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2000 Fairchild Semiconductor International
www.fairchildsemi.com
Rev. 1.0.2
May. 2000.
1
Features
Built-in chip enable function (Active low)
Low saturation voltage
Low power dissipation
Input level: TTL, LSTTL, 5V CMOS compatible
Standard MPU direct interface
Built-in Thermal Shutdown(TSD) circuit
2-CH H-bridge driver
Description
The KA2821D is a monolithic integrated circuit, and suit-
able as a two-phase stepping motor driver of a 3.5-inch FDD
system.
20-SOP-300
Typical Application
Floppy disk drive (FDD)
General stepping motor
Ordering Information
Device
Package
Operating Temp.
KA2821D
20-SOP-300
-
20 ~ +75
C
KA2821D
Stepping Motor Driver
KA2821D
2
Pin Assignments
Pin Definitions
Pin Number
Pin Name
I/O
Pin Function Description
Channel
1
NC
-
No connection
-
2
V
CC
-
Logic part supply voltage
A, B
3
DIRA
I
A-channel direction input
A
4
SGND
-
Signal ground
A, B
5
PGND
-
Power ground
A, B
6
PGND
-
Power ground
A, B
7
SGND
-
Signal ground
A, B
8
DIRB
I
B-channel direction input
B
9
CE
I
Chip enable input
A, B
10
NC
-
No connection
-
11
NC
-
No connection
-
12
V
SB
-
B-channel seeking supply voltage
B
13
BOUT
O
B-channel output
B
14
BOUT
O
B-channel inverting output
B
15
P-GND
-
Power ground
A, B
16
P-GND
-
Power ground
A, B
17
AOUT
O
A-channel inverting output
A
18
AOUT
O
A-channel output
A
19
V
SA
-
A-channel seeking supply voltage
A
20
NC
-
No connection
-
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
KA2821D
NC
V
CC
NC
SGND
PGND
PGND
SGND
DIRB
CE
NC
NC
V
SA
AOUT
AOUT
PGND
PGND
BOUT
BOUT
V
SB
NC
KA2821D
3
Internal Block Diagram
TTL
Interface
TSD
TTL
Interface
V
CC
DIRA
DIRB
CE
V
SA
AOUT
AOUT
V
SB
BOUT
BOUT
PGND
PGND
2
3
8
9
15
13
14
12
16
17
18
19
KA2821D
4
Absolute Maximum Ratings (Ta = 25
C)
Power Dissipation Curve
Recommended Operating Conditions
(Ta = 25
C)
Parameter
Symbol
Value
Unit
Logic part supply voltage
V
CC
7.0
V
Seeking supply voltage
V
SA, B
15.0
V
Input voltage
V
IN
0 ~ V
CC
V
Seeking output current (Continuouts)
I
OS
330
mA
Seeking output current (Peak)
I
OSPEAK
500
mA
Package power dissipation
P
D
1.0
W
Operating temperature range
T
OPR
-
20 ~ 75
C
Storage temperature
T
STG
-
40 ~ 125
C
Parameter
Symbol
Min.
Typ.
Max
Unit
Logic part supply voltage
V
CC
4.5
5.0
5.5
V
Seeking supply voltage
V
SA, B
4.5
-
13.8
V
0
0
25
50
75
100
125
Ambient temperature, Ta [
C]
150
175
0.5
1.0
1.33
Power
Dissipation
: PD[W] 1.0
KA2821D
5
Electrical Characteristics
(Ta=25
C, V
CC
=5V, V
SA
=12V, V
SB
=12V, unless specified otherwise)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Digital input "L" voltage
V
IL
-
-
-
0.8
V
Digital high level input voltage
V
IH
-
2.0
-
-
V
Digital low input current
I
IL
V
IN
=0.8V
-
0
10
A
Digital high input current
I
IH1
V
IN
=2.0V
-
1
10
A
I
IH2
V
IN
=5V
-
0.3
1.0
mA
IV
CCL
CE=0.8V
-
25
3
mA
Supply current
IV
SL
CE=0.8V
-
6
10
mA
IV
CCH
CE=0.8V
-
25
33
mA
IV
SH
CE=2.0V
-
1
2
mA
Output sustain voltage
V
SUS
I
O
=10mA, CE=0.8V
18
-
-
V
V
SA, B
output saturation voltage
V
SAT1
I
O
=300mA, CE=2.0V
-
1.5
2.0
V
Output clamp voltage
V
FU
I
O
=130mA (Upper)
-
3.0
5.0
V
V
FL
I
O
=330mA (Lower)
-
1.5
2.0
V
Output delay time
T
PLH
Input pulse (2kHz)
-
1.0
5.0
s
T
PHL
Input pulse (2kHz)
-
1.0
5.0
s
TSD operating temperature
TSD
-
125
150
-
C
TSD hysterisis
TSD
-
-
25
-
C
KA2821D
6
Application Information
1. MOTOR CONTROL LOGIC
Mode selection-truth table
Notes:
DIRY: DIRA or DIRB (Direction input)
YOUT: AOUT or BOUT (Non-inverting output)
YOUT: AOUT or BOUT (Inverting output)
Y: Indicate each channel (A and B)
X: High impedance
2. MAXIMUM CURRENT DRIVE CAPACITY
Peak seeking output current: 0.5A
Continuous seeking output current: 0.33A
Holding output current: 0.2A
Input
Output
Operating Mode
CE
DIRY
YOUT
YOUT
L
L
L
H
Seeking Mode
L
H
H
L
H
L
X
X
Open Mode
H
H
X
X
KA2821D
7
Timing Chart
Typical Application Circuits
CE
DIRA, B
A, BOUT
A, BOUT
50%
T
PHL
T
PLH
T
PHL
T
PLH
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
V
CC
DIRA
SGND
PGND
PGND
SGND
DIRB
CE
NC
NC
V
SA
AOUT
AOUT
PGND
PGND
BOUT
BOUT
V
SB
NC
KA2821D
Load A
V
CC
(5V)
A-CH in
B-CH in
Chip enable in
Load B
KA2821D
12/1/00 0.0m 001
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2000 Fairchild Semiconductor International
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instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
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device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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