ALLEGRO A3980 User Manual
& Control Logic
R
R
A
A
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Automotive DMOS Microstepping Driver with Translator
SENSE1
SENSE2
OUT1
PFD
RC1
AGND
REF
RC2
VDD
OUT2
MS2
MS1
1
S
2
DI
3
4
5
PWM
6
7
÷
8
8
9
VDD
10
11
12
13
14
Package LP
Timer
Translator
Reg
VBB1
Charge
VBB2
Data Sheet
26184.26A
A3980
The A3980 is a complete microstepping motor driver with built-in
translator for easy operation. It is designed to operate bipolar stepper
motors in full-, half-, eighth-, and sixteenth-step modes, at up to 35 V
VBB1
28
SLEEP
27
ENABLE
26
OUT1B
25
CP2
24
CP1
23
Pump
VCP
22
PGND
21
VREG
20
STEP
19
OUT2B
18
FF2
17
FF1
16
VBB2
15
and ±1 A. The A3980 includes a fi xed off-time current regulator which
has the ability to operate in slow, fast, or mixed decay modes. This
results in reduced audible motor noise, increased step accuracy, and
reduced power dissipation.
The translator is the key to the easy implementation of the A3980.
Simply inputting one pulse on the step input drives the motor one
microstep. There are no phase sequence tables, high frequency control
lines, or complex interfaces to program. The A3980 interface is an ideal
fi t for applications where a complex µP is unavailable or overburdened.
Internal synchronous rectifi cation control circuitry is provided to
improve power dissipation during PWM operation.
Internal circuit protection includes: thermal shutdown with hysteresis,
overvoltage lockout (OVLO), undervoltage lockout (UVLO), and
crossover current protection. Special power-up sequencing is not
required. In addition, two diagnostic fault fl ags provide indication of
shorts or opens on the motor windings.
Approximate Scale 1:1
AB SO LUTE MAX I MUM RAT INGS
Load Supply Voltage, 500 ms,VBB.....................50 V
Logic Supply Voltage, V
Logic Input Voltage
V
(t
Sense Voltage, V
................................. –0.3 V to VDD + 0.3 V
IN
< 30 ns) ....................... –1.0 V to VDD + 1 V
W
SENSE
Reference Voltage, V
Package Power Dissipation (TA = +25ºC), P
"High-K" PCB1..............................R
Typical PCB
2
..................................R
Operating Temperature Range
Junction Temperature, T
Storage Temperature, TS..........–55°C to +150°C
1
Measured on a JEDEC-standard "High-K" 4-layer PCB.
2
Measured on a typical two-sided PCB with 3 in.2 copper
ground area.
................................7.0 V
DD
.......................................0.5 V
………............. 0 V to V
REF
D
28ºC/W
θJA
38ºC/W
θJA
...........–40°C to +150°C
J
DD
The A3980 is supplied in a low-profi le (1.1 mm) 28L TSSOP with
exposed thermal pad (part number suffi x LP).
FEATURES
Typical application up to ±1 A, 35 V output rating
Low R
outputs, 0.67 Ω source, 0.54 Ω sink typical
DS(ON)
Automatic current decay mode detection/selection
3.0 V to 5.5 V logic supply voltage range
Mixed, fast, and slow current decay modes
Synchronous rectifi cation for low power dissipation
Internal OVLO, UVLO, and thermal shutdown circuitry
Crossover current protection
Short to supply/ground and short/open load diagnostics
APPLICATIONS
Automotive stepper motors
Engine management
Headlamp positioning
Use the following complete part number when ordering:
Part Number Package Description
A3980KLP 28-pin, TSSOP Exposed thermal pad
5 V
RT1C
RT2C
VDD
STEP
DIR
MS1
MS2
RC1
T1
SR
SLEEP
ENABLE
PFD
RC2
T2
Automotive DMOS Microstepping Driver with Translator
Functional Block Diagram
C
CP
VREG
DAC
Translator
DAC
V
REF
SENSE 1
PWM Latch
Blanking
Mixed Decay
Control
Logic
PWM Latch
