4255
A4255CA
8-BIT
MICROCONTROLLER
The A4255CA and A4255CLN microcontrollers make designing
with step motors easy, inexpensive, and productive. A reference design
technique is integral to the implementation of a system that includes the
power circuitry, a low-cost, 8-bit, preprogrammed microcontroller and
the other components needed to complete the control hardware. The
A4255Cx eliminates the need for software development, expedites the
product creation, and hastens the time to market.
The reference design can be utilized directly or integrated into a
larger printed wiring board. A further benefit is the compactness of the
circuit layout. Power-driver output ratings presently available with these
devices are 50 V and
鹵1.5
A (with the A3955 or A3957). A similar
device for 46 V and either 1.5 A (with the SLA7042M) or 3 A (with the
SLA7044M) is planned. The reference design supports stepping formats
that include full-step, half-step, quarter-step, eighth-step, and sixteenth-
step (microstepping) increments for a two-phase stepping motor.
The A4255CA is furnished in an 18-pin dual in-line plastic package
for through-hole applications. The A4255CLN is furnished in a 20-lead
wide-body, shrink-pitch, small-outline plastic package (SSOP) with gull-
wing leads for minimum area, surface-mount applications.
Data Sheet
26113
MODE SELECT
1
MODE SELECT
2
STEP IN
RESET
GROUND
MONITOR OUT
SHIFT CLOCK
SERIAL DATA OUT
STROBE OUT
1
2
3
4
5
6
7
8
9
V
DD
18
17
16
15
14
13
12
11
10
MODE SELECT
0
DIRECTION
CONTROL IN
OSC/CLOCK IN
OSC/CLOCK OUT
SUPPLY
PFD
A
PHASE
A
PFD
B
PHASE
B
Dwg. PP-071A
FEATURES
ABSOLUTE MAXIMUM RATINGS
I
I
I
I
I
I
Full-, Half-, Quarter-, Eighth-, or Sixteenth-Step Increments
DC to 20 MHz Clock Input
Power-On Reset
Brown-Out Reset
High-Speed CMOS Technology
Low Power, <20 mA @ 5 V, 20 MHz
(Typically 9 mA)
Supply Voltage, V
DD
..........................
7.0 V
Input Voltage Range,
V
I
........................
-0.3 V to V
DD
+ 0.6 V
RESET Voltage, V
RESET
......................
14 V
Input Clamp Current, I
IK
...............
鹵
20 mA
Output Clamp Current, I
OK
............
鹵
20 mA
Operating Temperature Range,
T
A
....................................
0
擄
C to +70
擄
C
Storage Temperature Range,
T
S
..............................
-55
擄
C to +150
擄
C
Caution: These CMOS devices have input
static protection (Class 3) but are still
susceptible to damage if exposed to extremely
high static electrical charges.
Always order by complete part number:
Part Number
Package
A4255CA
18-pin DIP
A4255CLN
20-lead shrink-pitch SOIC
1
2
3
4
5
6
7
8
