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Texas Instruments LM8333GGR8/NOPB
- Part No.:
- LM8333GGR8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Controllers
- Package:
- 49-TFBGA, CSPBGA
- Datasheet:
-
LM8333GGR8/NOPB.pdf
- Description:
- IC MOBILE I/O COMPANION 49-MIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,018
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Product details
Overview
LM8333GGR8/NOPB from Texas Instruments is a mobile I/O companion IC that offloads keypad scanning and provides I/O expansion, PWM generation, and ACCESS.bus (I²C-compatible) host interface for portable electronics. It supports up to 72-key matrix (8×8 standard + 8 special-function keys), features a 15-byte FIFO buffer, <2 µA standby current, and integrated watchdog timer with mandatory WD_OUT-to-RESET connection.
For engineers reviewing the LM8333GGR8/NOPB datasheet, LM8333GGR8/NOPB pinout, LM8333GGR8/NOPB application, or LM8333GGR8/NOPB equivalent, key selection considerations include its 32-pin WQFN package, 400 kHz I²C slave operation, programmable debounce/active timing, dual interrupt-capable GPIOs, and hardware-enforced Halt mode entry after inactivity.
Technical Context
The LM8333GGR8/NOPB implements a fully static architecture with an internal RC oscillator (nominally 1 MHz, ±30% variation) and automatic Halt mode entry after configurable inactivity (default 500 ms). Keypad scanning occurs at ~4 ms intervals, with hardware-based debounce and error detection for >2-key simultaneous press (KEYOVR) or FIFO overflow (FIFOOVR).
It operates as an I²C bus slave at up to 400 kHz using fixed 7-bit address 0xA2 (write)/0xA3 (read), supports host-programmable 16-bit PWM with 1 µs resolution, and requires WD_OUT connected to RESET due to mandatory watchdog functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.25 V to 2.9 V - defines minimum battery voltage for reliable operation in single-cell Li-ion or Li-poly systems |
| Standby Current | <2 µA - enables multi-month battery life in always-on handheld devices during idle periods |
| I²C Speed | Up to 400 kHz - supports fast host polling without requiring high-speed MCU peripherals |
| FIFO Depth | 15 bytes - buffers up to 14 key events plus termination code, preventing loss during host latency |
| Keypad Support | 8×8 matrix + 8 SF keys = 72 total - accommodates full QWERTY + function keys in compact PDA/mobile phone layouts |
| Debounce Time | Programmable 3–765 ms (steps of ~3 ms) - allows tuning for mechanical switch noise or membrane keypad variability |
| Active Mode Duration | Programmable 3–765 ms post-key-release - balances responsiveness vs. power by controlling scan window extension |
Pinout & Package
LM8333GGR8/NOPB is packaged in a 32-pin WQFN (5 mm × 5 mm, 0.5 mm pitch, package code NJE0032A), thermally enhanced with exposed thermal pad. Pin functions are validated per TI SNLS246K Rev. May 2013 datasheet.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| WAKE_IN0–WAKE_IN7 | Keyboard scan inputs / SF key wake sources | Eight dedicated inputs for row scanning or direct ground-triggered wake-up via special-function keys |
| K_OUT0–K_OUT7 | Keyboard scan outputs | Eight column drivers enabling full 8×8 matrix scanning; drive capability sufficient for capacitive or resistive keypads |
| GEN_IO_0–GEN_IO_3 | Configurable general-purpose I/O | Four bidirectional pins; GEN_IO_0/GEN_IO_1 support edge-triggered interrupts and wake-from-Halt |
| SDA / SCL | I²C data / clock | ACCESS.bus-compliant interface; SDA is open-drain, SCL is input-only - no internal pull-ups required |
| IRQ | Interrupt request output | Active-low open-drain signal asserting on key events, errors, or enabled GPIO transitions |
| PWM | Pulse-width modulated output | 16-bit programmable timer output; also usable as push-pull or tri-state GPIO when PWM disabled |
| WD_OUT | Watchdog timer output | Mandatory connection to system RESET; asserts low if host fails to service watchdog within timeout |
| RESET | Reset input | Asynchronous active-low reset; required for initialization and recovery from watchdog timeout |
| CLK_IN | RC oscillator timing input | Connect to GND via 68 kΩ resistor to set nominal 1 MHz internal clock; no external crystal needed |
| VCC / GND | Power / ground | Single 2.25–2.9 V supply; multiple GND pins ensure low-impedance return path for scanning currents |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Key Encoding | Automatic 8-bit event coding (MSB=1 for press, 0 for release) eliminates host-side matrix decoding logic |
| Programmable Halt Mode Entry | Host-configurable inactivity timeout (3–765 ms) ensures optimal power savings without sacrificing wake latency |
| Dual Interrupt-Capable GPIOs | GEN_IO_0 and GEN_IO_1 support rising/falling edge detection and wake-from-Halt - replaces discrete wake controllers |
| Integrated Watchdog Timer | Hardwired WD_OUT output forces system reset on host software hang - no external watchdog IC required |
| 15-Byte Event FIFO | Stores sequential key press/release codes with end-of-buffer marker (0x00), enabling robust host read sequencing |
Applications
| Mobile Phone Keypad Interface | PDA Function Key Management |
|---|---|
Use Scenario: Full alphanumeric keypad with navigation and soft keys in slim-form-factor cellular handsets. IC Role / Device Role / Timing Role: Offloads real-time scanning, debouncing, and event encoding from baseband processor; manages 72-key matrix including SF keys for power/voice control. Use Value: Reduces host CPU load by >90% during key activity and extends battery life via sub-2 µA standby current. | Use Scenario: Multi-layer menu navigation and application launch via physical buttons on legacy PDAs. IC Role / Device Role / Timing Role: Provides synchronized scan of 8×8 key grid plus 8 dedicated SF keys tied to WAKE_INx lines for instant wake-from-sleep. Use Value: Enables immediate system wake on any keypress without polling, meeting sub-100 ms response SLA. |