Blanking
Mixed Decay
SENSE 2
V
REF
Gate
Drive
DMOS Full Bridge
DMOS Full Bridge
OVLO
UVLO
OVERTEMP
SHORT SENSE
OPEN SENSE
CP2
Charge
Pump
Voltage
Regulator
VDD
VCP
VBB
OUT1A/1B
OUT2A/2B
SENSE1
SENSE2
CP1
VCP
VBB1
OUT1A
OUT1B
SENSE1
VBB2
OUT2A
OUT2B
SENSE2
RS2C
C
CS
R
C
S1
S1
S2
A3980
VBATT
Data Sheet
26184.26A
AGND
REF
FF1 FF2
PGND
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2
A3980
Automotive DMOS Microstepping Driver with Translator
Data Sheet
26184.26A
ELECTRICAL CHARACTERISTICS at T
Characteristics Symbol Test Conditions Min. Typ.1Max. Units
Output Drivers
Load Supply Voltage Range V
Output Leakage Current
Output-On Resistance R
Body Diode Forward Voltage V
Motor Supply Current I
Logic Supply Current I
2
I
DSON
Logic Interface
Logic Supply Voltage Range V
Input Low Voltage V
Input High Voltage V
Input Hysteresis V
Input Current
Output Low Voltage V
Output High Voltage V
STEP Pin Low t
STEP Pin High t
Setup Time for Input Change to STEP t
Hold Time for Input Change from STEP t
Wake-Up Time from SLEEP t
2
STPL
STPH
Continued on next page
= –40°C to +150ºC, V
J
Driving
Operating
BB
Sleep mode
V
= V
OUT
DSS
BB
DD
DD
IH
IHYS
I
IN
OL
OH
V
Source driver, I
Sink driver, I
Source driver, I
Sink driver, I
Source diode, IF = –1 A
F
Sink diode, IF = 1 A
f
PWM
Operating, outputs disabled
Sleep mode
f
PWM
Outputs off
Sleep mode
Operating 3.0 5.0 5.5 V
–––
IL
–
–
–
IO = 3 mA
IO = –200 µA 2.8
= 0 V
OUT
< 50 kHz
< 50 kHz
BB
–
–
MS1, MS2, DIR 200
SU
MS1, MS2, DIR 200
H
–––
EN
= 14 V, VDD = 3.0 to 5.5 V (unless otherwise noted)
BB
= –1 A, TA < 25ºC
OUT
= 1 A, TA < 25ºC
OUT
= –1 A, TA < 125ºC
OUT
= 1 A, TA < 125ºC
OUT
8
7
0
–
–
–
–
< 1.0
< 1.0
0.51
0.45
0.87
0.72
––
––
––
0.7 V
DD
200 300 500 mV
–20 < ±1 20 µA
––
––
V
OVB
50
35
20
–20
0.86
0.65
1.06
0.83
1.4
1.4
8
6
20
12
10
20
0.3 V
DD
0.4 V
––
1
1
––
––
––
––
1ms
V
µA
Ω
Ω
V
mA
mA
µA
mA
mA
µA
V
V
V
µs
µs
ns
ns
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3
A3980
Automotive DMOS Microstepping Driver with Translator
Data Sheet
26184.26A
ELECTRICAL CHARACTERISTICS (continued) at T
Characteristics Symbol Test Conditions Min.
= –40°C to +150ºC, V
J
= 14 V, VDD = 3.0 to 5.5 V (unless otherwise noted)
BB
1
Typ.
Max. Units
Current Control
Blank Time t
Fixed Off Time T
Mixed Decay Trip Points
Crossover Dead Time t
Recommended Reference Input Voltage V
) ⁄ I
Prog
2
3
, where I
Prog
= %I
Reference Input Current
Current Trip-Level Error
Thermal Protection
Thermal Shutdown T
Thermal Shutdown Hysteresis T
Diagnostics
Max V
Max VDS on Low-Side Bridge FETs V
VDS Fault Measurement Delay t
Minimum Load Current I
V
V
V
VDD Enable Threshold V
V
1
for individual units, within the specifi ed maximum and minimum limits.
2
3
on High-Side Bridge FETs V
DS
Overvoltage Lockout V
BB
Overvoltage Lockout Hysteresis V
BB
Undervoltage Lockout V
REG
Enable Threshold Hysteresis V
DD
Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions. Performance may vary
Negative current is defi ned as coming out of (sourcing from) the specifi ed device pin.
errI = (I
Trip – IProg
BLANK
PFD
PFD
I
REF
err
DSHT
DSLT
SCT
OVBH
UVDH
TripMAX×
RT = 56 K , CT = 680 pF 700 950 1200 ns
RT = 56 K , CT = 680 pF 30 38 46 µs
OFF
H
––
L
DT
REF
–
–
100 475 800 ns
–
V
= 4 V, %I
REF
V
I
SD
SDH
= 4 V, %I
REF
V
= 4 V, %I
REF
–
––
Sampled after t
Sampled after t
TripMAX
TripMAX
TripMAX
BLANK
BLANK
= 38%
= 70%
= 100%
+ t
SCT
+ t
SCT
160 170 180 ºC
––
w.r.t. I
OC
VBB rising 32 34 36 V
OVB
at Home position
TRIPMAX
–
V
UVR
UVD
falling 5.3 5.7 6.0 V
REG
VDD rising 2.45 2.7 2.95 V
–
I
.
