PCA9685 Datasheet

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PCA9685 16-channel, 12-bit PWM Fm+ I2C-bus LED controller


Features and benefits
„ 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 40 Hz to 1000 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
I2C-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

„ 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





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bidezhi7777

       好资料，谢谢分享！！！

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