Part: PCA9685 — NXP Semiconductors

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

Description: A 16-channel LED controller with 12-bit (4096 steps) individual PWM resolution per output, programmable PWM frequency from 24 Hz to 1526 Hz, and an I2C-bus interface supporting Fast-mode Plus (Fm+) up to 1 MHz.

Operating Conditions:

• Supply voltage: 2.3 V to 5.5 V
• Operating temperature: -40 °C to +85 °C
• PWM frequency: 24 Hz to 1526 Hz
• I2C-bus frequency: up to 1 MHz

Absolute Maximum Ratings:

• Max junction/storage temperature: +85 °C (operating temperature)

Key Specs:

• Number of LED channels: 16
• PWM resolution: 12-bit (4096 steps)
• LED output current sink capability: 25 mA (at 5 V)
• LED output current source capability: 10 mA (at 5 V, totem pole mode)
• Internal oscillator frequency: 25 MHz (typical)
• External clock input: 50 MHz (max.)
• Input/output tolerance: 5.5 V
• I2C-bus SDA output drive capability: 30 mA

Features:

• Individual 12-bit (4096 steps) brightness control for each LED output
• Programmable PWM frequency from 24 Hz to 1526 Hz
• Staggered LED output on and off times to minimize current surges
• Programmable prescaler to adjust PWM pulse widths for multiple devices
• External clock input (50 MHz max.) for synchronization
• Software programmable open-drain or totem pole LED outputs
• Active LOW Output Enable (OE) input for asynchronous control
• 6 hardware address pins allowing up to 62 devices on the same I2C-bus
• 4 software programmable I2C-bus addresses (one LED All Call, three LED Sub Call)
• Software Reset feature (SWRST General Call)
• Internal power-on reset
• Noise filter on SDA/SCL inputs
• Supports hot insertion
• Low standby current
• ESD protection exceeds 2000 V HBM, 200 V MM, 1000 V CDM

Applications:

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

Package:

• TSSOP28 (28 leads, body width 4.4 mm)
• HVQFN28 (28 terminals, 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 I 2 C-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 2 C-bus
• Toggling OE allows for hardware LED blinking
• 4 software programmable I 2 C-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 I 2 C-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 I 2 C-bus address.
• Software Reset feature (SWRST General Call) allows the device to be reset through the I 2 C-bus

• 25 MHz typical internal oscillator requires no external components
• External 50 MHz (max.) clock input
• 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
• Operating power supply voltage range of 2.3 V to 5.5 V
• 5.5 V tolerant inputs
• 40 C to +85 C operation
• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
• Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
• Packages offered: TSSOP28, HVQFN28

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

PCA9685PW – TSSOP28 Package Pinout

Notes

• PCA9685PW is a 28-pin TSSOP package variant (HVQFN28 variant also exists with different pin numbering).
• 16 LED driver outputs (LED0–LED15) with PWM control capability.
• I²C interface via SCL/SDA pins.
• 6-bit address input (A0–A5) allows up to 64 devices on the same I²C bus.
• OE pin is active LOW; pull LOW to enable outputs.
• EXTCLK pin allows external clock input for timing control.

SOT788-1

Fig 37. Package outline SOT788-1 (HVQFN28)

Fig 36. Package outline SOT361-1 (TSSOP28)

Fig 36. Package outline SOT361-1 (TSSOP28)