Circuit device with serial test interface and serial test mode procedure

摘要

The arrangement (IC) has a serial test interface (TIF) controlling a test type of operation and a housing (G) accommodating the serial test interface and a processor (CPU). A modulated supply voltage (VDD) is applied to a connecting contact (C1) for transmitting data and/or a clock pulse by making use of two voltage levels (V2, V3). The voltage levels are controlled and are not equal to a feed-in voltage level (V1) for supplying an operating voltage to the arrangement. An independent claim is also included for a serial test operation method for a circuit arrangement.