Strata Enabled STR-DMS-NCV7694-GEVK Driver Monitoring System User Guide © Semiconductor Component Industries, LLC, 2021 1 July, 2021 – Rev .
Contents 1. INTRODUCTION .............................................................................................................................................................................. 3 Features.............................................................................................................................................................................................. 3 2. USER GUIDE ...............................................................................................
1. Introduction STR-DMS-NCV7694-GEVK provides an easy to use evaluation platform within the Strata Development Environment for the NCV7694 Safety Controller for Infra-Red LED Illumination to Complement the Image Sensor for Automotive Applications from ON Semiconductor. Strata gives the developer access to any collateral one may need, including datasheets, BOMs and schematics, as well as providing a user interface for testing the performance of the NCV7694.
2. USER GUIDE This section provides step-by-step manual on how to use the STR-DMS-NCV7694-GEVK. In general it consist of three boards: - STR-DMS-NCV7694-GEVB (GazeT housing IR LED board) STR-DMS-CONTROL-GEVB (Control board to adjust Voltage and current on IR LEDs) STR-ASSISTED-RSL10-GEVB (RSL10 SoC based Strata interface module) Connection of the m odules w hen PWM flash taken from STR-ASSISTED-RSL10-GEV B The STR-DMS-NCV7694-GEVK is delivered as platform that can operate as standalone evaluation kit.
STR-DMS-NCV7694-GEVK consists of two connectors: i. Three – pin connector for Supply Voltage, Ground and PWM flash signal from Image Sensor ii. Six – pin connector for flat FPC cable that provides control voltage for I_LED and Vout_DCDC adjustment, PWM from Strata together with Diagnostic pin output of NCV7694. Fig. 2: 3-pin and 6-pin connectors on the back side of STR-DMS-NCV7694-GEVB LED module Single Control board STR-DMS-CONTROL-GEVB can service up to three STR-DMS-NCV7694-GEVB GazeT IR LED modules.
2. Connect the other part of 6-pin FPC cable into control board STR-DMS-CONTROL-GEVB as shown in Fig.4. Blue part of the FPC cable must go outside of the control board. User can control up to three GazeT IR LED driver modules over 6-pin FPC cables. Each module will have the same V_out DCDC and I_LED current and PWM flash signal. Fig. 4: connection of the 6-pin FPC cable from GazeT LED driver module (STR-DMS-NCV7694-GEVB) into Control board (STR-DMS-CONTROL-GEVB) 3.
4. After the power supply is ON, connect the Mini USB cable to STR-DMS-CONTROL-GEVB and to computer 5. Once the system is fully powered, user can manipulate and test the performance of the system from Strata / Serial Console Interface (SCI). The current DMS allows variation (i.e. variables) of LED current, NCV890204 output voltage and T_ON period (i.e. ON time of PWM flash pulse) by means of the STR-DMS-CONTROL-GEVB and STR-ASSIST-RS10-GEVB.
Examples: 1. turn ON I_LED to 0.7A { "cmd": "set_pwm1", "payload": { "status": true, "current": 0.7 } } 2. turn OFF I_LED { "cmd": "set_pwm1", "payload": { "status": false, "current": 0.7 } } Strata GUI: - Available within Strata Development Studio - Developed to make the DMS more stable, user friendly to control and operate within safety limits - Operation restricted to “Safety Operation Area (SOA)” to reduce potential risk of damage or the DMS malfunction. LED current levels below 0.
Fig. 6: Control panel for Flash PWM, VOUT (DCDC converter) and I_LED. Safety operating area included. SOA area is implemented in the Strata GUI. Accepted at the conditions: NCV890204 VOUT=10.0V; f_PWM_flash=62Hz. LED current levels below 0.7A are unavailable.
Connection of the m odules w hen PWM flash taken from Im age Sensor The STR-DMS-NCV7694-GEVK as platform can operate with Image sensor. Using the Strata interface and control board, one can adjust: i. Output voltage of DCDC converter NCV890204 ii. LED current amplitude I_LED Image Sensor will serve for PWM Flash generation set out of the DevWare system. Note: When operating with Image sensor, PWM flash out of Strata module is not used, make sure that jumper CON4 is unplugged Fig.
three pin cabling as shown on Fig. 8. Image sensor module consists of supply connector that user hooks up to the external power supply. Set the voltage to 13V (current limitation 5A). Make sure you have the setup completed per below with 6-pin FPC cables interconnection between GazeT LED modules and Control board, IS to Deserializer – Demo3. Turn the power supply ON. Fig.
After the power supply is ON, connect the Mini USB cable to STR-DMS-CONTROL-GEVB and to computer Once the system is fully powered, user can manipulate and test the performance of the system from Strata / Serial Console Interface (SCI) together with DevWare. The interface is the same except PWM_flash Signal generated out of the Image Sensor over three pin connector. Important note: DevWare generates PWM flash signal directly from Image Sensor.
Fig. 9: Example of well exposed image, 3 LEDs connected, Ton ≈ 500us, I_LED = 4.5 A Background objects also illuminated apart from the subject http://onsemi.
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