Data Sheet

ManualsBrandsPololu ManualsStepper Motor ControllersPololu Tic T500 USB Multi-Interface Stepper Motor Controller

STEP

Step Size

Decay Mode

8.2 to 45 V

Controller

+ -

DRV8825

1/32 µstep

Stepper

Motor Driver

2.5 A

DIR

nFAULT

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

DRV8825

SLVSA73F –APRIL 2010–REVISED JULY 2014

DRV8825 Stepper Motor Controller IC

1 Features 3 Description

The DRV8825 provides an integrated motor driver

• PWM Microstepping Stepper Motor Driver

solution for printers, scanners, and other automated

– Built-In Microstepping Indexer

equipment applications. The device has two H-bridge

– Up to 1/32 Microstepping

drivers and a microstepping indexer, and is intended

to drive a bipolar stepper motor. The output driver

• Multiple Decay Modes

block consists of N-channel power MOSFET’s

– Mixed Decay

configured as full H-bridges to drive the motor

– Slow Decay

windings. The DRV8825 is capable of driving up to

2.5 A of current from each output (with proper heat

– Fast Decay

sinking, at 24 V and 25°C).

• 8.2-V to 45-V Operating Supply Voltage Range

A simple STEP/DIR interface allows easy interfacing

• 2.5-A Maximum Drive Current at 24 V and

to controller circuits. Mode pins allow for configuration

= 25°C

of the motor in full-step up to 1/32-step modes. Decay

• Simple STEP/DIR Interface

mode is configurable so that slow decay, fast decay,

• Low Current Sleep Mode

or mixed decay can be used. A low-power sleep

mode is provided which shuts down internal circuitry

• Built-In 3.3-V Reference Output

to achieve very low quiescent current draw. This

• Small Package and Footprint

sleep mode can be set using a dedicated nSLEEP

• Protection Features

pin.

– Overcurrent Protection (OCP)

Internal shutdown functions are provided for

– Thermal Shutdown (TSD)

overcurrent, short circuit, under voltage lockout and

over temperature. Fault conditions are indicated via

– VM Undervoltage Lockout (UVLO)

the nFAULT pin.

– Fault Condition Indication Pin (nFAULT)

Device Information

(1)

2 Applications

PART NUMBER PACKAGE BODY SIZE (NOM)

• Automatic Teller Machines

DRV8825 HTSSOP (28) 9.70 mm × 6.40 mm

• Money Handling Machines

(1) For all available packages, see the orderable addendum at

• Video Security Cameras the end of the data sheet.

• Printers

• Scanners

• Office Automation Machines

• Gaming Machines

• Factory Automation

• Robotics

4 Simplified Schematic

Microstepping Current Waveform

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Summary of content (32 pages)

