一,客户测试要求
1, 针对此汽车背光控制板测试其功能,
2, 输出状态不同,测试输出状态时否正常
3, 量测LED的电压,测试期导通电流
4, 由于汽车电子对功耗比较严格,需测各种状态的产品总电流
5, 测试LED亮暗状态是否正常,
6, 要测试按钮开关功能
7, 测试待测板上稳压IC输出是否正常
8, 采用单片机(MCU)控制,LCD屏显示结果
9, 测试完成后,对PASS产品进行盖章标识
二,测试规格
1,All Diodes "Ds" are LEDs with Vf = ~1.9 to 3.5 Volts (depending on color)
TEST:Confirm Presence, Correct Polaritiy, Correct Vf (Establish Orange LED Vf range for BMW circuit
2,U1 LED Constant Current Driver
Test:Confirm LED Driver Sinks Current on each channel (U1 pin 7-10).
Step: 1, Supply 5 Volts to Pin 1 & Anodes of LEDs
2, Supply 5 Volts to Pin Boost (TP8)
3, Apply LOW to PWM (TP32) confirm LEDs OFF
4, Apply HIGH 5 Volts to PWM (TP32) confirm that LEDs are ON
(confirm via voltages at (TP7, 10, 25, 26) and total current draw
5, Supply 5 Volts to Pin 1 & Anodes of LEDs
6, Supply LOW to Pin Boost (TP8)
7, Apply LOW to PWM (TP32) confirm LEDs OFF
8, Apply HIGH 5 Volts to PWM (TP32) confirm that LEDs are ON
(confirm via voltages at TP7, 10, 25, 26) and total current draw
三,实现方案:
1, 采用单片机控制,全自动测试
2, 单片机控制板有16组输出,给出高低电平信号
3, 单片机控制板有16组输入,量测电压,电流
4, 采用LCD屏显示测试进度及测试结果
5, 使用LED灯显示测试结果,方便操作员判断。
硬件结构图:
三, 此控制模块应用领域:
1, 工控板的功能测试
2, 汽车电子中控板,尾灯,刹车灯控制电路板测试
3, 家电类产器,电磁炉,电饭煲,电冰箱,空调,微波炉,洗衣机等产品的功能测试
4, 新能源光电产品的功能测试
5, LED照明类产品的功能测试