Toshiba TC9349AFG Manual

TC9349AFG2006-02-24982. A/D Converter Circuit ConfigurationThe A/D converter consists of a 6-bit D/A converter, a sample hold, a comparator, an A/D conversion latch and a controlcircuit. The 6-bit D/A converter and the comparator operate only when the BUSY bit is “1”. Therefore, the A/D converterconsumes no current when it is not operating. The half potential of VEE constant voltage can be selected as the A/D input.The A/D converter operates on the doubled voltage VDB (V DD × 2).Note: Set to “1” the I/O port –6 (N-ch open-drain) output data corresponding to the A/D input pin to be used, touse the pin in the input state.Note: The V EE contant-voltage potential is used for the LCD driver driving voltage and the reference voltage ofreduced-voltage detection circuit for the DC-DC converter for CPU and VT.Note: Voltage of 0 V to VDB pin level can be applied to the A/D input pin.111213149ADin1 (P6-0)SampleholdADin2 (P6-1)ADin3 (P6-2)ADin4 (P6-3)VDDControlcircuitDecoderSTA BUSYA/D conversion latchBUSYA/D conversion dataComparatorSEL0~2AD0AD5VEE constant-voltagecircuit V EEBUSYV DB(VDD doubled voltage)RR 3R/2R/2 R~