PAGE 1
Sample & Buy Product Folder Support & Community Tools & Software Technical Documents DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 DRV8825 Stepper Motor Controller IC 1 Features 3 Description • The DRV8825 provides an integrated motor driver solution for printers, scanners, and other automated equipment applications. The device has two H-bridge drivers and a microstepping indexer, and is intended to drive a bipolar stepper motor.
PAGE 2
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com Table of Contents 1 2 3 4 5 6 7 8 Features .................................................................. Applications ........................................................... Description ............................................................. Simplified Schematic............................................. Revision History..................................................... Pin Configuration and Functions ......................
PAGE 3
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 6 Pin Configuration and Functions Pin Functions PIN NAME NO. I/O (1) EXTERNAL COMPONENTS OR CONNECTIONS DESCRIPTION POWER AND GROUND CP1 1 I/O Charge pump flying capacitor CP2 2 I/O Charge pump flying capacitor GND 14, 28 — Device ground VCP 3 I/O High-side gate drive voltage VMA 4 — Bridge A power supply VMB 11 — Bridge B power supply V3P3OUT 15 O 3.
PAGE 4
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com Pin Functions (continued) PIN NAME nHOME NO. I/O (1) 27 OD AOUT1 5 AOUT2 EXTERNAL COMPONENTS OR CONNECTIONS DESCRIPTION Home position Logic low when at home state of step table O Bridge A output 1 7 O Bridge A output 2 Connect to bipolar stepper motor winding A. Positive current is AOUT1 → AOUT2 BOUT1 10 O Bridge B output 1 BOUT2 8 O Bridge B output 2 Connect to bipolar stepper motor winding B.
PAGE 5
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 7.4 Thermal Information DRV8825 THERMAL METRIC (1) PWP UNIT 28 PINS RθJA Junction-to-ambient thermal resistance (2) (3) 31.6 RθJC(top) Junction-to-case (top) thermal resistance RθJB Junction-to-board thermal resistance (4) 5.6 ψJT Junction-to-top characterization parameter (5) 0.2 ψJB Junction-to-board characterization parameter (6) 5.5 RθJC(bot) Junction-to-case (bottom) thermal resistance (7) 1.
PAGE 6
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com 7.5 Electrical Characteristics over operating free-air temperature range of –40°C to 85°C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT POWER SUPPLIES IVM VM operating supply current V(VMx) = 24 V 5 8 mA IVMQ VM sleep mode supply current V(VMx) = 24 V 10 20 μA 3.3 3.4 V 0.7 V 5.25 V V3P3OUT REGULATOR V3P3 V3P3OUT voltage IOUT = 0 to 1 mA 3.
PAGE 7
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 7.6 Timing Requirements MIN MAX UNIT 250 kHz 1 ƒSTEP Step frequency 2 tWH(STEP) Pulse duration, STEP high 1.9 μs 3 tWL(STEP) Pulse duration, STEP low 1.9 μs 4 tSU(STEP) Setup time, command before STEP rising 650 ns 5 tH(STEP) Hold time, command after STEP rising 650 ns 6 tENBL Enable time, nENBL active to STEP 650 ns 7 tWAKE Wakeup time, nSLEEP inactive high to STEP input accepted 1.7 ms Figure 1.
PAGE 8
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com 7.7 Typical Characteristics 7 14 6.5 12 IVMQ (PA) IVM (mA) 6 5.5 10 5 8 -40qC 25qC 85qC 125qC 4.5 4 10 15 20 25 30 V(VMx) (V) 35 40 6 10 45 -40qC 25qC 85qC 125qC 15 Figure 2. IVMx vs V(VMx) 35 40 45 D002 750 -40qC 25qC 85qC 125qC 700 RDS(ON) HS + LS (m:) 700 RDS(ON) HS + LS (m:) 25 30 V(VMx) (V) Figure 3.
PAGE 9
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 8 Detailed Description 8.1 Overview The DRV8825 is an integrated motor driver solution for bipolar stepper motors. The device integrates two NMOS H-bridges, current sense, regulation circuitry, and a microstepping indexer. The DRV8825 can be powered with a supply voltage between 8.2 and 45 V and is capable of providing an output current up to 2.5 A full-scale. A simple STEP/DIR interface allows for easy interfacing to the controller circuit.
PAGE 10
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com 8.2 Functional Block Diagram VM 3.3 V LS Gate Drive V3P3OUT CP1 Internal VCC V3P3OUT Charge Pump Low Side Gate Drive CP2 HS Gate Drive VM VCP 3.
PAGE 11
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 8.3 Feature Description 8.3.1 PWM Motor Drivers The DRV8825 contains two H-bridge motor drivers with current-control PWM circuitry. Figure 6 shows a block diagram of the motor control circuitry. Figure 6. Motor Control Circuitry Note that there are multiple VM motor power supply pins. All VM pins must be connected together to the motor supply voltage.
PAGE 12
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com Feature Description (continued) 8.3.2 Current Regulation The current through the motor windings is regulated by a fixed-frequency PWM current regulation, or current chopping. When an H-bridge is enabled, current rises through the winding at a rate dependent on the DC voltage and inductance of the winding. Once the current hits the current chopping threshold, the bridge disables the current until the beginning of the next PWM cycle.
