A6278 ALLEGRO [Allegro MicroSystems], A6278 Datasheet - Page 3

• Manufacturer Part Number: A6278
• Description: Serial-Input Constant-Current Latched LED Drivers with Open LED Detection
• Manufacturer: ALLEGRO [Allegro MicroSystems]

A6278
A6279
SERIAL DATA IN
LATCH ENABLE
Terminal List Table
5 TO 12
A6278
13
14
15
16
and
1
2
3
4
–
–
CLOCK
A, LW, LP
Number
OUT0
OUT1
OUT2
OUT3
GND
Package A, LW, LP
5 TO 20
1
2
3
4
5
6
7
8
A6279
21
22
23
24
1
2
3
4
–
–
16-pin
EP
SERIAL DATA OUT
OUTPUT ENABLE
SERIAL DATA IN
LATCH ENABLE
LOGIC SUPPLY
CLOCK
Name
16
15
14
13
12
11
10
REXT
OUTx
9
GND
NC
EP
LOGIC SUPPLY
REXT
SERIAL DATA OUT
OUTPUT ENABLE
OUT7
OUT6
OUT5
OUT4
Pin-out Diagrams
Serial-Input, Constant-Current Latched
LED Drivers with Open LED Detection
Reference terminal for logic ground and power ground
Serial-data input to the shift-register
Clock input terminal; data is shifted on the rising edge of the clock.
Data strobe input terminal; serial data is latched with a high-level input
Current-sinking output terminals
(Active low) Set low to enable output drivers; set high to turn OFF
(blank) all output drivers
CMOS serial-data output; for cascading to the next device (to that
device SERIAL DATA IN pin); for reading OCD bits.
An external resistor at this terminal establishes the output current for all
of the sink drivers.
(V
No connection
LP and ET packages only; exposed thermal pad for heat dissipation
DD
) Logic supply voltage (typically 3.3 or 5.0 V)
SERIAL DATA IN
LATCH ENABLE
CLOCK
Function
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
GND
Package A, LW, LP
10
11
12
1
2
3
4
5
6
7
8
9
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
24-pin
EP
24
23
22
21
20
19
18
17
16
15
14
13
LOGIC SUPPLY
REXT
SERIAL DATA OUT
OUTPUT ENABLE
OUT15
OUT14
OUT13
OUT12
OUT11
OUT10
OUT9
OUT8
3