24-Channel SPI Serial Bus 63 mA/5.5 V Constant Current LED Driver

PCA9959

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The PCA9959 is a daisy-chain SPI-compatible 4-wire serial bus controlled by a 24-channel constant preset current LED driver optimized for dimming and blinking 63 mA Red/green/blue/amber (RGBA) LEDs.

Each LED output has its own 6-bit resolution (64 steps) preset current configuration, with an absolute accuracy of ±8 %.

PCA9959 supports up to four groups of LED gradation control, with each LED channel assigned to one of the groups. For each group, PCA9959 supports 64-grid brightness control, with the time duration of each grid adjustable from 2.5 μs to 1 ms. Each LED output can be off, on or set at its individual preset current value within each grid. Once gradation control enabled, PCA9959 will automatically change each LED preset current with the setup from grid0 to grid63. Once finished, it can hold grid63 or repeat from grid0 as configured.

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PCA9959 Block Diagram

PCA9959 Block Diagram

PCA9959 Applications Block Diagram

PCA9959 Applications Block Diagram
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Features

General

  • 24 constant preset current output channels can sink up to 63 mA, tolerate up to 5.5 V when OFF
  • Output preset current adjusted through an external resistor (REXT input)
  • Open/short load/overtemperature detection mode to detect individual LED errors
  • 4-wire serial bus interface with 10 MHz data clock rate
  • Active LOW output enable (OE) input pin
  • Internal power-on reset
  • No glitch on LEDn outputs on power-up
  • Low standby preset current
  • Operating power supply voltage (VDD) range of 2.7 V to 5.5 V
  • 5.5 V tolerant inputs on non-LED pins
  • -40 °C to +85 °C operation
  • Latch-up performance exceeds 100 mA per JESD 78, Class II
  • Package offered: HVQFN40

24 LED Drivers

  • Each output programmable at:
    • Off
    • On
    • 6 bits programmable LED brightness
    • Programmable LED output delay to reduce EMI and surge currents when off

Gradation Control for All Channels

  • Each channel can be assigned to one of four gradation control groups
  • 64 grids of gradation control for each channel
  • Programmable grid duration time
  • Four preset current options for each channel during gradation control

Output Preset Current Accuracy

  • ±8 % absolute accuracy with 60 mA output current
  • ±6.5 % absolute accuracy with 30 mA output current
  • Maximum ±5 % channel to channel variation
  • Maximum ±7 % device to device variation

ESD Protection Exceeds per JESD22-A114

  • 2000 V Human-Body Model (A114-A)
  • 1000 V Charged-Device Model (C101)

部品番号： PCA9959HN.

NXP Constant Current LED Controller Family

Number of Channels Part Number Max LED Current Max LED Voltage
16 PCA9952TW/Q900 57 mA 40 V
PCA9955TW/Q900
PCA9955BTW 20 V
PCA9745BTW/Q900
24 PCA9956BTW
PCA9957HN 32 mA 5.5 V
PCA9959HN 63 mA

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