发明名称 |
External oscillator resistor detection circuit |
摘要 |
An integrated circuit chip includes an RC oscillator circuit. The frequency of the output signal generated by the oscillator output signal is set as a function of a value of an included internal resistor integrated on the chip. An external resistor may be connected to the chip to allow a user to manipulate the oscillator output signal frequency. A detection circuit on the chip detects the presence of the connected external resistor. Responsive to that detection, a substitution circuit operates to substitute the connected external resistor for the internal resistor in the RC oscillator circuit. This effectuates a change of the frequency of the oscillator output signal to instead be set as a function of a value of that connected external resistor.
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申请公布号 |
US6624710(B2) |
申请公布日期 |
2003.09.23 |
申请号 |
US20010033991 |
申请日期 |
2001.12.27 |
申请人 |
SHENZHEN STS MICROELECTRONICS CO. LTD. |
发明人 |
TIAN LIJUN |
分类号 |
H03K3/03;(IPC1-7):H03B5/00;H03B5/24 |
主分类号 |
H03K3/03 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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