4255 Datasheet, PDF (1/8 Pages) Allegro MicroSystems – 8-BIT MICROCONTROLLER

4255
A4255CA
MODE SELECT1 1
MODE SELECT2 2
STEP IN 3
RESET 4
GROUND 5
MONITOR OUT 6
SHIFT CLOCK 7
SERIAL DATA OUT 8
STROBE OUT 9
18 MODE SELECT0
DIRECTION
17 _{CONTROL IN}
16 OSC/CLOCK IN
15 OSC/CLOCK OUT
VDD 14 SUPPLY
13 PFDA
12 PHASEA
11 PFDB
10 PHASEB
Dwg. PP-071A
ABSOLUTE MAXIMUM RATINGS
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 ............... ±20 mA
Output Clamp Current, I_OK ............ ±20 mA
Operating Temperature Range,
T_A .................................... 0°C to +70°C
Storage Temperature Range,
T_S .............................. -55°C to +150°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.
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 ±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.
FEATURES
I Full-, Half-, Quarter-, Eighth-, or Sixteenth-Step Increments
I DC to 20 MHz Clock Input
I Power-On Reset
I Brown-Out Reset
I High-Speed CMOS Technology
I Low Power, <20 mA @ 5 V, 20 MHz
(Typically 9 mA)
Always order by complete part number:
Part Number
A4255CA
A4255CLN
Package
18-pin DIP
20-lead shrink-pitch SOIC