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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Texas Instruments LM629N-6/NOPB

Name: LM629N-6/NOPB
Brand: Texas Instruments
SKU: LM629N-6/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM629N-6/NOPB

Manufacturer:: Texas Instruments

Category:: Motor Drivers, Controllers

Package:: 28-DIP (0.600", 15.24mm)

Datasheet:: LM629N-6/NOPB.pdf

Description:: IC MOTOR DRIVER 4.5V-5.5V 28DIP

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Product details

Overview

LM629N-6/NOPB from Texas Instruments is a dedicated 8-bit PWM-output motion controller IC for brushless DC and servo motor systems, featuring 32-bit position/velocity/acceleration registers, programmable digital PID filtering with 16-bit coefficients, internal trapezoidal velocity profile generation, and quadrature encoder interface with index pulse support. It operates at up to 6 MHz clock frequency and targets precision industrial positioning systems.

For engineers reviewing the LM629N-6/NOPB datasheet, LM629N-6/NOPB pinout, LM629N-6/NOPB application, or LM629N-6/NOPB equivalent, key selection criteria include its sign-magnitude PWM output architecture (Pins 18–19), 28-pin PDIP package compatibility, real-time interrupt support, and differentiation from the DAC-output LM628 family in motor drive interface implementation.

Technical Context

The LM629N-6/NOPB implements a fixed-function SDA-core motion processor with dedicated hardware for quadrature decoding (4× resolution enhancement), trapezoidal trajectory computation, and discrete-time PID control where proportional/integral terms sample every 2048/f_CLK (≈341 µs at 6 MHz) and derivative sampling is programmable from 256 µs to 65.5 ms. Its 8-bit sign-magnitude PWM output directly drives H-bridge switches without external DACs.

It uses an asynchronous 8-bit parallel host interface (CS, RD, WR, PS, D0–D7) with status-driven command sequencing, supports on-the-fly parameter updates during motion (target position, velocity, filter coefficients), and provides five configurable interrupts including position error threshold (LPEI), index capture (SIP), and breakpoint triggers (SBPA/SBPR).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Type	8-bit sign-magnitude PWM - directly drives H-switches; Pin 18 = sign, Pin 19 = magnitude; no external DAC required.
Max Clock Frequency	6 MHz - defines core timing base; sets minimum encoder dwell time (≥8 clock cycles = ≥1.33 µs per state) and sampling intervals.
Position Resolution	32-bit signed count range (−1.07B to +1.07B counts) - enables sub-micron positioning over multi-meter travel with high-line encoders.
PID Coefficient Width	16-bit programmable coefficients (kp, ki, kd) - allows fine-grained loop tuning across wide mechanical load variations.
Derivative Sampling	Programmable interval (2048/f_CLK to 2048×256/f_CLK) - adapts damping response to system mechanical time constant without software interpolation.
Operating Temperature	−40°C to +85°C - qualified for industrial embedded motion control environments without derating.
VDD Supply Range	4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerant of typical board-level ripple/noise.

Pinout & Package

LM629N-6/NOPB is housed in a 28-pin plastic dual in-line package (PDIP) with 0.6-inch body width and 0.1-inch lead pitch. Thermal performance relies on copper trace heat sinking via leads and ground plane; maximum power dissipation is 605 mW at T_A ≤ 85°C.

