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DRV8824 Datasheet(PDF) 3 Page - Texas Instruments |
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DRV8824 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 22 page DRV8824 www.ti.com SLVSA06E – OCTOBER 2009 – REVISED AUGUST 2011 Table 1. TERMINAL FUNCTIONS EXTERNAL COMPONENTS NAME PIN I/O(1) DESCRIPTION OR CONNECTIONS POWER AND GROUND GND 14, 28 - Device ground VMA 4 - Bridge A power supply Connect to motor supply (8 - 45 V). Both pins must be connected to same supply. VMB 11 - Bridge B power supply Bypass to GND with a 0.47- μF 6.3-V ceramic V3P3OUT 15 O 3.3-V regulator output capacitor. Can be used to supply VREF. CP1 1 IO Charge pump flying capacitor Connect a 0.01- μF 50-V capacitor between CP1 and CP2. CP2 2 IO Charge pump flying capacitor Connect a 0.1- μF 16-V ceramic capacitor to VCP 3 IO High-side gate drive voltage VM. CONTROL Logic high to disable device outputs and nENBL 21 I Enable input indexer operation, logic low to enable. Internal pulldown. Logic high to enable device, logic low to enter nSLEEP 17 I Sleep mode input low-power sleep mode. Internal pulldown. Rising edge causes the indexer to move one STEP 22 I Step input step. Internal pulldown. Level sets the direction of stepping. Internal DIR 20 I Direction input pulldown. MODE0 24 I Microstep mode 0 MODE0 - MODE2 set the step mode - full, MODE1 25 I Microstep mode 1 1/2, 1/4, 1/8/ 1/16, or 1/32 step. Internal pulldown. MODE2 26 I Microstep mode 2 Low = slow decay, open = mixed decay, DECAY 19 I Decay mode high = fast decay. Internal pulldown and pullup. Active-low reset input initializes the indexer nRESET 16 I Reset input logic and disables the H-bridge outputs. Internal pulldown. AVREF 12 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 BVREF 13 I Bridge B current set reference input V3P3OUT. A 0.01- µF bypass capacitor to GND is recommended. NC 23 No connect Leave this pin unconnected. STATUS nHOME 27 OD Home position Logic low when at home state of step table Logic low when in fault condition (overtemp, nFAULT 18 OD Fault overcurrent) OUTPUT ISENA 6 IO Bridge A ground / Isense Connect to current sense resistor for bridge A. ISENB 9 IO Bridge B ground / Isense Connect to current sense resistor for bridge B. AOUT1 5 O Bridge A output 1 Connect to bipolar stepper motor winding A. Positive current is AOUT1 → AOUT2 AOUT2 7 O Bridge A output 2 BOUT1 10 O Bridge B output 1 Connect to bipolar stepper motor winding B. Positive current is BOUT1 → BOUT2 BOUT2 8 O Bridge B output 2 (1) Directions: I = input, O = output, OZ = tri-state output, OD = open-drain output, IO = input/output Copyright © 2009–2011, Texas Instruments Incorporated 3 |
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