| Smart Handheld Media Player Controls | Personal Media Player UI Expansion |
Use Scenario: Volume, playback, and track navigation buttons on portable audio/video players. IC Role / Device Role / Timing Role: Host-programmable PWM drives LED backlight dimming; GEN_IO_2/GEN_IO_3 control status LEDs or vibration motor enable. Use Value: Integrates UI control, visual feedback, and haptic actuation into single chip - eliminates 3–5 discrete components. | Use Scenario: Compact media players requiring minimal BOM count and PCB area for button interface. IC Role / Device Role / Timing Role: Scans membrane keypad while providing four GPIOs for accessory detection (e.g., headset jack sense) and status signaling. Use Value: Achieves full UI functionality in <10 mm² footprint using only one 5×5 mm WQFN device. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I/O companion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA6408A | 8-bit I/O expander only; no keypad scanning, PWM, or watchdog; I²C up to 400 kHz | Lacks key encoding, FIFO, and SF key wake capability - requires host-side scan logic | Select when only GPIO expansion is needed and key scanning is handled elsewhere |
| PCA9555 | 16-bit I/O expander with interrupt output; no scanning engine, PWM, or watchdog; I²C up to 400 kHz | No built-in keypad support or event buffering - unsuitable for standalone key interface | Choose for higher pin count expansion where host has resources for custom scan firmware |
Compared with TCA6408A and PCA9555, LM8333GGR8/NOPB uniquely integrates hardware-accelerated key scanning, 15-byte FIFO buffering, programmable PWM, and mandatory watchdog - reducing host firmware complexity and component count in battery-constrained handhelds.
Availability
LM8333GGR8/NOPB is available at Aetrix Electronics and suitable for mobile phones, personal digital assistants, smart handheld devices, and personal media players requiring stable component supply across long-lifecycle consumer programs.
Supply support for LM8333GGR8/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 company delivering analog and embedded processing solutions, with leadership in low-power design and precision analog integration.
The LM8333 product line was designed specifically for power-optimized human-interface subsystems in portable electronics, combining keypad scanning, I/O expansion, and system supervision in a single chip.
FAQ
What is the required connection for WD_OUT on LM8333GGR8/NOPB?
The WD_OUT pin on LM8333GGR8/NOPB must be connected directly to the system RESET input. This is mandatory because the watchdog timer is always enabled in hardware; failure to connect WD_OUT to RESET prevents proper system recovery from software hangs and violates the device's operational requirement.
Does LM8333GGR8/NOPB support true I²C communication?
Yes, LM8333GGR8/NOPB implements a fully compliant I²C slave interface (ACCESS.bus compatible) operating at up to 400 kHz. It responds to fixed 7-bit address 0xA2 (write) / 0xA3 (read), supports repeated start conditions, and handles standard ACK/NACK protocols - verified in TI SNLS246K datasheet Section 6.
How many keys can LM8333GGR8/NOPB scan simultaneously without ambiguity?
LM8333GGR8/NOPB reliably scans up to two keys pressed simultaneously. Pressing three or more keys triggers the KEYOVR error flag and asserts IRQ, as the hardware cannot resolve ambiguous closure patterns in larger N-key rollover scenarios - this behavior is documented in the Error Code section of the datasheet.
What is the function of CLK_IN on LM8333GGR8/NOPB?
The CLK_IN pin on LM8333GGR8/NOPB connects to ground through a 68 kΩ resistor to configure the internal RC oscillator at nominally 1 MHz. No external clock source or crystal is required; this sets the timing reference for keypad scanning, debounce, and internal state machines per TI SNLS246K Section 8.3.
Can GEN_IO_2 and GEN_IO_3 on LM8333GGR8/NOPB be used as interrupt inputs?
No, only GEN_IO_0 and GEN_IO_1 on LM8333GGR8/NOPB support external interrupt configuration via the SET_EXT_INT command (0xD1). GEN_IO_2 and GEN_IO_3 are general-purpose I/Os without edge-detection circuitry or wake-from-Halt capability - confirmed in Signal Descriptions and I/O Expansion sections of the datasheet.
LM8333GGR8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 49-TFBGA, CSPBGA
- Programmable:
- Not Verified
- Protocol:
- -
- Function:
- Controller
- Interface:
- ACCESS.bus, I2C
- Standards:
- -
- Voltage - Supply:
- 2.25V ~ 2.9V
- Current - Supply:
- 6mA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 49-CSBGA (4x4)
- Grade:
- -
- Qualification:
- -
LM8333GGR8/NOPB FAQ
1.How can I place an order for LM8333GGR8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM8333GGR8/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 LM8333GGR8/NOPB reliable?
The price and inventory of LM8333GGR8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM8333GGR8/NOPB is usually 5 days.
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4.How is shipping managed for LM8333GGR8/NOPB?
LM8333GGR8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM8333GGR8/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 LM8333GGR8/NOPB?
For technical support, including LM8333GGR8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM8333GGR8/NOPB requirements.
6.How does Aetrix verify that LM8333GGR8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM8333GGR8/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 LM8333GGR8/NOPB meets industry standards.
7.What is the process for return or replacement of LM8333GGR8/NOPB?
All LM8333GGR8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM8333GGR8/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 LM8333GGR8/NOPB part is unused and in its original packaging.
Return procedure for LM8333GGR8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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