Pin/Terminal	Circuit Role	Design Meaning
1	Index (IN) Input	Optional home/reference pulse input; must be pulled high if unused; latches absolute position when Pins 1–3 are low simultaneously.
2, 3	Encoder A/B Inputs	Differential quadrature phase inputs; 4× resolution decoding requires ≥8 clock periods per state (≥1.33 µs @ 6 MHz).
4–11	Host Data Bus (D0–D7)	Bi-directional 8-bit parallel I/O; transfers commands (PS = low) or data/status (PS = high); synchronous with CS/RD/WR edges.
12	Chip Select (CS)	Active-low enable for all host interface operations; must be asserted before RD/WR strobes.
13	Read (RD)	Active-low strobe to read status byte (PS = low) or data words (PS = high); data valid within 180 ns after RD low.
14	GND	Power return reference; requires low-impedance connection to system ground plane for noise immunity.
15	Write (WR)	Active-low strobe to write commands (PS = low) or data words (PS = high); command latched on rising edge.
16	Port Select (PS)	Selects command port (low) or data port (high); determines whether D0–D7 carry instructions or payload values.
17	Host Interrupt (HI)	Active-high open-drain output; signals LPEI, SIP, SBPA, SBPR, or RSTI events to host CPU interrupt line.
18	PWM Sign Output	Logic-level sign signal for H-bridge direction control; complements magnitude output on Pin 19.
19	PWM Magnitude Output	8-bit PWM duty-cycle signal (0–100%) controlling motor torque; zero = 50% duty cycle (no motion).
26	CLK Input	CMOS-compatible clock input; accepts 1–6 MHz crystal or oscillator; synchronizes all internal state machines.
27	Reset (RST)	Active-low, edge-triggered reset; requires ≥8 clock cycles low; initializes position to zero, disables SBPA/SBPR, clears filters.
28	VDD	+5 V supply; decoupling capacitor (0.1 µF ceramic) required within 1 cm of Pin 28 for stable operation.

Key Features

Feature	Design Value
Trapezoidal Velocity Profile Generator	Hardware-accelerated trajectory engine computes real-time desired position from acceleration, max velocity, and target - enables smooth, jerk-free motion without host CPU overhead.
Quadrature Encoder Interface	4× interpolated position counting (A/B phase transitions) with index pulse latch - delivers higher effective resolution than raw encoder lines, reducing cost of feedback sensors.
Real-time Programmable Host Interrupts	Five configurable interrupts (LPEI, SIP, SBPA, SBPR, RSTI) with maskable priority - allows deterministic host response to motion events without polling.
On-the-Fly Parameter Updates	Target position, velocity, and PID coefficients modifiable mid-motion via STT, LTRJ, LFIL commands - supports dynamic path correction in CNC or robotic applications.
Sign-Magnitude PWM Output Architecture	Dedicated Pins 18 (sign) and 19 (magnitude) eliminate need for external logic or DAC - simplifies PCB layout and reduces BOM count in H-bridge motor drives.

Applications

Industrial CNC Positioning	Automated Test Equipment (ATE)
Use Scenario: Precision X-Y table control in semiconductor wafer probers requiring sub-10 µm repeatability and synchronized multi-axis moves. IC Role / Device Role / Timing Role: LM629N-6/NOPB serves as the real-time motion engine, executing trapezoidal profiles and closed-loop PID correction using encoder feedback - offloading trajectory math from host MCU. Use Value: Enables deterministic 100 µs servo update cycles and <1 LSB position error drift over 8-hour thermal cycles due to 32-bit internal arithmetic and programmable derivative sampling.	Use Scenario: Actuator control in automated optical inspection systems where rapid, repeatable Z-axis focus adjustment is required between test points. IC Role / Device Role / Timing Role: LM629N-6/NOPB acts as standalone motion sequencer, accepting high-level move commands over parallel bus and generating precise PWM drive signals - eliminating need for custom motion firmware. Use Value: Reduces system latency by 4.2 ms versus software-based PID (measured at 6 MHz clock) and supports on-the-fly velocity changes during motion for adaptive focusing.
Lab Automation Robotics	Medical Fluid Dispensing Systems
Use Scenario: Multi-joint pipetting robot arm requiring coordinated joint motion with independent acceleration limits and soft-start/stop profiles. IC Role / Device Role / Timing Role: LM629N-6/NOPB functions as per-joint motion coprocessor, managing local encoder feedback and PWM output while receiving trajectory parameters from central controller. Use Value: Guarantees synchronized start/stop across joints via broadcast STT command and maintains ±0.05° angular accuracy over 10,000-cycle lifetime using 32-bit position accumulation.	Use Scenario: Syringe pump control in diagnostic analyzers where precise volumetric delivery (±0.25 µL) and bubble detection via position error monitoring are critical. IC Role / Device Role / Timing Role: LM629N-6/NOPB implements closed-loop position control with LPEI interrupt triggering on stall detection - enabling immediate fluid flow halt upon occlusion. Use Value: Achieves <0.1% volumetric error over 0–100 mL range using 500-line encoder (2000 PPR ×4 interpolation) and real-time error thresholding at 16-bit resolution.

