DRV8824 Stepper Motor Controller IC

1 Features

PWM Microstepping Stepper Motor Driver
- Built-In Microstepping Indexer
- Up to 1/32 Microstepping
Multiple Decay Modes:
- Mixed Decay
- Slow Decay
- Fast Decay
8.2-V to 45-V Operating Supply Voltage Range
1.6-A Maximum Drive Current at 24 V and
T_A = 25°C
Simple STEP/DIR Interface
Low-Current Sleep Mode
Built-In 3.3-V Reference Output
Small Package and Footprint
Protection Features:
- Overcurrent Protection (OCP)
- Thermal Shutdown (TSD)
- VMx Undervoltage Lockout (UVLO)
- Fault Condition Indication Pin (nFAULT)

2 Applications

3 Description

The DRV8824 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. The output driver block consists of N-channel power MOSFETs configured as full H-bridges to drive the motor windings. The DRV8824 is capable of driving up to 1.6 A of current from each output (with proper heatsinking, at 24 V and 25°C).

A simple STEP/DIR interface allows easy interfacing to controller circuits. Mode pins allow for configuration of the motor in full-step up to 1/32-step modes. Decay mode is configurable so that slow decay, fast decay, or mixed decay can be used. A low-power sleep mode is provided which shuts down internal circuitry to achieve very-low quiescent current draw. This sleep mode can be set using a dedicated nSLEEP pin.

Internal shutdown functions are provided for overcurrent, short circuit, undervoltage lockout, and over temperature. Fault conditions are indicated through the nFAULT pin.

Device Information⁽¹⁾

PART NUMBER	PACKAGE	BODY SIZE (NOM)
DRV8824	HTSSOP (28)	9.70 mm × 6.40 mm
DRV8824	VQFN (28)	5.00 mm × 5.00 mm

(1) For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

Microstepping Current Waveform

4 Revision History

Changes from Revision J (July 2014) to Revision K (January 2022)

Updated RHD pinout Go
Added additional external component to connect to the VCP pin Go
Updated the Handling Ratings table to and ESD Ratings table and moved T_stg to the Absolute Maximum Ratings tableGo
Corrected device part number Go
Added Section 10.1 Go

Changes from Revision I (June 2014) to Revision J (July 2014)

Updated images on the front page Go
Update the continuous motor drive output current value in Absolute Maximum Ratings Go
Updated typical t_DEG time Go
Updated text and equations in Section 8.2.2 Go
Updated Section 9.1 and imageGo
Layout Example image updated. Go

Changes from Revision H (December 2013) to Revision I (June 2014)

Updated data sheet to new TI standard: added sections and rearranged material Go
Updated pin description for AVREF and BVREF Go
Added power supply ramp rate to Absolute Maximum Ratings Go
Added minimum voltage for V_IL and removed typicalGo
Updated parameter descriptions in Timing Requirements and t_WAKE minimum and maximum Go

Changes from Revision G (August 2013) to Revision H (December 2013)

Changed in Electrical Characteristics table, section DECAY INPUT third rowGo

5 Pin Configuration and Functions

Figure 5-1 PWP Package28-Pin HTSSOPTop View

Figure 5-2 RHD Package28-Pin VQFNTop View

Table 5-1 Pin Functions

PIN			I/O⁽¹⁾	DESCRIPTION	EXTERNAL COMPONENTS OR CONNECTIONS
NAME	PWP	RHD	I/O⁽¹⁾	DESCRIPTION	EXTERNAL COMPONENTS OR CONNECTIONS
POWER AND GROUND
GND	14, 28	3, 17	—	Device ground
VMA	4	7	—	Bridge A power supply	Connect to motor supply (8.2 to 45 V). Both pins must be connected to same supply, bypassed with a 0.1-µF capacitor to GND, and connected to appropriate bulk capacitance.
VMB	11	14	—	Bridge B power supply
V3P3OUT	15	18	O	3.3-V regulator output	Bypass to GND with a 0.47-μF 6.3-V ceramic capacitor. Can be used to supply VREF.
CP1	1	4	IO	Charge pump flying capacitor	Connect a 0.01-μF 50-V capacitor between CP1 and CP2.
CP2	2	5	IO	Charge pump flying capacitor	Connect a 0.01-μF 50-V capacitor between CP1 and CP2.
VCP	3	6	IO	High-side gate drive voltage	Connect a 0.1-μF 16-V ceramic capacitor. A 1-MΩ resistor can be connected to VM to accelerate discharge of the VCP capacitor.
CONTROL
nENBL	21	24	I	Enable input	Logic high to disable device outputs and indexer operation, logic low to enable. Internal pulldown.
nSLEEP	17	20	I	Sleep mode input	Logic high to enable device, logic low to enter low-power sleep mode. Internal pulldown.
STEP	22	25	I	Step input	Rising edge causes the indexer to move one step. Internal pulldown.
DIR	20	23	I	Direction input	Level sets the direction of stepping. Internal pulldown.
MODE0	24	27	I	Microstep mode 0	MODE0 through MODE2 set the step mode: full, 1/2, 1/4, 1/8/ 1/16, or 1/32 step. Internal pulldown.
MODE1	25	28	I	Microstep mode 1
MODE2	26	1	I	Microstep mode 2
DECAY	19	22	I	Decay mode	Low = slow decay, Open = mixed decay, High = fast decay. Internal pulldown and pullup.
nRESET	16	19	I	Reset input	Active-low reset input initializes the indexer logic and disables the H-bridge outputs. Internal pulldown.
AVREF	12	15	I	Bridge A current set reference input	Reference voltage for winding current set. Normally AVREF and BVREF are connected to the same voltage. Can be connected to V3P3OUT.
BVREF	13	16	I	Bridge B current set reference input
NC	23	26	—	No connect	Leave this pin unconnected.
STATUS
nHOME	27	2	OD	Home position	Logic low when at home state of step table
nFAULT	18	21	OD	Fault	Logic low when in fault condition (overtemperature, overcurrent)
OUTPUT
ISENA	6	9	IO	Bridge A ground / Isense	Connect to current sense resistor for bridge A.
ISENB	9	12	IO	Bridge B ground / Isense	Connect to current sense resistor for bridge B.
AOUT1	5	8	O	Bridge A output 1	Connect to bipolar stepper motor winding A. Positive current is AOUT1 → AOUT2
AOUT2	7	10	O	Bridge A output 2
BOUT1	10	13	O	Bridge B output 1	Connect to bipolar stepper motor winding B. Positive current is BOUT1 → BOUT2
BOUT2	8	11	O	Bridge B output 2

(1) Directions: I = input, O = output, OD = open-drain output, IO = input/output