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DRV8818_12 Datasheet(数据表) 3 Page - Texas Instruments

部件型号  DRV8818
说明  STEPPER MOTOR CONTROLLER IC
下载  20 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
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DRV8818 Datasheet(HTML) 3 Page - Texas Instruments

 
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DRV8818
www.ti.com
SLVSAX9A
– SEPTEMBER 2011 – REVISED FEBRUARY 2012
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 pins must be connected
to same supply.
VMB
15
-
Bridge B power supply
Connect to motor supply (8 V to 35 V). Both pins must be connected
to same 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 VM.
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
When active 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
Copyright
© 2011–2012, Texas Instruments Incorporated
3




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