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DRV8818_12 Datasheet, PDF (11/20 Pages) Texas Instruments – STEPPER MOTOR CONTROLLER IC | |||
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DRV8818
www.ti.com
FULL STEP
USM = 00
1/2 STEP
USM = 01
1
1
2
3
2
4
5
3
6
7
4
8
1/4 STEP
USM = 10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1/8 STEP
USM = 11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
SLVSAX9A â SEPTEMBER 2011 â REVISED FEBRUARY 2012
AOUTx
BOUTx
CURRENT
CURRENT
(% FULL-SCALE) (% FULL-SCALE)
100
0
98
20
92
38
83
56
71
71
56
83
38
92
20
98
0
100
â20
98
â38
92
â56
83
â71
71
â83
56
â92
38
â98
20
â100
0
â98
â20
â92
â38
â83
â56
â71
â71
â56
â83
â38
â92
â20
â98
0
â100
20
â98
38
â92
56
â83
71
â71
83
â56
92
â38
98
â20
STEP ANGLE
(DEGREES)
0
11.325
22.5
33.75
45 (home state)
56.25
67.5
78.75
90
101.25
112.5
123.75
135
146.25
157.5
168.75
180
191.25
202.5
213.75
225
236.25
247.5
258.75
270
281.25
292.5
303.75
315
326.25
337.5
348.75
RESETn, ENABLEn and SLEEPn Operation
The RESETn pin, when driven active low, resets the step table to the home position. It also disables the H-bridge
drivers. The STEP input is ignored while RESETn is active.
The ENABLEn pin is used to control the output drivers. When ENABLEn is low, the output H-bridges are
enabled. When ENABLEn is high, the H-bridges are disabled and the outputs are in a high-impedance state.
Note that when ENABLEn is high, the input pins and control logic, including the indexer (STEP and DIR pins) are
still functional.
The SLEEPn pin is used to put the device into a low power state. If SLEEPn is low, the H-bridges are disabled,
the gate drive charge pump is stopped, and all internal clocks are stopped. In this state all inputs are ignored
until the SLEEPn pin returns high.
Copyright © 2011â2012, Texas Instruments Incorporated
Product Folder Link(s): DRV8818
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