The MSC1215-xx is a 1/2-duty vacuum fluorescent display tube driver implemented in BiCMOS technology. This LSI consists of a 37-bit shift register, 34 latches, an analog dimming circuit, (a PWM conversion circuit), a 34 keyscan circuit, a 6ch-6-bit A/D converter and 17 segment drivers, and 2-grid pre-drivers. The MSC1215-xx has capabilities of displaying audio system frequencies and various informations on a VFD tube for the automobile application and also interfacing with keyboard inputs and on an analog volume input.