System design of QFN test handler using turntable

PI Zhisong, LU Jun, LIU Qian, CAO Panjiang
(Wuxi CMC Electronics Co., Ltd., Wuxi 214035, China)

Abstract: Highend test handler with high efficiency is required in domestic. Through consulting many documents and researching test handler using turntable of import carefully, system design of TX900 quad flat nolead package test handler was drawn up. The work principle of TX900 QFN test handler was discussed. Running process of the machine was described. The system structure model was built with modular design method. The structure design of all parts was illustrated in detail. The structure of electronic control and design of control software were introduced. The flow chart of control program was presented. At last key technologies and solutions of the machine were discussed. The machine is efficient, compatible and extensible. The whole system design lays a foundation for the realization of the QFN test handler using turntable.
Key words: quad flat nolead package(QFN); test handler; turntable; system design