PCA9685

Part: PCA9685, NXP

Type: 16-channel, 12-bit PWM Fm+ I2C-bus LED controller

Key Specs:

• Channels: 16
• PWM Resolution: 12-bit (4096 steps)
• PWM Frequency: 24 Hz to 1526 Hz
• Supply Voltage: 2.3 V to 5.5 V
• LED Output Sink Current: 25 mA at 5 V
• LED Output Source Current (Totem Pole): 10 mA at 5 V
• I2C-bus Frequency: up to 1 MHz (Fm+)
• Operating Temperature: -40 C to +85 C

Features:

• Individual 12-bit PWM controller per channel
• Programmable PWM frequency
• Adjustable duty cycle from 0 % to 100 %
• Open-drain or totem pole output driver selection
• 5.5 V tolerant inputs and outputs
• Staggered LED output on and off times to minimize current surges
• Programmable prescaler to adjust PWM pulse widths of multiple devices
• External clock input (50 MHz max.)
• Internal 25 MHz oscillator
• Active LOW Output Enable (OE) input pin
• Software programmable LED All Call and three Sub Call I2C-bus addresses
• 6 hardware address pins allow up to 62 devices on the same bus
• Software Reset (SWRST) General Call
• 1 MHz Fast-mode Plus compatible I2C-bus interface
• 30 mA high drive capability on SDA output
• Output state change programmable on Acknowledge or STOP Command
• Toggling OE allows for hardware LED blinking
• Internal power-on reset
• Noise filter on SDA/SCL inputs
• Edge rate control on outputs
• No output glitches on power-up
• Supports hot insertion
• Low standby current
• ESD protection exceeds 2000 V HBM, 200 V MM, 1000 V CDM
• Latch-up testing to JEDEC Standard JESD78 (>100 mA)

Applications:

• RGB or RGBA LED drivers
• LED status information
• LED displays
• LCD backlights
• Keypad backlights for cellular phones or handheld devices

Package:

• TSSOP28: body width 4.4 mm
• HVQFN28: body 6 × 6 × 0.85 mm

• 16 LED drivers. Each output programmable at:
  • Off
  • On
  • Programmable LED brightness
  • Programmable LED turn-on time to help reduce EMI
• 1 MHz Fast-mode Plus compatible I2C-bus interface with 30 mA high drive capability on SDA output for driving high capacitive buses
• 4096-step (12-bit) linear programmable brightness per LED output varying from fully off (default) to maximum brightness
• LED output frequency (all LEDs) typically varies from 24 Hz to 1526 Hz (Default of 1Eh in PRE_SCALE register results in a 200 Hz refresh rate with oscillator clock of 25 MHz.)
• Sixteen totem pole outputs (sink 25 mA and source 10 mA at 5 V) with software programmable open-drain LED outputs selection (default at totem pole). No input function.
• Output state change programmable on the Acknowledge or the STOP Command to update outputs byte-by-byte or all at the same time (default to 'Change on STOP').
• Active LOW Output Enable (OE) input pin. LEDn outputs programmable to logic 1, logic 0 (default at power-up) or 'high-impedance' when OE is HIGH.
• 6 hardware address pins allow 62 PCA9685 devices to be connected to the same I 2C-bus
• Toggling OE allows for hardware LED blinking
• 4 software programmable I2C-bus addresses (one LED All Call address and three LED Sub Call addresses) allow groups of devices to be addressed at the same time in any combination (for example, one register used for 'All Call' so that all the PCA9685s on the I2C-bus can be addressed at the same time and the second register used for three different addresses so that 1⁄ 3 of all devices on the bus can be addressed at the same time in a group). Software enable and disable for these I2C-bus address.
• Software Reset feature (SWRST General Call) allows the device to be reset through the I2C-bus

• RGB or RGBA LED drivers
• LED status information
• LED displays
• LCD backlights
• Keypad backlights for cellular phones or handheld devices

Fig 37. Package outline SOT788-1 (HVQFN28)

PCA9685 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.