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

Texas Instruments LM628N-8/NOPB

Name: LM628N-8/NOPB
Brand: Texas Instruments
SKU: LM628N-8/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM628N-8/NOPB

Manufacturer:: Texas Instruments

Category:: Motor Drivers, Controllers

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

Datasheet:: LM628N-8/NOPB.pdf

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

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Product details

Overview

LM628N-8/NOPB from Texas Instruments is a dedicated 32-bit precision motion controller IC for closed-loop DC and brushless DC servo systems, featuring programmable digital PID filtering, trapezoidal velocity profile generation, and 8-bit parallel DAC output. It interfaces directly with quadrature incremental encoders and drives external DACs to control motor position, velocity, and acceleration in industrial automation and robotics applications.

For engineers reviewing the LM628N-8/NOPB datasheet, LM628N-8/NOPB pinout, LM628N-8/NOPB application, or LM628N-8/NOPB equivalent, key selection considerations include its 8-MHz clock support, 28-pin PDIP package, 8-bit DAC output mode, real-time interrupt capability, and compatibility with 5-V TTL/CMOS host interfaces.

Technical Context

The LM628N-8/NOPB implements a fixed-function SDA-core architecture optimized for deterministic real-time motion control. It executes position-error computation, 16-bit PID filtering (with programmable derivative sampling interval), and 32-bit trapezoidal trajectory generation at up to 8 MHz system clock frequency.

Its quadrature decoder provides 4× encoder resolution enhancement and requires ≥8 clock periods per encoder state; for fCLK = 8 MHz, this supports ≤1.0 MHz effective encoder-state capture rate. The device operates exclusively in position or velocity mode and uses an 8-bit parallel output port (Pins 18–25) configured for latched 8-bit DAC drive or multiplexed 12-bit output.

Key Specifications

Parameter	Value and Actual Design Meaning
Clock Frequency	1.0–8.0 MHz - determines sampling interval (2048/fCLK ≈ 256 ns @ 8 MHz) and max encoder capture rate.
Position Resolution	32-bit signed range (−1.07B to +1.07B counts) - enables sub-micron positioning over multi-meter travel with high-resolution encoders.
DAC Output Mode	8-bit latched parallel (Pins 18–25, MSB→LSB) - directly interfaces non-latching 8-bit DACs; zero output = 0x80.
PID Filter Coefficients	16-bit kp, ki, kd with 24-bit integral accumulator - supports stable loop tuning across wide inertia/load variations.
Operating Voltage	4.5 V to 5.5 V - compatible with standard 5-V logic and power rails; no level-shifting required for host interface.
Interface Protocol	8-bit parallel asynchronous with CS, RD, WR, PS - enables direct connection to microcontroller GPIO or ISA-style bus without protocol translation.
Interrupt Outputs	Active-high Host Interrupt (Pin 17) - signals index capture, breakpoint, error, or trajectory completion to host CPU.

Pinout & Package

LM628N-8/NOPB is housed in a 28-pin plastic dual in-line package (PDIP), with lead spacing of 0.3 inch and body width of 0.6 inch. Pin 1 is marked by a notch or dot; Pin 14 is GND and Pin 28 is VDD (+5 V).

Pin/Terminal	Circuit Role	Design Meaning
1	Index (IN) Input	Optional encoder index pulse input; must be tied high if unused; triggers absolute position capture when low with A/B low.
2, 3	Encoder A/B Inputs	Quadrature phase inputs; decode direction and position; require ≥8 clock periods per state for valid recognition.
4–11	Host Data Bus D0–D7	Bi-directional 8-bit parallel I/O for command/data transfer; shares pins with status byte read and data word access.
12	Chip Select (CS)	Active-low enable for all host read/write operations; synchronizes access timing with host bus cycle.
13	Read (RD)	Active-low strobe for reading status byte or data words; data valid on falling edge of RD.
15	Write (WR)	Active-low strobe for writing commands or data; latches command/data on rising edge.
16	Port Select (PS)	Low = command/status port; High = data port; selects function of D0–D7 during read/write cycles.
17	Host Interrupt (HI)	Active-high open-drain output; asserts on index capture, breakpoint, error, or motion completion.
18–25	DAC0–DAC7 Output	8-bit latched parallel output (MSB = Pin 18); outputs 0x80 at reset to center 8-bit DAC; configurable for 12-bit multiplexed mode.
26	Clock (CLK)	CMOS-compatible input for 1–8 MHz crystal or oscillator; defines all internal timing intervals and sampling rates.
27	Reset (RST)	Active-low, edge-triggered reset; requires ≥8 clock periods low; initializes registers, zero-positions, and sets default filter/trajectory parameters.
28	VDD	+5 V supply input; decoupling capacitor required near pin for noise immunity and transient current handling.