PAGE 13
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 Feature Description (continued) Figure 7. Decay Mode The DRV8825 supports fast decay, slow decay and a mixed decay mode. Slow, fast, or mixed decay mode is selected by the state of the DECAY pin; logic low selects slow decay, open selects mixed decay operation, and logic high sets fast decay mode. The DECAY pin has both an internal pullup resistor of approximately 130 kΩ and an internal pulldown resistor of approximately 80 kΩ.
PAGE 14
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com Table 2 shows the relative current and step directions for different settings of MODEx. At each rising edge of the STEP input, the indexer travels to the next state in the table. The direction is shown with the DIR pin high; if the DIR pin is low the sequence is reversed. Positive current is defined as xOUT1 = positive with respect to xOUT2.
PAGE 15
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 Table 2.
PAGE 16
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com Table 2.
PAGE 17
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 8.3.6 nRESET, nENBL, and nSLEEP Operation The nRESET pin, when driven active low, resets internal logic, and resets the step table to the home position. It also disables the H-bridge drivers. The STEP input is ignored while nRESET is active. The nENBL pin is used to control the output drivers and enable/disable operation of the indexer. When nENBL is low, the output H-bridges are enabled, and rising edges on the STEP pin are recognized.
PAGE 18
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com 9 Application and Implementation 9.1 Application Information The DRV8825 is used in bipolar stepper control. The microstepping motor driver provides additional precision and a smooth rotation from the stepper motor. The following design is a common application of the DRV8825. 9.2 Typical Application DRV8825 V3P3OUT CP1 GND CP2 nHOME VCP MODE2 VMA MODE1 AOUT1 MODE0 10 k 0.01 µF 1 M 0.1 µF + 0.
PAGE 19
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 If the target motor startup speed is too high, the motor will not spin. Make sure that the motor can support the target speed or implement an acceleration profile to bring the motor up to speed.
PAGE 20
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com 9.2.3 Application Curves Figure 8. Microstepping Current (Phase A) vs STEP Input, Mixed Decay Figure 9. Microstepping Current (Phase A) vs STEP Input, Slow Decay on Increasing Steps Figure 10.
PAGE 21
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 10 Power Supply Recommendations The DRV8825 is designed to operate from an input voltage supply (VMx) range between 8.2 and 45 V. Two 0.1-µF ceramic capacitors rated for VMx must be placed as close as possible to the VMA and VMB pins respectively (one on each pin). In addition to the local decoupling caps, additional bulk capacitance is required and must be sized accordingly to the application requirements. 10.
PAGE 22
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com 11 Layout 11.1 Layout Guidelines The VMA and VMB pins should be bypassed to GND using low-ESR ceramic bypass capacitors with a recommended value of 0.1-μF rated for VMx. This capacitor should be placed as close to the VMA and VMB pins as possible with a thick trace or ground plane connection to the device GND pin. The VMA and VMB pins must be bypassed to ground using an appropriate bulk capacitor.
PAGE 23
DRV8825 www.ti.com SLVSA73F – APRIL 2010 – REVISED JULY 2014 Thermal Protection (continued) PTOT 4 u RDS(ON) u IOUT(RMS) 2 (5) where PTOT is the total power dissipation, RDS(ON) is the resistance of each FET, and IOUT(RMS) is the RMS output current being applied to each winding. IOUT(RMS) is equal to the approximately 0.7x the full-scale output current setting.
PAGE 24
DRV8825 SLVSA73F – APRIL 2010 – REVISED JULY 2014 www.ti.com 12 Device and Documentation Support 12.1 Trademarks PowerPAD is a trademark of Texas Instruments. 12.2 Electrostatic Discharge Caution These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 12.3 Glossary SLYZ022 — TI Glossary. This glossary lists and explains terms, acronyms, and definitions.
PAGE 25
PACKAGE OPTION ADDENDUM www.ti.
PAGE 26
PACKAGE OPTION ADDENDUM www.ti.com 12-Jun-2014 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PAGE 27
PACKAGE MATERIALS INFORMATION www.ti.com 12-Jun-2014 TAPE AND REEL INFORMATION *All dimensions are nominal Device DRV8825PWPR Package Package Pins Type Drawing SPQ HTSSOP 2000 PWP 28 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 330.0 16.4 Pack Materials-Page 1 6.9 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.2 1.8 12.0 16.
PAGE 28
PACKAGE MATERIALS INFORMATION www.ti.com 12-Jun-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) DRV8825PWPR HTSSOP PWP 28 2000 367.0 367.0 38.
PAGE 29
PAGE 30
PAGE 31
PAGE 32
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.