CAT310 Datasheet, PDF (7/10 Pages) Catalyst Semiconductor – 10 Channel Automotive LED Display Driver

FUNCTIONAL DESCRIPTION
The CAT310 implements a 10-bit serial-in shift
register for storing the setting of the ten outputs.
Serial input data SIN are clocked into the shift
register on the rising edge of the clock. At the
10^th clock pulse, the first data bit entered is
outputted from the shift register to SOUT. The
following clock pulses will output the following
data bits onto SOUT. The output data pattern
replicates the input data stream with a delay of
ten clock pulses.
The 10-bit data pattern present in the shift
register is stored in the 10-bit data latch when
CAT310
the latch signal XLAT is logic high. When XLAT
transitions to logic low, data are latched and
stay unchanged for as long as XLAT remains
low. The last serial input data corresponds to
OUT0. The serial input data that was received
10 clock pulse ago is stored in OUT9. When the
BLANK input is logic high, all the output
switches are in the off state. If the BLANK input
is low, the 10-bit data latches control the 10
output switches. A data bit value of zero keeps
the switch off. A data bit value of one keeps the
switch on.
Serial to Parallel Shift Register
CLK → Bit Bit Bit
SIN →
0
1
2
Data Latch ↓
↓
↓
XLAT →
LED LED LED
OUT0 OUT1 OUT2
Bit
3
↓
LED
OUT3
Bit
4
↓
LED
OUT4
Bit
5
↓
LED
OUT5
Bit
6
↓
LED
OUT6
Bit
7
↓
LED
OUT7
Bit
8
↓
LED
OUT8
Bit
9
↓
LED
OUT9
→ SOUT
TIMING DIAGRAM
© 2005 Catalyst Semiconductor, Inc.
7
Characteristics subject to change without notice
Doc No. 25087, Rev. 00