TripMAX
0.60 V
DD
0.21 V
DD
0.8
–3 0 3 µA
–
––
15
–
–
–
2
50 100
1.5
1.5
700
35
–
–
4V
±15
±10
±5
–
–
–
–
–
4V
–
V
%
ºC
V
V
ns
%
mV
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
Automotive DMOS Microstepping Driver with Translator
Logic Interface Timing Diagram
A3980
Data Sheet
26184.26A
STEP
t
SU
MS1, MS2,
or DIR
t
EN
SLEEP
Table 1. Microstep Resolution Truth Table
MS1 MS2 Microstep Resolution
L L Full Step
H L Half Step
L H Eighth Step
H H Sixteenth Step
t
STPH
t
H
t
STPL
Table 2. Fault Report by Fault Flags
FF1 FF2 Fault
LL
H L Short to Ground
L H Short to Supply
H H None
UVLO, OVLO, Overtemperature,
Open Load, or Shorted Load
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5
Automotive DMOS Microstepping Driver with Translator
Table 3. Step Sequencing Settings
Home microstep position at Step Angle 45º; DIR = H
A3980
Data Sheet
26184.26A
Full
Step
#
Half
Step
#
1/8
Step
#
1/16
Step
#
Phase 1
Current
[% I
tripMax
(%)
]
[% I
Phase 2
Current
tripMax
(%)
Step
]
Angle
(º)
Full
Step
#
Half
Step
#
1/8
Step
#
1/16
Step
#
Phase 1
Current
[% I
tripMax
(%)
[% I
]
Phase 2
Current
tripMax
(%)
]
1 1 1 100.00 0.00 0.0 5 17 33 –100.00 0.00 180.0
2 99.52 9.80 5.6 34 –99.52 –9.80 185.6
2 3 98.08 19.51 11.3 18 35 –98.08 –19.51 191.3
4 95.69 29.03 16.9 36 –95.69 –29.03 196.9
3 5 92.39 38.27 22.5 19 37 –92.39 –38.27 202.5
6 88.19 47.14 28.1 38 –88.19 –47.14 208.1
4 7 83.15 55.56 33.8 20 39 –83.15 –55.56 213.8
8 77.30 63.44 39.4 40 –77.30 –63.44 219.4
1 2 5 9 70.71 70.71 45.0 3 6 21 41 –70.71 –70.71 225.0
10 63.44 77.30 50.6 42 –63.44 –77.30 230.6
6 11 55.56 83.15 56.3 22 43 –55.56 –83.15 236.3
12 47.14 88.19 61.9 44 –47.14 –88.19 241.9
7 13 38.27 92.39 67.5 23 45 –38.27 –92.39 247.5
14 29.03 95.69 73.1 46 –29.03 –95.69 253.1
8 15 19.51 98.08 78.8 24 47 –19.51 –98.08 258.8
16 9.80 99.52 84.4 48 –9.80 –99.52 264.4
3 9 17 0.00 100.00 90.0 7 25 49 0.00 –100.00 270.0
18 –9.80 99.52 95.6 50 9.80 –99.52 275.6
10 19 –19.51 98.08 101.3 26 51 19.51 –98.08 281.3
20 –29.03 95.69 106.9 52 29.03 –95.69 286.9
11 21 –38.27 92.39 112.5 27 53 38.27 –92.39 292.5
22 –47.14 88.19 118.1 54 47.14 –88.19 298.1
12 23 –55.56 83.15 123.8 28 55 55.56 –83.15 303.8
24 –63.44 77.30 129.4 56 63.44 –77.30 309.4
2 4 13 25 –70.71 70.71 135.0 4 8 29 57 70.71 –70.71 315.0
26 –77.30 63.44 140.6 58 77.30 –63.44 320.6
14 27 –83.15 55.56 146.3 30 59 83.15 –55.56 326.3
28 –88.19 47.14 151.9 60 88.19 –47.14 331.9
15 29 –92.39 38.27 157.5 31 61 92.39 –38.27 337.5
30 –95.69 29.03 163.1 62 95.69 –29.03 343.1
16 31 –98.08 19.51 168.8 32 63 98.08 –19.51 348.8
32 –99.52 9.80 174.4 64 99.52 –9.80 354.4
Step
Angle
(º)
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
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