MAX6970 Maxim Integrated Products, MAX6970 Datasheet - Page 6

• Manufacturer Part Number: MAX6970
• Description: 36V Constant-Current LED Driver
• Manufacturer: Maxim Integrated Products

16-Port, 36V Constant-Current LED Driver
Figure 1. Block Diagram
6
5–20
PIN
21
22
23
24
_______________________________________________________________________________________
1
2
3
4
OUT0–OUT15
NAME
DOUT
GND
CLK
SET
DIN
OE
V+
LE
CLK
DIN
OE
LE
Ground
Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.
Serial-Clock Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.
Load - E nab l e Inp ut. D ata i s l oad ed tr ansp ar entl y fr om the i nter nal shi ft r eg i ster ( s) to the outp ut l atch( es)
w hi l e LE i s hi g h. D ata i s l atched i nto the outp ut l atch( es) on LE ’ s fal l i ng ed g e, and r etai ned w hi l e LE i s l ow .
LED Driver Outputs. OUT0 to OUT15 are open-drain, constant-current-sinking outputs rated to 28V.
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.
Serial-Data Output. Data is clocked out of the 16-bit internal shift register to DOUT on CLK’s rising edge.
LED Current Setting. Connect SET to GND through a resistor (R
Positive Supply Voltage. Bypass V+ to GND with a 0.1µF ceramic capacitor.
OUT0
D0
D0
D0
OUT1
SERIAL-TO-PARALLEL SHIFT REGISTER
CONSTANT-CURRENT SINKS
OUT2
LATCHES
OUT3
OUT4
OUT15
D15
D15
D15
FUNCTION
GND
POWER-ON
REFERENCE
CURRENT
RESET
MAX6971
V+
SET
) to set the maximum LED current.
Pin Description
GND
DOUT
V+
R
SET