MAX6978AUE+ Maxim Integrated, MAX6978AUE+ Datasheet - Page 6

• Manufacturer Part Number: MAX6978AUE+
• Description: LED Display Drivers 8-Port, 5.5V CC LED Driver w/Fault Det
• Manufacturer: Maxim Integrated

Specifications of MAX6978AUE+

• Rohs: yes
• Number Of Segments: 16
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-16
• Operating Supply Voltage: 3 V to 5.5 V
• Maximum Supply Current: 25 mA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Low Level Output Current: 60 mA
• Power Dissipation: 1702 mW

8-Port, 5.5V Constant-Current LED Driver with
LED Fault Detection and Watchdog
*TSSOP package only.
Figure 1. MAX6978 Block Diagram
6
5–12
PAD
PIN
13
14
15
16
_______________________________________________________________________________________
1
2
3
4
Exposed Pad*
OUT0–OUT7
NAME
DOUT
GND
CLK
SET
DIN
OE
V+
LE
CLK
DIN
OE
LE
Ground
Serial-Data Input. Data is loaded into the internal 8-bit shift register on CLK’s rising edge.
Serial-Clock Input. Data is loaded into the internal 8-bit shift register on CLK’s rising edge.
Load-Enable Input. Data is loaded transparently from the internal shift register to the output latch while
LE is high. Data is latched into the output latch on LE's falling edge, and retained while LE is low.
LED Driver Outputs. OUT0–OUT7 are open-drain, constant-current sinking outputs rated to 5.5V.
Output-Enable Input. High forces outputs OUT0–OUT7 to high impedance, without altering the contents
of the output latches. Low enables outputs OUT0–OUT7 to follow the state of the output latches.
Serial-Data Output. Data is clocked out of the 8-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.
Exposed pad on package underside. Connect to GND.
OUT0
D0
D0
D0
OUT1
SERIAL-TO-PARALLEL SHIFT REGISTER
CONSTANT-CURRENT SINKS
OUT2
FAULT DETECTION
LATCHES
OUT5
OUT6
OUT7
D7
D7
D7
FUNCTION
GND
POWER-ON
REFERENCE
CURRENT
WATCH
MAX6978
RESET
DOG
V+
SET
) to set the maximum LED current.
GND
Pin Description
DOUT
V+
R
SET