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Texas Instruments LM629MX-8/NOPB
- Part No.:
- LM629MX-8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM629MX-8/NOPB.pdf
- Description:
- IC MOTOR DRIVER 4.5V-5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,430
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Product details
Overview
LM629MX-8/NOPB from Texas Instruments is a dedicated 8-bit PWM-based precision motion controller IC for brushless DC and servo motor systems. It integrates 32-bit position/velocity/acceleration registers, programmable digital PID filtering with 16-bit coefficients, internal trapezoidal velocity profile generation, and real-time host interrupt support. It operates with quadrature encoder feedback and delivers sign-magnitude PWM output directly to H-bridge drivers in industrial positioning stages.
For engineers reviewing the LM629MX-8/NOPB datasheet, LM629MX-8/NOPB pinout, LM629MX-8/NOPB application, or LM629MX-8/NOPB equivalent, key selection considerations include its 8 MHz clock capability, SOIC-24 package, 8-bit sign-magnitude PWM output architecture, -40°C to +85°C operating range, and compatibility with incremental encoder interfaces requiring index pulse support.
Technical Context
The LM629MX-8/NOPB implements an NMOS-based SDA-core motion processor executing real-time trajectory computation and digital PID control at up to 8 MHz clock frequency. Its quadrature decoder provides 4× resolution enhancement over encoder line count and enforces minimum 8-clock-period dwell per state for reliable edge capture.
It supports two distinct output modes: sign-magnitude PWM (Pins 18 & 19) for direct H-switch drive - with Pin 18 as sign and Pin 19 as magnitude - while Pins 20–25 remain unused. Derivative sampling interval is programmable from 256 μs to 65.536 ms (at 8 MHz), and filter coefficients are applied to a saturated 16-bit position error signal with 24-bit integral accumulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Clock Frequency | 1.0–8.0 MHz; enables 256 μs minimum derivative sampling interval and supports up to 1.0 MHz encoder-state capture rate. |
| Operating Temperature | −40°C to +85°C; qualified for industrial embedded motion control environments without derating. | Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V logic and analog supply rails. |
| PWM Output | 8-bit sign-magnitude (Pin 18 = sign, Pin 19 = magnitude); eliminates need for external DAC and directly drives gate drivers or H-bridges. |
| Position Resolution | 32-bit signed range (±1,073,741,823 counts); supports sub-micron positioning with high-line-count encoders. |
| Velocity Range | 0 to 16,383 counts/sample (16-bit fractional format); enables precise low-speed creep and high-acceleration moves. |
| Acceleration Range | 0 to 16,383 counts/sample² (16-bit fractional format); allows tunable mechanical response for diverse load inertias. |
Pinout & Package
LM629MX-8/NOPB is housed in a 24-pin SOIC package (Package Code M), with gull-wing leads, 0.65 mm pitch, and thermal pad not included. Pin numbering follows TI's standard SOIC-24 convention (Pin 1 = Index Input, Pin 24 = VDD).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Index) | Index Pulse Input | Optional home-position latch trigger; must be pulled high if unused; latches absolute position when Pins 1–3 are simultaneously low. |
| Pins 2, 3 (A, B) | Quadrature Encoder Inputs | Differential-phase signals decoded with 4× resolution gain; require ≥8 clock periods per state for valid transition detection. |
| Pins 4–11 (D0–D7) | Bi-directional Host Data Bus | 8-bit parallel interface for command/data transfer; synchronized via CS, PS, RD, WR control lines. |
| Pin 12 (CS) | Chip Select Input | Active-low enable for all host read/write operations; decouples LM629MX-8/NOPB from shared data bus. |
| Pin 13 (RD) | Read Strobe Input | Active-low signal initiating status byte or data word read; data valid during low pulse duration. |
| Pin 15 (WR) | Write Strobe Input | Active-low signal latching command or data bytes on rising edge; requires busy-bit polling before write. |
| Pin 16 (PS) | Port Select Input | Low = command port (status/RSTI/LFIL), High = data port (RDDP/RDRP/UDF); defines register access context. |
| Pin 17 (HI) | Host Interrupt Output | Active-high open-drain signal alerting host of breakpoint, error, or index events; requires external pull-up. |
| Pin 18 (SIGN) | PWM Sign Output | 8-bit sign bit (0 = positive torque, 1 = negative torque); drives H-bridge direction control directly. |
| Pin 19 (MAG) | PWM Magnitude Output | 8-bit magnitude value (0–255); combined with SIGN determines motor drive strength and polarity. |
| Pin 26 (CLK) | System Clock Input | Accepts TTL/CMOS-compatible 1–8 MHz clock; determines all timing intervals including derivative sampling and encoder capture. |
| Pin 27 (RST) | Reset Input | Active-low, edge-triggered reset requiring ≥8 clock cycles low; initializes position to zero, clears filters, and sets default parameters. |
