High Efficiency Arm® Cortex®-M33-Based Microcontroller Family
Design Files
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PCA9958 24-Bit 63 mA Current LED Driver with SPI
The 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 0% - 100% for brightness control. Additional PWM controller has a fixed frequency of 122 Hz and adjustable frequency of 15 Hz duty cycle from 0% - 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 4-wire SPI bandwidth of 10 MHz to communicate with the local micro.
Product Details
Features
24 Programmable LED Drivers
- Off/On control
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8-bits programmable
- LED Brightness
- Group and individual dimming/blinking
- Output delay to reduce EMI and surge currents
Gradation Control
- Each can be assigned to 1 of 6 control groups
- Ramp up/down (slew rate)
- Step time (time per step from 256 steps)
- Hold on current (time at peak)
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 Features
- Latch-up performance exceeds 100 mA per JESD 78, Class II
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ESD protection exceeds per JESD22
- 2 kV HBM
- 750 V CDM
- 5.5 V tolerant inputs on non-LED pins
- Internal power-on reset
HVQFN40 package
- 0.5 mm pitch, 6 mm x 6 mm x 0.85 mm body rated up to +125 ⁰C
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1 hardware offering
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Development Hardware24-Channel SPI Serial Bus 63 mA / 5.5 V Constant-Current LED Driver