DRV8825 Datasheet, PDF (3/22 Pages) Texas Instruments – STEPPER MOTOR CONTROLLER IC

DRV8825
www.ti.com
SLVSA73C – APRIL 2010 – REVISED MAY 2011
Table 1. TERMINAL FUNCTIONS
NAME
PIN
POWER AND GROUND
GND
14, 28
VMA
4
VMB
11
V3P3OUT
15
CP1
1
CP2
2
VCP
3
CONTROL
nENBL
21
nSLEEP
17
STEP
22
DIR
20
MODE0
24
MODE1
25
MODE2
26
DECAY
19
nRESET
16
AVREF
12
BVREF
13
STATUS
nHOME
27
nFAULT
18
OUTPUT
ISENA
6
ISENB
9
AOUT1
5
AOUT2
7
BOUT1
10
BOUT2
8
I/O ⁽¹⁾
DESCRIPTION
-
Device ground
-
Bridge A power supply
-
Bridge B power supply
O
3.3-V regulator output
IO
Charge pump flying capacitor
IO
Charge pump flying capacitor
IO
High-side gate drive voltage
I
Enable input
I
Sleep mode input
I
Step input
I
Direction input
I
Microstep mode 0
I
Microstep mode 1
I
Microstep mode 2
I
Decay mode
I
Reset input
I
Bridge A current set reference input
I
Bridge B current set reference input
OD
Home position
OD
Fault
IO
Bridge A ground / Isense
IO
Bridge B ground / Isense
O
Bridge A output 1
O
Bridge A output 2
O
Bridge B output 1
O
Bridge B output 2
EXTERNAL COMPONENTS
OR CONNECTIONS
Connect to motor supply (8.2 - 45 V). Both
pins must be connected to same supply.
Bypass to GND with a 0.47-μF 6.3-V ceramic
capacitor. Can be used to supply VREF.
Connect a 0.01-μF 50-V capacitor between
CP1 and CP2.
Connect a 0.1-μF 16-V ceramic capacitor to
VM.
Logic high to disable device outputs and
indexer operation, logic low to enable. Internal
pulldown.
Logic high to enable device, logic low to enter
low-power sleep mode. Internal pulldown.
Rising edge causes the indexer to move one
step
Level sets the direction of stepping
MODE0 - MODE2 set the step mode - full,
1/2, 1/4, 1/8/ 1/16, or 1/32 step
Low = slow decay, open = mixed decay,
high = fast decay.
Internal pulldown and pullup.
Active-low reset input initializes the indexer
logic and disables the H-bridge outputs.
Internal pulldown.
Reference voltage for winding current set.
Normally AVREF and BVREF are connected
to the same voltage. Can be connected to
V3P3OUT.
Logic low when at home state of step table
Logic low when in fault condition (overtemp,
overcurrent)
Connect to current sense resistor for bridge A.
Connect to current sense resistor for bridge B.
Connect to bipolar stepper motor winding A.
Positive current is AOUT1 → AOUT2
Connect to bipolar stepper motor winding B.
Positive current is BOUT1 → BOUT2
(1) Directions: I = input, O = output, OZ = tri-state output, OD = open-drain output, IO = input/output
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