Rainbow Electronics MAX6983 - Manual (Page 6)

MAX6983
16-Port, 36V Constant-Current LED Driver with
LED Fault Detection and Watchdog
6 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1 GND Ground
2 DIN Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.
3 CLK Serial-Clock Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.
4 LE
Load-Enable Input. Data is loaded transparently from the internal shift register(s) to the output latch(es)
while LE is high. Data is latched into the output latch(es) on LE's falling edge, and retained while LE is
low.
5–20 OUT0–OUT15 LED Driver Outputs. OUT0 to OUT15 are open-drain, constant-current sinking outputs rated to 28V.
21 OE
Output Enable Input. High forces outputs OUT0 to OUT15 high impedance, without altering the contents
of the output latches. Low enables outputs OUT0 to OUT15 to follow the state of the output latches.
22 DOUT Serial-Data Output. Data is clocked out of the 16-bit internal shift-register to DOUT on CLK’s rising edge.
23 SET LED Current Setting. Connect SET to GND through a resistor (RSET) to set the maximum LED current.
24 V+ Positive Supply Voltage. Bypass V+ to GND with a 0.1µF ceramic capacitor.
SERIAL-TO-PARALLEL SHIFT REGISTER
LATCHES
OUT0
OUT1
OUT2
DOUT DIN
CLK
OUT15
CONSTANT-CURRENT SINKS
OUT13
OUT14
POWER-ON
RESET
V+
CURRENT
REFERENCE
V+
OE
GND
GND
LE
D0 D15
D0 D15
D0 D15
R SET
MAX6983
FAULT DETECTION
WATCH-
DOG
Figure 1. Block Diagram