DRV8811 Datasheet, PDF (3/19 Pages) Texas Instruments – STEPPER MOTOR CONTROLLER IC

DRV8811
www.ti.com ................................................................................................................................................. SLVS865D – SEPTEMBER 2008 – REVISED JULY 2009
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
TERMINAL FUNCTIONS
I/O ⁽¹⁾
DESCRIPTION
EXTERNAL COMPONENTS OR CONNECTIONS
POWER AND GROUND
- Device ground
- Bridge A power supply
Connect to motor supply (8 V to 38 V). Both pins must be connected
to same supply.
- Bridge B power supply
Connect to motor supply (8 V to 38 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
IO Charge pump flying capacitor
Connect a 0.22-µF capacitor between CP1 and CP2
IO Charge pump flying capacitor
Connect a 0.22-µF capacitor between CP1 and CP2
IO High-side gate drive voltage
IO 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
I Enable input
Logic high to disable device outputs, logic low to enable outputs
I Sleep mode input
Logic high to enable device, logic low to enter low-power sleep mode
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
I Step input
Rising edge causes the indexer to move one step
I Direction input
Level sets the direction of stepping
I Microstep mode 0
USM0 and USM1 set the step mode - full step, half step, quarter
step, or eight microsteps/step
I Microstep mode 1
USM0 and USM1 set the step mode - full step, half step, quarter
step, or eight microsteps/step
I Reset input
Active-low reset input initializes the indexer logic and disables the
H-bridge outputs
I Sync. Rect. enable input
When active low, synchronous rectification is enabled
I Current set reference input
Reference voltage for winding current set
I Bridge A blanking and off time adjust Connect a parallel resistor and capacitor to GND - see motor driver
description for details
I 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
O Bridge A output 1
Connect to bipolar stepper motor winding A
O Bridge A output 2
Positive current is AOUT1 → AOUT2
O Bridge B output 1
Connect to bipolar stepper motor winding B
O Bridge B output 2
Positive current is BOUT1 → BOUT2
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
Copyright © 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): DRV8811
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