| 发明名称 |
Voltage detection circuit and method for controlling the same |
| 摘要 |
A voltage detection circuit including a voltage selection circuit that outputs a voltage commensurate with a power supply voltage as a first voltage; a detection voltage selection circuit that selects either an external input voltage inputted from an external terminal or the first voltage according to a first control signal, and outputs it as a comparison voltage; a reference voltage generation circuit that generates a reference voltage; a comparator that compares the reference voltage and the comparison voltage, and outputs the comparison result as a detection signal; a control circuit that generates the first control signal so that the detection voltage selection circuit may output either the first voltage or the external input voltage as the comparison voltage by time division, and when a variation of the first voltage is detected, generates the first control signal so that the detection object selection circuit may output the first voltage as the comparison voltage. |
| 申请公布号 |
US8749224(B2) |
申请公布日期 |
2014.06.10 |
| 申请号 |
US201113188100 |
申请日期 |
2011.07.21 |
| 申请人 |
Renesas Electronics Corporation |
发明人 |
Matsushita Rumi;Nakatsu Shinichi;Ishihara Kuniyasu;Eto Kimiharu;Indo Seiya;Shimoda Hirotaka |
| 分类号 |
G01R19/00 |
主分类号 |
G01R19/00 |
| 代理机构 |
|
代理人 |
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| 主权项 |
1. A voltage detection circuit, comprising:
a voltage selection circuit that outputs a voltage commensurate with a power supply voltage as a first voltage; a detection voltage selection circuit that selects either an external input voltage inputted from an external terminal or the first voltage according to a first control signal, and outputs it as a comparison voltage; a reference voltage generation circuit that generates a reference voltage; a comparator that compares the reference voltage and the comparison voltage, and outputs the comparison result as a detection signal; and a control circuit that generates the first control signal so that the detection voltage selection circuit may output either the first voltage or the external input voltage as the comparison voltage for adjustable selection periods, and when a variation of the first voltage or the power supply voltage is detected, generates the first control signal so that the detection voltage selection circuit outputs the first voltage as the comparison voltage.
|
| 地址 |
Kanagawa JP |