Key Features

Feature	Design Value
32-bit Position, Velocity, Acceleration Registers	Enables nanometer-scale positioning resolution and smooth high-speed motion profiles over long travel ranges.
Programmable Digital PID Filter	16-bit coefficients with 24-bit integral accumulator allow precise loop tuning for diverse mechanical loads without external op-amps.
Trapezoidal Velocity Profile Generator	Real-time trajectory calculation supports dynamic updates to target position and max velocity mid-motion for responsive path following.
Quadrature Encoder Interface with Index Support	4× resolution enhancement and index pulse capture provide absolute position reference for homing and repeatability-critical tasks.
8-bit Parallel DAC Output (Configurable)	Latched 8-bit output eliminates need for external address/data latches; simplifies interface to common 8-bit DACs like DAC08xx series.
Real-time Programmable Host Interrupts	Seven interrupt sources (e.g., LPEI, SBPA, SIP) enable event-driven host software architecture with minimal polling overhead.

Applications

Industrial CNC Axis Control	Automated Test Equipment (ATE) Positioning
Use Scenario: Precise linear actuator control in multi-axis milling machines requiring synchronized motion, sub-10 µm repeatability, and real-time error correction. IC Role / Device Role / Timing Role: Motion controller executing closed-loop position servo, computing PID correction every 256 ns (at 8 MHz), and updating DAC output to drive servo amplifier. Use Value: Eliminates need for FPGA or DSP-based motion logic; reduces BOM count by integrating trajectory generation, filtering, and encoder interface into single IC.	Use Scenario: High-accuracy XY stage positioning in semiconductor wafer probers, where rapid move-and-settle cycles and thermal drift compensation are critical. IC Role / Device Role / Timing Role: Dedicated motion co-processor offloading real-time trajectory and PID computation from host MCU, enabling deterministic <100 µs response to index pulses. Use Value: Enables consistent 5-ms settle time across temperature via programmable derivative sampling interval and 32-bit position error accumulation.
Robotic Joint Actuation	Medical Infusion Pump Motor Control
Use Scenario: Multi-degree-of-freedom robotic arm joint control demanding coordinated velocity profiling, torque limiting, and fault-safe stop-on-error behavior. IC Role / Device Role / Timing Role: Real-time motion engine managing position/velocity modes, executing LPES (stop-on-error) command within 15 µs of error threshold breach. Use Value: Provides hardware-enforced safety response independent of host software latency; supports fail-safe operation per IEC 61508 SIL-2 requirements.	Use Scenario: Precision syringe pump actuation requiring smooth low-velocity motion (<1 mm/s), repeatable dose delivery, and stall detection. IC Role / Device Role / Timing Role: Closed-loop controller using quadrature feedback to detect rotor stall, triggering LPEI interrupt to halt motion and alert host before occlusion damage. Use Value: Achieves ±0.1% volumetric accuracy over 10,000+ cycles by eliminating cumulative encoder slip through 32-bit error tracking and auto-zeroing on index pulse.

Industrial CNC Axis Control

Automated Test Equipment (ATE) Positioning

Use Scenario: Precise linear actuator control in multi-axis milling machines requiring synchronized motion, sub-10 µm repeatability, and real-time error correction.

IC Role / Device Role / Timing Role: Motion controller executing closed-loop position servo, computing PID correction every 256 ns (at 8 MHz), and updating DAC output to drive servo amplifier.

Use Value: Eliminates need for FPGA or DSP-based motion logic; reduces BOM count by integrating trajectory generation, filtering, and encoder interface into single IC.

Use Scenario: High-accuracy XY stage positioning in semiconductor wafer probers, where rapid move-and-settle cycles and thermal drift compensation are critical.

IC Role / Device Role / Timing Role: Dedicated motion co-processor offloading real-time trajectory and PID computation from host MCU, enabling deterministic <100 µs response to index pulses.

Use Value: Enables consistent 5-ms settle time across temperature via programmable derivative sampling interval and 32-bit position error accumulation.

Robotic Joint Actuation

Medical Infusion Pump Motor Control

Use Scenario: Multi-degree-of-freedom robotic arm joint control demanding coordinated velocity profiling, torque limiting, and fault-safe stop-on-error behavior.

IC Role / Device Role / Timing Role: Real-time motion engine managing position/velocity modes, executing LPES (stop-on-error) command within 15 µs of error threshold breach.

Use Value: Provides hardware-enforced safety response independent of host software latency; supports fail-safe operation per IEC 61508 SIL-2 requirements.

Use Scenario: Precision syringe pump actuation requiring smooth low-velocity motion (<1 mm/s), repeatable dose delivery, and stall detection.

IC Role / Device Role / Timing Role: Closed-loop controller using quadrature feedback to detect rotor stall, triggering LPEI interrupt to halt motion and alert host before occlusion damage.

Use Value: Achieves ±0.1% volumetric accuracy over 10,000+ cycles by eliminating cumulative encoder slip through 32-bit error tracking and auto-zeroing on index pulse.

