PCA9958 24-Channel SPI Serial Bus LED Driver

Product Highlights > PCA9958 24-Channel SPI Serial Bus LED Driver

            PCA9958 24-Channel SPI Serial Bus LED Driver
                    NXP LED drivers offer a supply voltage range of 2.7 V to 5.5 V
    

Image of NXP PCA9958 24-Channel SPI Serial Bus NXP PCA9958 is a 24-channel SPI serial bus 63 mA LED driver with a supply voltage range of 2.7 V to 5.5 V. This device is optimized for dimming and blinking RGBA LEDs.

Each LED has its own 8-bit resolution fixed frequency, operating at 31.25 kHz with an adjustable duty cycle from 0% to 100% for brightness control. The additional PWM controller has a fixed frequency of 122 Hz and an adjustable frequency of 15 Hz duty cycle from 0% to 99.6% for dimming and blinking control.

Output peak current is adjustable with an 8-bit linear DAC from 250 µA to 63.75 mA. The PCA9958 has open and short detection circuitry and thermal shutdown protection. This device has a four-wire SPI bandwidth of 10 MHz to communicate with the local micro.

The PCA9958HN-ARD Arduino Shield allows easy integration with Arduino EVKs to evaluate the LED driver features for color mixing, blinking, and dimming LEDs. A graphical interface allows the user to easily explore the different functions of the driver to create an evaluation system.

Features

24 programmable LED drivers
- Off/on control
- 8-bit programmable
  - LED brightness
  - Group and individual dimming/blinking
- Output delay to reduce EMI and surge currents
- 24 constant current output channels can sink up to 63 mA and tolerate up to 5.5 V when OFF
High LED driver programmability
- Each channel can be assigned to one of six 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
HVQFN40 package
- Available in an HVQFN40 wettable flanks package for AEC-Q100 automotive applications
- 0.5 mm pitch, 6 mm x 6 mm x 0.85 mm body rated for -40°C to +125°C operation

Output accuracy
- ± 7.5% absolute accuracy with 60 mA
- ± 9% absolute accuracy with 30 mA output current
- ± 5% max channel-to-channel variation
- ± 7% max device-to-device variation
Robustness
- Latch-up performance exceeds 100 mA per JESD 78, Class II
- ESD protection exceeds per JESD22
  - 2 kV HBM
  - 750 V CDM
- 5.5 V tolerant inputs on non-LED pins
- Internal power-on reset

Applications

Automotive
- Armrest lighting
- Cabin roof lighting
- Door lighting
- Steering wheel lighting
- Infotainment

Industrial
- RGB or RGBA LED drivers
- LED status information
- LED displays
- LCD backlights
- Keypad backlights for cellular phones or handheld devices
- Fade-in and fade-out for breath light control

PCA9958 Block Diagram