| Pin 28 (GND) | Ground Reference | Primary power return; must be connected to clean, low-impedance system ground plane to minimize noise coupling into encoder/PWM paths. |
| Pin 24 (VDD) | Supply Voltage | +5 V ±10% power input; requires local 0.1 μF ceramic bypass capacitor placed within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Real-time Trapezoidal Profile Generation | Computes position vs. time trajectories on-the-fly using acceleration, max velocity, and target position inputs - enabling smooth, jerk-limited motion without host CPU overhead. |
| Programmable Digital PID Filter | 16-bit coefficient tuning (kp, ki, kd) with 24-bit integral accumulator and user-selectable derivative sampling interval - supports stable closed-loop control across wide inertia/load variations. |
| Quadrature Decoder with Index Support | 4× resolution enhancement over encoder line count plus optional index pulse capture - delivers absolute homing and high-accuracy position tracking in open-loop-coupled systems. |
| 8-bit Sign-Magnitude PWM Output | Dedicated Pins 18 (SIGN) and 19 (MAG) eliminate external DAC and simplify interface to discrete or integrated H-bridge drivers - reducing BOM count and layout complexity. |
| Asynchronous Host Interface | 8-bit parallel bus with CS/PS/RD/WR handshaking and busy-bit status flag - enables deterministic command execution and seamless integration with microcontrollers or FPGAs. |
Applications
| Industrial CNC Positioning Stage | Automated Test Equipment (ATE) Actuator |
|---|---|
|
Use Scenario: Precision linear stage moving under programmable acceleration profiles to position DUTs within ±1 µm repeatability. IC Role / Device Role / Timing Role: LM629MX-8/NOPB serves as the real-time motion engine, accepting host-set target positions and generating synchronized PWM drive signals while closing the loop on quadrature encoder feedback. Use Value: Enables sub-millisecond trajectory updates and deterministic interrupt-driven event handling (e.g., end-of-travel detection), eliminating jitter from host-software-based motion scheduling. |
Use Scenario: High-cycle-rate probe card actuator adjusting contact force and Z-height during wafer-level testing. IC Role / Device Role / Timing Role: LM629MX-8/NOPB executes velocity-mode motion with dynamic target updates, maintaining constant speed despite varying mechanical load while reporting real-time position via host-pollable registers. Use Value: Delivers consistent 600 rpm motor speed (±0.5%) across 10⁶+ cycles using only 8-bit PWM resolution - sufficient for force-controlled probing where analog DAC linearity is non-critical. |
| Medical Infusion Pump Drive | Lab Automation Liquid Handler |
|
Use Scenario: Stepper-less syringe pump requiring silent, low-vibration delivery at flow rates from 0.1 mL/hr to 100 mL/hr. IC Role / Device Role / Timing Role: LM629MX-8/NOPB runs in position mode with microstepping-equivalent resolution via high-line-count encoder, generating smooth trapezoidal velocity profiles to avoid pressure spikes. Use Value: Achieves <1% flow rate error across full range by leveraging 32-bit position registers and programmable PID gains - critical for dosage accuracy in IV therapy systems. |
Use Scenario: Multi-axis pipetting robot performing rapid tip pickup, aspiration, dispensing, and washing with coordinated motion. IC Role / Device Role / Timing Role: LM629MX-8/NOPB manages independent X/Y/Z axis motion using host-synchronized STT commands and reports real position (RDRP) and velocity (RDRV) for closed-loop coordination. Use Value: Reduces host CPU load by >70% versus software-based motion control - allowing single MCU to manage 4 axes while running GUI and communication stacks concurrently. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar motion controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM629N-8 | 28-pin PDIP package; identical electrical specs and firmware; no SOIC thermal performance advantage. | Preferred for prototyping or through-hole assembly; unsuitable for space-constrained PCBs. | Select LM629N-8 only when manual soldering or breadboard evaluation is required; LM629MX-8/NOPB is optimal for volume SMT production. |
| TMC4671-LA | Integrated 3-phase BLDC gate driver; SPI interface; 12-bit ADC for current sensing; no native quadrature decoder. | Requires external encoder interface logic; targets field-oriented control (FOC), not trapezoidal profiling. | Choose TMC4671-LA for torque-optimized servo systems with current feedback; LM629MX-8/NOPB remains superior for cost-sensitive, encoder-only position/velocity applications. |
Compared with LM629N-8, LM629MX-8/NOPB offers identical motion control functionality in a smaller SOIC-24 footprint with better thermal dissipation, while TMC4671-LA shifts architectural focus toward sensor-based FOC at the expense of quadrature-native simplicity and deterministic interrupt latency.
