Losing control over pwm channels on pca9685 chip

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Losing control over pwm channels on pca9685 chip

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Contributor I

Hi,

I'm working with a pca9685 16-channel, 12-bit PWM I2C-bus LED controller. It's being used to control 12 volt relays (link below). I'm having a weird issue where I lose control of individual channels during testing. A channel will get stuck either high or low and requires a board reset in order to regain control. The board I'm using is from ncd(link below) and should be able to handle the relay load. Any feedback or advice would be greatly appreciated. 

Thank you,

Relay: Ice Cube Control Relay: 15A, SPDT, socket mount (PN# 781-1C-12D) | AutomationDirect 

board: PCA9685 16-Channel 8W 12V FET Driver Proportional Valve Controller with I2C Interface - store.ncd.io 

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NXP TechSupport
NXP TechSupport

Do you mind share your schematic?

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