DRV8821_16 Datasheet, PDF (3/32 Pages) Texas Instruments – Dual Stepper Motor Controller and Driver

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5 Pin Configuration and Functions
DRV8821
SLVS912J – JANUARY 2009 – REVISED JANUARY 2016
VM 1
VM 2
AOUT2 3
AISEN 4
AOUT1 5
ABDECAY 6
CP1 7
CP2 8
VCP 9
PGND 10
Solder these
pins to copper
heatsink area
PGND 11
PGND 12
PGND 13
PGND 14
PGND 15
V3P3 16
ABVREF 17
CDVREF 18
CDDECAY 19
DOUT2 ²⁰
DISEN ²¹
DOUT1 22
VM ²³
VM ²⁴
DCA Package
48-Pin HTSSOP
Top View
48 BOUT1
47 BISEN
46 BOUT2
45 ABSTEP
44 ABUSM0
43 ABDIR
42 ABENBLn
41 ABUSM1
40 ABRESETn
39 PGND
38 PGND
37 PGND
36 PGND
35 PGND
Solder these
pins to copper
heatsink area
34 PGND
33 CDSTEP
32 _CDUSM0
31 CDDIR
30 _CDENBLn
29 _CDUSM1
28 CDRESETn
27 _COUT1
26 CISEN
25 _COUT2
PIN
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
AOUT2
AISEN
5
O
3
O
4
—
Pin 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
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.
(1) Directions: i = input, O = output, OZ = 3-state output, OD = open-drain ouput, IO = input/ouput
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