Datasheet

DRV8818
www.ti.com SLVSAX9C –SEPTEMBER 2011–REVISED NOVEMBER 2013
TERMINAL FUNCTIONS
NAME NO. I/O
(1)
DESCRIPTION EXTERNAL COMPONENTS OR CONNECTIONS
POWER AND GROUND
GND 7, 21 - Device ground
VMA 28 - Bridge A power supply
Connect to motor supply (8 V to 35 V). Both VMA and VMB must be
connected to same supply.
VMB 15 - Bridge B power supply
VCC 10 - Logic supply voltage Connect to 3-V to 5-V logic supply. Bypass to GND with a 0.1-μF
ceramic capacitor.
CP1 23 IO Charge pump flying capacitor Connect a 0.22-μF capacitor between CP1 and CP2.
CP2 24 IO Charge pump flying capacitor Connect a 0.22-μF capacitor between CP1 and CP2.
VCP 22 IO High-side gate drive voltage Connect a 0.22-μF ceramic capacitor to V
M
.
VGD 20 IO Low-side gate drive voltage Bypass to GND with a 0.22-μF ceramic capacitor.
CONTROL
ENABLEn 26 I Enable input Logic high to disable device outputs, logic low to enable outputs.
Weak internal pullup to VCC.
SLEEPn 27 I Sleep mode input Logic high to enable device, logic low to enter low-power sleep mode.
Weak internal pulldown.
DECAY 5 I 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 19 I Step input Rising edge causes the indexer to move one step. Weak internal
pulldown.
DIR 3 I Direction input Level sets the direction of stepping. Weak internal pulldown.
USM0 13 I Microstep mode 0 USM0 and USM1 set the step mode - full step, half step, quarter
step, or eight microsteps/step. Weak internal pulldown.
USM1 12 I Microstep mode 1 USM0 and USM1 set the step mode - full step, half step, quarter
step, or eight microsteps/step. Weak internal pulldown.
RESETn 17 I Reset input Active-low reset input initializes the indexer logic and disables the H-
bridge outputs. Weak internal pullup to VCC.
SRn 16 I Sync. Rect. enable input Active-low. When low, synchronous rectification is enabled. Weak
internal pulldown.
VREF 8 I Current set reference input Reference voltage for winding current set
RCA 6 I Bridge A blanking and off time adjust Connect a parallel resistor and capacitor to GND - see motor driver
description for details.
RCB 9 I Bridge B blanking and off time adjust Connect a parallel resistor and capacitor to GND - see motor driver
description for details.
ISENA 1 - Bridge A ground / Isense Connect to current sense resistor for bridge A
ISENB 14 - Bridge B ground / Isense Connect to current sense resistor for bridge B
OUTPUTS
AOUT1 4 O Bridge A output 1 Connect to bipolar stepper motor winding
AOUT2 25 O Bridge A output 2 Positive current is AOUT1 → AOUT2
BOUT1 11 O Bridge B output 1 Connect to bipolar stepper motor winding
BOUT2 18 O Bridge B output 2 Positive current is BOUT1 → BOUT2
HOMEn 2 O 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
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