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1. 发明授权

US06545508B2 Detection of clock signal period abnormalities 失效
公开(公告)号：US06545508B2
公开(公告)日：2003-04-08
申请号：US10066508
申请日：2002-01-31
申请人： Hisanori Senba
发明人： Hisanori Senba
IPC分类号： H03K3013
CPC分类号： G01R31/31727 , H03K5/159 , H03K5/19
摘要： A clock monitoring circuit is disclosed for detecting that the period of a clock signal has become shorter than a predetermined time interval. The clock monitoring monitoring circuit comprises a first and second flip-flop circuits that are D-type flip-flops, a delay circuit, and a gate circuit. The second flip-flop circuit receives as an input signal the output signal of the first flip-flop circuit. The output signal of the second flip-flop circuit is delayed a fixed time interval by the delay circuit and then supplied as an input signal to the first flip-flop circuit. The delay time of the delay circuit is set to be equal to the previously described predetermined period. The gate circuit receives the output signals of the first and second flip-flop circuits, and provides a signal whose logic level when the period of the received clock signal is the predetermined period differs from that when it is shorter than the predetermined period. The fact that the period of the clock signal has become shorter than the predetermined period can thus be detected.

2. 发明授权

US06944246B1 Data processing device for switching between terminal mode and RF mode with a digital circuit 失效
标题翻译：用数字电路切换终端模式与射频模式的数据处理装置
公开(公告)号：US06944246B1
公开(公告)日：2005-09-13
申请号：US09634501
申请日：2000-08-08
申请人： Hisanori Senba
发明人： Hisanori Senba
IPC分类号： G06K19/07 , G06K19/077 , H04L7/00
CPC分类号： G06K19/0723
摘要： An IC card is set to an RF mode by default when drive electric power starts being applied to the IC card. When both a clock signal and a reset signal are applied to respective connection terminals, the IC card switches to a terminal mode. The clock signal and the reset signal that are applied to the respective connection terminals can be detected without the need for an analog circuit such as a comparator. The IC card can be switched between the terminal mode in which only input signals applied to the connection terminals are effective and the RF mode in which only an input signal applied to a radio antenna is reliably effective, with only a digital circuit.
摘要翻译：当驱动电力开始施加到IC卡时，默认情况下将IC卡设置为RF模式。当时钟信号和复位信号都施加到各个连接端子时，IC卡切换到终端模式。可以在不需要诸如比较器的模拟电路的情况下检测施加到各个连接端子的时钟信号和复位信号。仅使用数字电路，IC卡可以在其中仅施加到连接端子的输入信号有效的终端模式和其中仅施加到无线电天线的输入信号的RF模式可靠地有效。

3. 发明授权

US06236320B1 Determination of an ambient temperature through the comparison of divided voltages 失效
标题翻译：通过比较分压来确定环境温度
公开(公告)号：US06236320B1
公开(公告)日：2001-05-22
申请号：US09513759
申请日：2000-02-25
申请人： Hisanori Senba
发明人： Hisanori Senba
IPC分类号： G08B1700
CPC分类号： G01K7/24 , G01K3/005
摘要： A temperature determining apparatus produces a predetermined reference voltage from an operating voltage supplied thereto from the outside, divides the reference voltage with a pair of resistance values having different temperature-resistance characteristics to produce a first divided voltage and divides the reference voltage with a pair of resistance values having the same temperature-resistance characteristic to produce a second divided voltage, and compares the first and second divided voltages to determine a threshold temperature. Since the reference voltage is constant as long as an ambient temperature is not changed even when the operating voltage is changed, the first and second divided voltages are not changed depending on the operating voltage, thereby allowing the determination of an ambient temperature with favorable accuracy in a wide range of operating voltages.
摘要翻译：温度测定装置从外部提供的工作电压产生规定的基准电压，用具有不同温度特性的一对电阻值对基准电压进行分压，得到第一分压，并用基准电压电阻值具有相同的耐温特性以产生第二分压，并且比较第一和第二分压以确定阈值温度。由于即使在工作电压变化的情况下环境温度也不变化，因为参考电压是恒定的，所以根据工作电压不会改变第一和第二分压，从而能够以良好的精度确定环境温度各种工作电压。

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