distributors?
All LM8330TME/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM8330TME/NOPB meets industry standards.
7.What is the process for return or replacement of LM8330TME/NOPB?
All LM8330TME/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM8330TME/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM8330TME/NOPB part is unused and in its original packaging.
Return procedure for LM8330TME/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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