JP2009267471A5 - - Google Patents

Claims (4)

A scan type AD conversion method for successively AD converting analog signals from a plurality of sensors,
A scan type AD conversion method , wherein the analog signals from the plurality of sensors are sequentially selected by sequence control, AD conversion is performed, and serial data is output . Multiple sensors,
A multiplexer having a plurality of ports, select the port sequential manner, it outputs one of the analog signals of the plurality of sensors for connecting said plurality of sensors,
An AD converter connected to the multiplexer, the analog signal to AD conversion, and outputs the serial data,
And a sequencer connected to the multiplexer.
The scan sequence AD conversion system , wherein the sequencer outputs a port select signal to the multiplexer, and the multiplexer sequentially selects the ports using the port select signal as a trigger . The sequencer is connected to the AD converter;
The scan type AD conversion according to claim 2, wherein the sequencer outputs a chip select signal to the AD converter, and the AD converter starts the AD conversion with the chip select signal as a trigger. system. A microcomputer is connected to the sequencer,
The sequencer generates a serial clock on the basis of an external clock output from the microcomputer,
The AD converter scan type AD conversion system of claim 2 or 3, characterized in that outputs serial data to the external clock as a trigger.