The NCV7685 consists of twelve linear programmable constant current sources with common reference. The part is designed for use in the regulation and control of LED for automotive applications. The NCV7685 allows 128 different duty cycle levels adjustable using pulse width modulation (PWM) independently for each output channel programmable via I2C serial interface. PWM frequency can be chosen in four different configurations up to 1200 Hz. The device can be used with micro−controller applications using the I2C bus or in stand−alone applications where a choice could be done in between 2 different static configuration settings. The IC also provides 3.3 V voltage reference to the application for loads up to 1 mA. LED brightness level is easily programmed using an external resistor. Each channel has an internal circuitry to detect open−load conditions with an optional auto−recovery mode. If one driver is in open−load condition, all other channels could be turned off according to the programmable bit setting. The device is available in small body size SSOP24−EP package.
Features
12 Common Current Programmable Sources up to 60 mA
Independent PWM Duty Cycle Control for each Channel via PC
Common PWM Duty Cycle Control via I2C
On−Chip 150, 300, 600 and 1200 Hz PWM
Open LED String Diagnostics
Low Dropout Operation for Pre−Regulator Applications
Single Resistor for Current Set Point
Voltage Reference 3.3 V/1 mA
8 Bits I2C Interface with CRC8 Error Detection
OTP Bank for Stand−Alone Operation (2 Configurations)
Output Enable Pin
Detection and Protection Against Open Load and Under−Voltage
Over Temperature Detection and Protection
Low Emission with Spread Spectrum Oscillator
NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
SSOP24−EP Packaging
Applications
End Products
Entry Level LED Tail Lights. NCV7685 used without MCU
Option Level LED Tail Lights with Sequential Turn Indicator. NCV7685 controlled by Low End MCU
High End Pixelized LED Tail Light with Full Animation Capabilities
Turn Signal and Other Externally Modulated Applications
