US 2006/0132215 A1Published application

Signal converting circuit

AssigneeHon Hai Precision Industry Co., Ltd.

InventorCheng-Kuo Chang

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Abstract

A signal converting circuit includes a voltage level converter circuit, a power circuit, a signal separation circuit, a signal modifying circuit, and a clamping circuit. The power circuit provides voltage to the signal modifying circuit and the voltage level converter circuit. The voltage level converter circuit converts signals from the RS232 interface to I2C interface compliant signals. When the I2C interface transmits signal to the RS232 interface, the signal separation circuit separates signal from the RS232 interface into two separate signals. The signal modifying circuit receives controlling signals sent from the RS232 interface and modifies the signals into a standard square wave signal, the modified standard square wave signal is sent to the clamping circuit. The clamping circuit clamps the voltage level of the signal according to the level that the I2C interface accepts.

Claims16

Dependent claims

A signal converting circuit adapted for interconverting RS232 signals with I2C signals, the signal converting circuit comprising:

a voltage level converter circuit, a first input end of the voltage level circuit connected to an SDA line of an I2C interface, an output end of the voltage level circuit connected to a received data pin of an RS232 interface;
a power circuit, an input end of the power circuit connected to a request-to-send pin of the RS232 interface and a power supply respectively, and an output end of the power circuit connected to a second input end of the voltage level converter circuit;
a signal separation circuit for separating a signal into two separate signals, an input end of the separation circuit connected to a transmitted data pin of the RS232 interface;
a signal modifying circuit, a first input end of the signal modifying circuit connected to a first output end of the signal separation circuit, a second input end of the signal modifying circuit connected to the output end of the power circuit, a controlling end of the signal modifying circuit connected to the request-to-send pin of the RS232 interface;
and
a clamping circuit, a first input end of the clamping circuit connected to a second output end of the signal separation circuit, a second output end of the clamping circuit connected to an output end of the signal modifying circuit, a first output end of the clamping circuit connected to the SDA line of the I2C interface, and the second output end of the clamping circuit connected to an SCL line of the I2C interface, the clamping circuit adapted for limiting the signal sent from the signal separation circuit and the signal modifying circuit to the specific voltage of the SDA line and SCL line.

3 more elements

A signal converting circuit for converting RS232 signals to I2C signals, an I2C interface comprising an SDA line and an SCL line, an RS232 interface comprising a power pin, a transmitted data pin, and a request-to-send pin, the signal converting circuit comprising:

a power circuit, an input end of the power circuit connected to the request-to-send pin of the RS232 interface and a power supply respectively;
a signal separation circuit for separating signals into two separate signals, an input end of the separation circuit connected to the transmitted data pin of the RS232 interface;
a signal modifying circuit, a first input end of the signal modifying circuit connected to a first output end of the signal separation circuit, a second input end of the signal modifying circuit connected to an output end of the power circuit, a controlling end of the signal modifying circuit connected to the request-to-send pin of the RS232 interface;
and
a clamping circuit, a first end of the clamping circuit connected to the second output end of the signal separation circuit, a second output end of the clamping circuit connected to the output end of the signal modifying circuit, a first output end of the clamping circuit connected to the SDA line of the I2C interface and the second output end of the clamping circuit connected to the SCL line of the I2C interface, the clamping circuit adapted for limiting signals sent from the signal separation circuit and the signal modifying circuit to the specific voltage of the SDA line and SCL line.

2 more elements

Dependencies are inferred from the claim text.