ucn5829 Allegro MicroSystems, Inc., ucn5829 Datasheet - Page 7

• Manufacturer Part Number: ucn5829
• Description: 9-bit Serial-input, Latched Sink Driver
• Manufacturer: Allegro MicroSystems, Inc.

(3 devices cascaded) dot matrix impact printer solenoids. The internal
CMOS control logic:
previously loaded into the shift register,
constant-frequency switch-mode current choppers,
interval.
register on the low-to-high transition of the CLOCK input pulse. The
data must appear at the input prior to the rising edge of the clock input
waveform. On succeeding clock pulses, the registers shift data infor-
mation towards the SERIAL DATA OUTPUT. Information present at
any register is transferred to its respective latch on the high-to-low
transition of the STROBE (serial-to-parallel conversion). Drivers that
have a logic high stored in their latch will be enabled for a set time
interval (t
internally sensed and controlled in a fixed-frequency chopper format.
Between strobe pulses, a new data word can be clocked in for the next
print enable cycle.
one-shot which sets the print enable time (t
the external high-side driver. The print enable time is determined by an
external resistor (50 k
sor. In this mode, the internal one-shot is operated as an output
disable function. In this mode, R
10 k
generated output disable pulse. As before, on the high-to-low
STROBE transition, the outputs will be enabled. They will remain
enabled until a low-to-high logic ( 3.3 V) DISABLE transition at RC
enable timeout nor output disable are desired, RC
grounded.
The UCN5829EB is designed to drive high-current, 9- or 24-wire
1) selects the operating channels from a 9- or 24-bit word
2) controls the peak load current of the output drivers via nine
3) sets a user-defined print enable time, and
4) turns ON an external high-side driver during the print enable
Data present at the SERIAL DATA INPUT is transferred to the shift
The print enable time can also be controlled from a microproces-
When operating in a continuous chopping mode, and neither print
series resistor is connected between RC
A high-to-low transition of the STROBE input starts an internal
EN
) generated by an internal one-shot. The output current is
LATCHED SINK DRIVER
max) and capacitor (100 pF min) at RC
9-BIT SERIAL-INPUT,
t
EN
EN
= R
and C
EN
C
EN
EN
EN
are not used; instead a
) of the output drivers and
EN
and an externally
EN
should be
5829
EN
as
EN
.