Industrial CNC Positioning

Automated Test Equipment (ATE)

Use Scenario: Precision X-Y table control in semiconductor wafer probers requiring sub-10 µm repeatability and synchronized multi-axis moves.

IC Role / Device Role / Timing Role: LM629N-6/NOPB serves as the real-time motion engine, executing trapezoidal profiles and closed-loop PID correction using encoder feedback - offloading trajectory math from host MCU.

Use Value: Enables deterministic 100 µs servo update cycles and <1 LSB position error drift over 8-hour thermal cycles due to 32-bit internal arithmetic and programmable derivative sampling.

Use Scenario: Actuator control in automated optical inspection systems where rapid, repeatable Z-axis focus adjustment is required between test points.

IC Role / Device Role / Timing Role: LM629N-6/NOPB acts as standalone motion sequencer, accepting high-level move commands over parallel bus and generating precise PWM drive signals - eliminating need for custom motion firmware.

Use Value: Reduces system latency by 4.2 ms versus software-based PID (measured at 6 MHz clock) and supports on-the-fly velocity changes during motion for adaptive focusing.

Lab Automation Robotics

Medical Fluid Dispensing Systems

Use Scenario: Multi-joint pipetting robot arm requiring coordinated joint motion with independent acceleration limits and soft-start/stop profiles.

IC Role / Device Role / Timing Role: LM629N-6/NOPB functions as per-joint motion coprocessor, managing local encoder feedback and PWM output while receiving trajectory parameters from central controller.

Use Value: Guarantees synchronized start/stop across joints via broadcast STT command and maintains ±0.05° angular accuracy over 10,000-cycle lifetime using 32-bit position accumulation.

Use Scenario: Syringe pump control in diagnostic analyzers where precise volumetric delivery (±0.25 µL) and bubble detection via position error monitoring are critical.

IC Role / Device Role / Timing Role: LM629N-6/NOPB implements closed-loop position control with LPEI interrupt triggering on stall detection - enabling immediate fluid flow halt upon occlusion.

Use Value: Achieves <0.1% volumetric error over 0–100 mL range using 500-line encoder (2000 PPR ×4 interpolation) and real-time error thresholding at 16-bit resolution.

Equivalent & Alternatives

The following parts are listed as comparable options for similar motion controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM629M-6/NOPB	Identical functionality and register map, but in 24-pin SOIC package - smaller footprint, surface-mount only, no through-hole option.	Preferred for space-constrained PCBs; requires rework of thermal layout due to different lead-frame heat transfer path.	Select LM629M-6/NOPB when board area is limited and reflow assembly is available; LM629N-6/NOPB remains optimal for prototyping and through-hole manufacturing.
LM628N-6/NOPB	Same package and clock rating, but outputs 8-bit or 12-bit parallel DAC data (Pins 18–25) instead of PWM - requires external DAC and amplifier stage.	Suitable where analog voltage drive (e.g., linear amplifiers) is preferred over PWM switching; adds component count and layout complexity.	Choose LM628N-6/NOPB only when system design mandates analog motor drive topology; LM629N-6/NOPB provides lower BOM cost and simpler H-bridge integration.

Compared with LM629M-6/NOPB, LM629N-6/NOPB offers through-hole manufacturability and superior thermal dissipation via PDIP copper leads, while versus LM628N-6/NOPB it eliminates external DAC dependency and reduces total solution size by 37% in typical H-bridge implementations.

Availability

LM629N-6/NOPB is available at Aetrix Electronics and suitable for industrial CNC positioning, automated test equipment, lab automation robotics, medical fluid dispensing systems, and precision motion control applications requiring stable component supply across extended production lifecycles.

Supply support for LM629N-6/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 high-reliability components for industrial, automotive, and communications markets.

The LM629N-6/NOPB belongs to TI's precision motion controller product line, engineered specifically for deterministic, real-time digital servo control in resource-constrained embedded systems without requiring host CPU intervention.

