16-Channel SPI Serial Bus 57 MA/20 V Constant Current LED Driver




System Features

  • 16 LED drivers. Each output programmable at:
    • Off, On
    • Programmable LED brightness
    • Programmable group dimming/blinking mixed with individual LED brightness
    • Programmable LED output delay to reduce EMI and surge currents
  • Gradation control for all channels
    • Each channel can assign to one of four gradation control groups
    • Programmable gradation time and rate for ramp-up and/or ramp-down operations
    • Programmable step time (6-bit) from 0.5 ms (minimum) to 512 ms(maximum)
    • Programmable hold-on time after ramp-up and hold-off time after ramp-down(3-bit) from 0 s to 6 s
    • Programmable final ramp-up and hold-on current
    • Programmable brightness current output adjustment, either linear or exponential curve
  • 16 constant current output channels can sink up to 57 mA, tolerate up to 20 V when OFF
  • Output current adjusted through an external resistor (REXT input)
  • Output current accuracy
    • ±4 % between output channels
    • ±6 % between PCA9745B devices
  • Open/short load/over-temperature detection mode to detect individual LED errors
  • 4-wire serial bus interface with 25 MHz data clock rate
  • 256-step (8-bit) linear programmable brightness per LED output varying from fully off (default) to maximum brightness fully ON using a 31.25 kHz PWM signal
  • 256-step group brightness control allows general dimming (using a 122 Hz PWM signal) from fully off to maximum brightness (default)
  • 256-step group blinking with frequency programmable from 15 Hz to 16.8s and duty cycle from 0 % to 99.6 %
  • Active LOW Output Enable (OE) input pin allows for hardware blinking and dimming of the LEDs
  • 8 MHz internal oscillator requires no external components
  • Internal power-on reset
  • Noise filter on SDI/SCLK inputs
  • No glitch on LED outputs on power-up
  • Low standby current
  • Operating power supply voltage (VDD) range of 3 V to 5.5 V
  • 5.5 V tolerant inputs on non-LED pins
  • ˗40 ºC to +105 ºC operation
  • ESD protection exceeds 4 kV HBM per JESD22-A114
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
  • Packages offered: HTSSOP28

部品番号: PCA9745BTW.


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