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Automatic Headlamp On and Day Running Light

Implement Automatic Headlamp On (AHO) and Day Running Light (DRL) Solution with increased Fuel Efficiency and improved Safety

Overview

Renesas offers reference solution for AHO/DRL with Renesas Low Power RL78/F12 Series Mcrocontroller and Intelligent Power Devices (IPD) to drive Headlamp, Tail Lamp and Tell Tale Indicators.

 

Automatic Headlamp On (AHO) / Day Running Light (DRL) is developed to keep headlamp ON during the ignition ON of vehicle. This reference design complies with upcoming safety standard for two wheelers (IS code to be defined). The specifications defined for the reference design are based on the inputs from Indian 2 Wheeler OEM.

 

The low power automotive microcontroller RL78/F12 series and IPDs are used for the functional requirement. The reference design unique approach also targets to maintain the overall fuel efficiency even while Electrical Load is increased due to Always ON function of the Head Lamp. In addition, the design also considers load on the Battery during Engine Idling state.

 

 

Features

Items Specifications
Microcontroller R5F10968 (RL78/F12 16 Bit MCU, 8KB Program Flash)
Headlamp Driver UPD166031T1U, Under Voltage Protection, Over Voltage Protection, Short Circuit Protection, 12Volt compatible
Tail Lamp and Tell Tale Driver UPD166029T1J, Under Voltage Protection, Over Voltage Protection, Short Circuit Protection, 12 Volt compatible
RPM 0-200Hz/5V compatible signal
Battery 12 Volt System
Protection Features

Maximum Operating Voltage is 35V.

RPM interlocked Load ON operation supported.

 

 

System Block Diagram

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