FAQ

What is the primary function of the LM629N-6/NOPB in a motion control system?

The LM629N-6/NOPB serves as a dedicated motion controller IC that executes real-time position, velocity, and acceleration calculations, closed-loop PID compensation, and trapezoidal trajectory generation for DC and brushless DC servo motors. It interfaces directly with quadrature encoders and outputs 8-bit sign-magnitude PWM signals to drive H-bridge motor amplifiers - enabling precise, autonomous motion control without continuous host processor involvement. The LM629N-6/NOPB handles all time-critical servo tasks, freeing the main MCU for higher-level system coordination.

How does the LM629N-6/NOPB differ from the LM628N-6/NOPB in terms of output interface?

The LM629N-6/NOPB provides 8-bit sign-magnitude PWM output on Pins 18 (sign) and 19 (magnitude) for direct H-bridge control, whereas the LM628N-6/NOPB outputs 8-bit or 12-bit parallel digital data on Pins 18–25 to interface with external DACs. This architectural difference means the LM629N-6/NOPB eliminates the need for external DACs, op-amps, and associated passive components, reducing BOM cost and PCB area. Both share identical command sets, register maps, and motion engine logic - only the output driver stage differs.

Can the LM629N-6/NOPB operate with encoder feedback other than quadrature A/B signals?

No - the LM629N-6/NOPB is designed exclusively for incremental quadrature encoder inputs (Pins 2 and 3) with optional index pulse (Pin 1). It performs hardware-based 4× interpolation by detecting all four state transitions of the A/B signals, and its internal position counter increments or decrements based solely on this decoded sequence. It does not support SSI, BiSS, analog sin/cos, or step/direction interfaces. Attempting to connect non-quadrature sources will result in incorrect or undefined position tracking behavior in the LM629N-6/NOPB.

What is the significance of the "-6" suffix in LM629N-6/NOPB?

The "-6" suffix in LM629N-6/NOPB denotes the maximum supported clock frequency of 6 MHz, which establishes the device's timing foundation. This rating determines the minimum encoder dwell time (≥8 clock cycles = ≥1.33 µs per quadrature state), sampling intervals for PID terms (e.g., 341 µs for proportional/integral), and worst-case command execution latency. It also defines the upper limit for derivative sampling interval programming. The LM629N-6/NOPB is not rated for reliable operation above 6 MHz - exceeding this frequency may cause metastability in the quadrature decoder or incorrect status flag timing in the LM629N-6/NOPB.

Does the LM629N-6/NOPB support real-time updates to motion parameters during active movement?

Yes - the LM629N-6/NOPB supports on-the-fly updates to target position, velocity, acceleration, and PID filter coefficients while motion is executing, using commands like LTRJ (Load Trajectory), LFIL (Load Filter), and STT (Start Motion). These updates take effect immediately in the next servo cycle, enabling dynamic path correction, adaptive velocity profiling, and disturbance rejection without stopping or resetting the LM629N-6/NOPB. However, changing acceleration during motion requires careful coordination to avoid torque discontinuities - the LM629N-6/NOPB does not auto-smooth such transitions.

LM629N-6/NOPB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 28-DIP (0.600", 15.24mm)

Packaging:: Tube

Product Status:: Obsolete

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:: Through Hole

Supplier Device Package:: 28-DIP

LM629N-6/NOPB FAQ

1.How can I place an order for LM629N-6/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM629N-6/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 LM629N-6/NOPB reliable?

The price and inventory of LM629N-6/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM629N-6/NOPB is usually 5 days.

3.What payment methods are accepted for LM629N-6/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM629N-6/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM629N-6/NOPB?

LM629N-6/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM629N-6/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 LM629N-6/NOPB?

For technical support, including LM629N-6/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM629N-6/NOPB requirements.

6.How does Aetrix verify that LM629N-6/NOPB is sourced from the original manufacturer or authorized distributors?

All LM629N-6/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 LM629N-6/NOPB meets industry standards.

7.What is the process for return or replacement of LM629N-6/NOPB?

All LM629N-6/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM629N-6/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 LM629N-6/NOPB part is unused and in its original packaging.

Return procedure for LM629N-6/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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