SLVS912J January   2009  – January 2016 DRV8821

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Dissipation Ratings
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 PWM Motor Drivers
      2. 7.3.2 Current Regulation
      3. 7.3.3 Blanking Time
      4. 7.3.4 Microstepping Indexer
      5. 7.3.5 xRESETn and xENBLn Operation
      6. 7.3.6 Protection Circuits
        1. 7.3.6.1 Overcurrent Protection (OCP)
        2. 7.3.6.2 Thermal Shutdown (TSD)
        3. 7.3.6.3 Undervoltage Lockout (UVLO)
        4. 7.3.6.4 Shoot-Through Current Prevention
    4. 7.4 Device Functional Modes
      1. 7.4.1 Decay Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Stepper Motor Speed
        2. 8.2.2.2 Current Regulation
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Bulk Capacitance
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
      1. 10.3.1 Power Dissipation
      2. 10.3.2 Heatsinking
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Pin Configuration and Functions

DCA Package
48-Pin HTSSOP
Top View
DRV8821 po_lvs912.gif

Pin Functions

PIN I/O(1) DESCRIPTION EXTERNAL COMPONENTS OR CONNECTIONS
NAME NO.
POWER AND GROUND
VM
(4 pins)		 1,2,
23, 24		 — Motor supply voltage (multiple pins) Connect all VM pins together to motor supply voltage.
Bypass each VM to GND with a 0.1-µF, 35-V ceramic capacitor.
V3P3 16 — 3.3 V regulator output Bypass to GND with 0.47-μF, 6.3-V ceramic capacitor.
GND 10-15,
34-39		 — Power ground (multiple pins) Connect all PGND pins to GND and solder to copper heatsink areas.
CP1 7 IO Charge pump flying capacitor Connect a 0.01-μF capacitor between CP1 and CP2
CP2 8 IO
VCP 9 IO Charge pump storage capacitor Connect a 0.1-μF, 16 V ceramic capacitor to VM
MOTOR AB
ABSTEP 45 I Motor AB step input Rising edge causes the indexer to move one step.
ABDIR 43 I Motor AB direction input Level sets the direction of stepping.
ABUSM0 44 I Motor AB microstep mode 0 USM0 and USM1 set the step mode - full step, half step, quarter step, or eight microsteps/step.
ABUSM1 41 I Motor AB microstep mode 1
ABENBLn 42 I Motor AB enable input Logic high to disable motor AB outputs, logic low to enable.
ABRESETn 40 I Motor AB reset input Active-low reset input initializes the indexer logic and disables the H-bridge outputs for motor AB.
ABDECAY 6 I Motor AB decay mode Logic low for slow decay mode, high for mixed decay.
ABVREF 17 I Motor AB current set reference voltage Sets current trip threshold.
AOUT1 5 O Bridge A output 1 Connect to first coil of bipolar stepper motor AB, or DC motor winding.
AOUT2 3 O Bridge A output 2
AISEN 4 — Bridge A current sense Connect to current sense resistor for bridge A.
BOUT1 48 O Bridge B output 1 Connect to second coil of bipolar stepper motor AB, or DC motor winding.
BOUT2 46 O Bridge B output 2
BISEN 47 — Bridge B current sense Connect to current sense resistor for bridge B.
MOTOR CD
CDSTEP 33 I Motor CD step input Rising edge causes the indexer to move one step.
CDDIR 31 I Motor CD direction input Level sets the direction of stepping.
CDUSM0 32 I Motor CD microstep mode 0 USM0 and USM1 set the step mode - full step, half step, quarter step, or eight microsteps/step.
CDUSM1 29 I Motor CD microstep mode 1
CDENBLn 30 I Motor CD enable input Logic high to disable motor CD outputs, logic low to enable.
CDRESETn 28 I Motor CD reset input Active-low reset input initializes the indexer logic and disables the H-bridge outputs for motor CD.
CDDECAY 19 I Motor CD decay mode Logic low for slow decay mode, high for mixed decay.
CDREF 18 I Motor CD current set reference voltage Sets current trip threshold.
COUT1 27 O Bridge C output 1 Connect to first coil of bipolar stepper motor CD, or DC motor winding.
COUT2 25 O Bridge C output 2
CISEN 26 — Bridge C current sense Connect to current sense resistor for bridge C.
DOUT1 22 O Bridge D output 1 Connect to second coil of bipolar stepper motor CD, or DC motor winding.
DOUT2 20 O Bridge D output 2
DISEN 21 — Bridge D current sense Connect to current sense resistor for bridge D.
(1) Directions: i = input, O = output, OZ = 3-state output, OD = open-drain ouput, IO = input/ouput