DRV8818_12 Datasheet, PDF (3/20 Pages) Texas Instruments – STEPPER MOTOR CONTROLLER IC

DRV8818
www.ti.com
SLVSAX9A – SEPTEMBER 2011 – REVISED FEBRUARY 2012
NAME
GND
VMA
VMB
VCC
CP1
CP2
VCP
VGD
ENABLEn
SLEEPn
DECAY
STEP
DIR
USM0
USM1
RESETn
SRn
VREF
RCA
RCB
ISENA
ISENB
AOUT1
AOUT2
BOUT1
BOUT2
HOMEn
NO.
7, 21
28
15
10
23
24
22
20
26
27
5
19
3
13
12
17
16
8
6
9
1
14
4
25
11
18
2
I/O ⁽¹⁾
-
-
-
-
IO
IO
IO
IO
I
I
I
I
I
I
I
I
I
I
I
I
-
-
O
O
O
O
O
TERMINAL FUNCTIONS
DESCRIPTION
EXTERNAL COMPONENTS OR CONNECTIONS
POWER AND GROUND
Device ground
Bridge A power supply
Connect to motor supply (8 V to 35 V). Both pins must be connected
to same supply.
Bridge B power supply
Connect to motor supply (8 V to 35 V). Both pins must be connected
to same supply.
Logic supply voltage
Connect to 3-V to 5-V logic supply. Bypass to GND with a 0.1-μF
ceramic capacitor.
Charge pump flying capacitor
Connect a 0.22-μF capacitor between CP1 and CP2.
Charge pump flying capacitor
Connect a 0.22-μF capacitor between CP1 and CP2.
High-side gate drive voltage
Low-side gate drive voltage
Connect a 0.22-μF ceramic capacitor to V_M.
Bypass to GND with a 0.22-μF ceramic capacitor.
CONTROL
Enable input
Logic high to disable device outputs, logic low to enable outputs.
Weak internal pullup to VCC.
Sleep mode input
Logic high to enable device, logic low to enter low-power sleep mode.
Weak internal pulldown.
Decay mode select
Voltage applied sets decay mode - see motor driver description for
details. Bypass to GND with a 0.1-μF ceramic capacitor. Weak
internal pulldown.
Step input
Rising edge causes the indexer to move one step. Weak internal
pulldown.
Direction input
Level sets the direction of stepping. Weak internal pulldown.
Microstep mode 0
USM0 and USM1 set the step mode - full step, half step, quarter
step, or eight microsteps/step. Weak internal pulldown.
Microstep mode 1
USM0 and USM1 set the step mode - full step, half step, quarter
step, or eight microsteps/step. Weak internal pulldown.
Reset input
Active-low reset input initializes the indexer logic and disables the
H-bridge outputs. Weak internal pullup to VCC.
Sync. Rect. enable input
When active low, synchronous rectification is enabled. Weak internal
pulldown.
Current set reference input
Reference voltage for winding current set
Bridge A blanking and off time adjust Connect a parallel resistor and capacitor to GND - see motor driver
description for details.
Bridge B blanking and off time adjust Connect a parallel resistor and capacitor to GND - see motor driver
description for details.
Bridge A ground / Isense
Connect to current sense resistor for bridge A
Bridge B ground / Isense
Connect to current sense resistor for bridge B
OUTPUTS
Bridge A output 1
Connect to bipolar stepper motor winding
Bridge A output 2
Positive current is AOUT1 → AOUT2
Bridge B output 1
Connect to bipolar stepper motor winding
Bridge B output 2
Positive current is BOUT1 → BOUT2
Home position
Logic low when at home state of step table, logic high at other states
(1) Directions: I = input, O = output, OZ = 3-state output, OD = open-drain output, IO = input/output
Copyright © 2011–2012, Texas Instruments Incorporated
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