Availability
LM629MX-8/NOPB is available at Aetrix Electronics and suitable for industrial CNC positioning stages, automated test equipment actuators, medical infusion pump drives, and lab automation liquid handlers requiring stable component supply and long-term obsolescence management.
Supply support for LM629MX-8/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 founded in 1930, specializing in analog, embedded processing, and high-reliability silicon for industrial, automotive, and communications markets.
The LM629MX-8/NOPB belongs to TI's legacy precision motion controller product line, designed specifically for cost-effective, real-time digital servo systems using quadrature encoders and PWM-driven H-bridges - targeting applications where deterministic motion profiling outweighs advanced current-loop control needs.
FAQ
What is the maximum encoder quadrature frequency supported by LM629MX-8/NOPB?
The LM629MX-8/NOPB supports a maximum quadrature state capture rate of 1.0 MHz when operated at its 8 MHz clock frequency. This assumes each A/B encoder state persists for at least 8 clock cycles - a requirement enforced in hardware to prevent metastability and ensure robust edge detection in noisy industrial environments. The 4× resolution gain means a 250 kHz physical encoder output yields 1.0 MHz effective position update rate.
Does LM629MX-8/NOPB require an external DAC for motor drive?
No, LM629MX-8/NOPB does not require an external DAC. Unlike the LM628 variant, it features dedicated 8-bit sign-magnitude PWM outputs on Pins 18 (SIGN) and 19 (MAG), enabling direct connection to H-bridge gate drivers or integrated motor drivers. This eliminates DAC components, reduces analog noise sensitivity, and simplifies PCB layout - a key differentiator for cost-sensitive motion control designs.
Can LM629MX-8/NOPB execute motion commands while updating PID parameters?
Yes, LM629MX-8/NOPB supports real-time parameter updates during motion. Commands like LFIL (Load Filter Parameters) and LTRJ (Load Trajectory) can be issued "on the fly" without halting motion - provided acceleration values are not modified mid-move. This enables adaptive tuning, disturbance rejection, and dynamic target repositioning in closed-loop systems without introducing positional discontinuities or velocity overshoot.
What is the function of the Index (IN) input on LM629MX-8/NOPB?
The Index (IN) input on LM629MX-8/NOPB provides hardware-assisted homing capability. When Pins 1 (IN), 2 (A), and 3 (B) are simultaneously low, the device latches the current motor position into its index register and asserts the Host Interrupt (HI) output. This allows precise, repeatable absolute positioning without software-based search routines - essential for machine tools and pick-and-place systems requiring sub-millimeter repeatability.
How does LM629MX-8/NOPB handle reset synchronization and initialization?
LM629MX-8/NOPB requires a minimum 8-clock-cycle low pulse on Pin 27 (RST) to initiate hardware reset. Upon release, it zeroes filter coefficients, sets derivative sampling interval to 256 μs (at 8 MHz), initializes position to zero, and configures DAC outputs to "zero-torque" state (SIGN = 0, MAG = 0). Within 1.5 ms, the status byte changes from 00h to 84h/C4h - confirming successful reset. Executing RSTI command then verifies interrupt readiness by toggling Bit 6.
LM629MX-8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC) Servo, Brushed DC Servo
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (4)
- Interface:
- Parallel
- Technology:
- -
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
LM629MX-8/NOPB FAQ
1.How can I place an order for LM629MX-8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM629MX-8/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 LM629MX-8/NOPB reliable?
The price and inventory of LM629MX-8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM629MX-8/NOPB is usually 5 days.
3.What payment methods are accepted for LM629MX-8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM629MX-8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM629MX-8/NOPB?
LM629MX-8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM629MX-8/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 LM629MX-8/NOPB?
For technical support, including LM629MX-8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM629MX-8/NOPB requirements.
6.How does Aetrix verify that LM629MX-8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM629MX-8/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 LM629MX-8/NOPB meets industry standards.
7.What is the process for return or replacement of LM629MX-8/NOPB?
All LM629MX-8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM629MX-8/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 LM629MX-8/NOPB part is unused and in its original packaging.
Return procedure for LM629MX-8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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