Data processing device and data processing system

Patent metadata

Field	Value
Publication number	US-8981975-B2
Application number	US-201314095669-A
Country	US
Kind code	B2
Filing date	Dec 3, 2013
Priority date	Mar 31, 2009
Publication date	Mar 17, 2015
Grant date	Mar 17, 2015

Abstract

In AD conversion of a voltage, data continuity is ensured between the results of conversion after amplification and of direct conversion without amplification. In AD conversion operation, an analog signal output from a DA converter circuit is directly converted by an AD converter circuit, and the analog signal is converted after amplification with an expected gain of 2′. Based on resultant data, a gain of an amplifier circuit and an offset thereof are calculated. An analog signal to be enhanced in bit precision is amplified by the amplifier circuit and converted by the AD converter circuit, the offset is subtracted from the resultant conversion, and the result is multiplied by a ratio of the expected gain to the calculated gain to cancel gain error. Based on data with gain error canceled, acquisition of bit-extended conversion result data is performed to ensure continuity between data having different degrees of bit precision.

First claim

What is claimed is:

1. A data processing system comprising:
an attenuator having a attenuation ratio of 1/M; and
a microcomputer which comprises
a first conversion channel coupled to receive an analog signal;
a second conversion channel coupled to receive the analog signal via the attenuator;
an AD converter circuit coupled to convert both an output from the first conversion channel and an output from the second conversion channel;
a control circuit which outputs first AD…

Assignees

• Renesas Electronics Corp

Inventors

• Iso Yoshimi
• Kimura Kakeru
• Matsushima Tadashi
• Shimizu Yuji

Classifications

• H03M1/1009 Primary

  Electricity · mapped topic

• H03M1/183

  Electricity · mapped topic

• H03M1/12

  Electricity · mapped topic

• H03M1/1028 Primary

  Electricity · mapped topic