DRV8821_15 Datasheet, PDF (3/23 Pages) Texas Instruments – DUAL STEPPER MOTOR CONTROLLER/DRIVER

DRV8821
www.ti.com
SLVS912I – JANUARY 2009 – REVISED JANUARY 2014
NAME
NO. I/O⁽¹⁾
POWER AND GROUND
VM
(4 pins)
1,2,
23, 24
-
V3P3
16
-
GND
10-15,
34-39
-
CP1
7
IO
CP2
8
IO
VCP
9
IO
MOTOR AB
ABSTEP
45
I
ABDIR
43
I
ABUSM0
44
I
ABUSM1
41
I
ABENBLn
42
I
ABRESETn 40
I
ABDECAY
6
I
ABVREF
17
I
AOUT1
5
O
AOUT2
3
O
AISEN
4
-
BOUT1
48
O
BOUT2
46
O
BISEN
47
-
MOTOR CD
CDSTEP
33
I
CDDIR
31
I
CDUSM0
32
I
CDUSM1
29
I
CDENBLn
30
I
CDRESETn 28
I
CDDECAY
19
I
CDREF
18
I
COUT1
COUT2
CISEN
DOUT1
DOUT2
DISEN
27
O
25
O
26
-
22
O
20
O
21
-
TERMINAL FUNCTIONS
DESCRIPTION
EXTERNAL COMPONENTS OR CONNECTIONS
Motor supply voltage (multiple pins)
3.3 V regulator output
Connect all VM pins together to motor supply voltage.
Bypass each VM to GND with a 0.1-µF, 35-V ceramic capacitor.
Bypass to GND with 0.47-μF, 6.3-V ceramic capacitor.
Power ground (multiple pins)
Connect all PGND pins to GND and solder to copper heatsink areas.
Charge pump flying capacitor
Charge pump storage capacitor
Connect a 0.01-μF capacitor between CP1 and CP2
Connect a 0.1-μF, 16 V ceramic capacitor to V_M
Motor AB step input
Motor AB direction input
Motor AB microstep mode 0
Motor AB microstep mode 1
Motor AB enable input
Motor AB reset input
Motor AB decay mode
Motor AB current set reference
voltage
Bridge A output 1
Bridge A output 2
Bridge A current sense
Bridge B output 1
Bridge B output 2
Bridge B current sense
Rising edge causes the indexer to move one step.
Level sets the direction of stepping.
USM0 and USM1 set the step mode - full step, half step, quarter
step, or eight microsteps/step.
Logic high to disable motor AB outputs, logic low to enable.
Active-low reset input initializes the indexer logic and disables the H-
bridge outputs for motor AB.
Logic low for slow decay mode, high for mixed decay.
Sets current trip threshold.
Connect to first coil of bipolar stepper motor AB, or DC motor
winding.
Connect to current sense resistor for bridge A.
Connect to second coil of bipolar stepper motor AB, or DC motor
winding.
Connect to current sense resistor for bridge B.
Motor CD step input
Motor CD direction input
Motor CD microstep mode 0
Motor CD microstep mode 1
Motor CD enable input
Motor CD reset input
Motor CD decay mode
Motor CD current set reference
voltage
Bridge C output 1
Bridge C output 2
Bridge C current sense
Bridge D output 1
Bridge D output 2
Bridge D current sense
Rising edge causes the indexer to move one step.
Level sets the direction of stepping.
USM0 and USM1 set the step mode - full step, half step, quarter
step, or eight microsteps/step.
Logic high to disable motor CD outputs, logic low to enable.
Active-low reset input initializes the indexer logic and disables the H-
bridge outputs for motor CD.
Logic low for slow decay mode, high for mixed decay.
Sets current trip threshold.
Connect to first coil of bipolar stepper motor CD, or DC motor
winding.
Connect to current sense resistor for bridge C.
Connect to second coil of bipolar stepper motor CD, or DC motor
winding.
Connect to current sense resistor for bridge D.
(1) Directions: I = input, O = output, OZ = 3-state output, OD = open-drain output, IO = input/output
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