16-Port, 5.5V Constant-Current LED Driver
DescriptionThe MAX6969 serial-interfaced LED driver provides 16 open-drain, constant-current-sinking LED driver outputs rated at 5.5V. The MAX6969 operates from a 3V to 5.5V supply. The MAX6969 supply and the LEDs' supply or supplies can power up in any order. The constant-current outputs are programmed together to up to 55mA using a single external resistor. The MAX6969 operates with a 25Mb, industry-standard, 4-wire serial interface.
The MAX6969 uses the industry-standard, shift-register-plus-latch-type serial interface. The driver accepts data shifted into a 16-bit shift register using data input DIN and clock input CLK. Input data appears at the DOUT output 16 clock cycles later to allow cascading of multiple MAX6969s. The latch-enable input, LE, loads the 16 bits of shift register data into a 16-bit output latch to set which LEDs are on and which are off. The output-enable, active-low OE, gates all 16 outputs on and off, and is fast enough to be used as a PWM input for LED intensity control.
For applications requiring LED fault detection, refer to the MAX6984*, which automatically detects open-circuit LEDs.
For safety-related applications requiring a watchdog timer, refer to the MAX6979, which includes a fail-safe feature that blanks the display if the serial interface becomes inactive for more than 1s.
The MAX6969 is one of a family of 12 shift-register-plus-latch-type LED drivers. The family includes 8-port and 16-port types, with 5.5V- or 36V-rated LED outputs, with and without open-circuit LED detection and watchdog. All versions operate from a 3V to 5.5V supply, and are specified over the -40°C to +125°C temperature range.
- 25Mb, Industry-Standard, 4-Wire Serial Interface at 5V
- 3V to 5.5V Logic Supply
- 16 Constant-Current LED Outputs Rated at 5.5V
- Up to 55mA Continuous Current per Output
- Output Current Programmed by Single Resistor
- 3% Current Matching Between Outputs
- 6% Current Matching Between ICs
- High-Dissipation, 24-Pin Packages
- -40°C to +125°C Temperature Range
- Architectural Lighting
- Gaming Features
- Marquee Displays
- Point-of-Order Signs
- Traffic Signs
- Variable Message Signs
|Part Number||LCD or LED||Digits or Char.||Output Format||Display Type||Interface||Segment Blinking||VSUPPLY|
|MAX6969||LED||16-Segment||Any digit type||Common Anode||Serial 4-Wire 25Mbit||No||3||5.5|
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|
- High Integration
- Low EMI
- I2C Control/Diagnostic Interface with FLTB (Interrupt) Output