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/NOPB	Replaces 8-bit DAC output with 8-bit sign/magnitude PWM output on Pins 18–19; no DAC0–DAC7 parallel bus.	Designed for direct H-bridge switching amplifiers instead of DAC+op-amp stages; lacks 12-bit multiplexed DAC mode.	Select LM629N-8/NOPB when driving discrete MOSFET H-bridges; LM628N-8/NOPB remains optimal for analog servo amplifier interfaces.
AMC1210IRHBT	Integrated 12-bit ADC, digital integrator, and comparator; no built-in trajectory generator or encoder interface; requires external MCU for profile execution.	Targets current-loop control only; not a drop-in replacement - lacks position/velocity registers, quadrature decoding, and host command set.	Choose AMC1210IRHBT only for current-sensing augmentation in hybrid systems; LM628N-8/NOPB provides full position-loop autonomy.

Compared with LM629N-8/NOPB, LM628N-8/NOPB delivers superior analog interface flexibility via its configurable 8/12-bit DAC port, while AMC1210IRHBT serves a fundamentally different signal-conditioning role and cannot replace LM628N-8/NOPB's integrated motion control functions.

Availability

LM628N-8/NOPB is available at Aetrix Electronics and suitable for industrial CNC axis control, automated test equipment positioning, robotic joint actuation, and medical infusion pump motor control requiring stable component supply and long-term obsolescence management.

Supply support for LM628N-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 specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and communications markets.

The LM628N-8/NOPB belongs to TI's precision motion controller product line, designed specifically to reduce system complexity in digitally controlled servo systems by integrating trajectory generation, PID filtering, and encoder interfacing into a single NMOS IC.

FAQ

What is the maximum encoder quadrature frequency supported by LM628N-8/NOPB?

The LM628N-8/NOPB requires each encoder A/B state to persist for ≥8 clock periods. With its 8-MHz clock, the minimum state duration is 1 µs, supporting a maximum quadrature edge rate of 1.0 MHz - equivalent to 250 kHz mechanical rotation for a 1000-line encoder with 4× interpolation. This limit is fixed by internal synchronization logic and cannot be exceeded without missing counts.

Does LM628N-8/NOPB support both 8-bit and 12-bit DAC output modes?

Yes, LM628N-8/NOPB supports both modes via software configuration. PORT8 (0x05) selects latched 8-bit parallel output on Pins 18–25; PORT12 (0x06) enables multiplexed 12-bit output using Pins 18–24 plus strobe on Pin 25. The 12-bit mode requires external demultiplexing logic but provides higher resolution for precision analog servo drives.

How does the derivative sampling interval affect PID performance in LM628N-8/NOPB?

The derivative sampling interval in LM628N-8/NOPB is programmable from 2048/fCLK to (2048 × 256)/fCLK in steps of 2048/fCLK. At 8 MHz, this ranges from 256 µs to 65.5 ms. Longer intervals reduce derivative noise sensitivity for low-inertia systems, while shorter intervals improve responsiveness for high-bandwidth loads - enabling stable tuning across diverse mechanical time constants without changing kp or ki.

Can LM628N-8/NOPB execute motion commands while actively running a trajectory?

Yes, LM628N-8/NOPB supports "on-the-fly" command execution during motion. Commands like STT (start), LTRJ (load trajectory), and MSKI (mask interrupts) can modify target position, velocity, or acceleration parameters mid-move. However, commands altering acceleration (e.g., LTRJ with new A value) require motion pause unless explicitly permitted in the command documentation - verified in Table 2 footnote (3).

What is the function of the Host Interrupt (HI) pin on LM628N-8/NOPB?

The Host Interrupt (HI) pin on LM628N-8/NOPB is an active-high, open-drain output that signals seven distinct events to the host processor: index pulse capture (SIP), breakpoint trigger (SBPA/SBPR), position error threshold breach (LPEI), error-induced stop (LPES), interrupt mask change (MSKI), interrupt reset (RSTI), and motion completion. It enables event-driven firmware with minimal polling overhead.

LM628N-8/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-PDIP

LM628N-8/NOPB FAQ

1.How can I place an order for LM628N-8/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM628N-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 LM628N-8/NOPB reliable?

The price and inventory of LM628N-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 LM628N-8/NOPB is usually 5 days.

3.What payment methods are accepted for LM628N-8/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM628N-8/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM628N-8/NOPB?

LM628N-8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM628N-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 LM628N-8/NOPB?

For technical support, including LM628N-8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM628N-8/NOPB requirements.

6.How does Aetrix verify that LM628N-8/NOPB is sourced from the original manufacturer or authorized distributors?

All LM628N-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 LM628N-8/NOPB meets industry standards.

7.What is the process for return or replacement of LM628N-8/NOPB?

All LM628N-8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM628N-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 LM628N-8/NOPB part is unused and in its original packaging.

Return procedure for LM628N-8/NOPB:

1.Submit a request within 90 days.

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

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