Two-wire serial interface and protocol
First Claim
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1. A serial transmission method using a two-wire serial interface, comprising:
- coupling a master device with a slave device through the two-wire serial interface, wherein the slave device comprises a first and second external pin coupled with an interface control unit configured to decode signals transmitted through the two-wire serial interface and an analog functional unit having a modulator input generating an output signal on a third external pin of the slave device; and
performing the steps of;
operating the two-wire serial interface as a synchronous serial interface, wherein a first wire is operated as a data signal wire and a second wire as a clock signal wire;
transmitting by the master device a first synchronous serial signal via said two-wire serial interface, wherein the interface control unit of the slave device receives the first synchronous serial signal and is configured to wake-up the slave device and to directly connect one of the first or second wire with the functional unit; and
thereafter transmitting by the master device an asynchronous data signal on the one of the first or the second wire of the two-wire serial interface, wherein the logic states of the asynchronous data signal directly modulate an analog output signal at the third external pin of the slave device.
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Abstract
In a serial transmission method using a two-wire serial interface, a master device transmits a first synchronous serial signal via the two-wire serial interface to wake-up a slave device followed by an asynchronous data transmission on one of the two-wires of the two-wire serial interface. The asynchronous data signal directly controls a function of the slave device.
33 Citations
29 Claims
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1. A serial transmission method using a two-wire serial interface, comprising:
coupling a master device with a slave device through the two-wire serial interface, wherein the slave device comprises a first and second external pin coupled with an interface control unit configured to decode signals transmitted through the two-wire serial interface and an analog functional unit having a modulator input generating an output signal on a third external pin of the slave device; and
performing the steps of;operating the two-wire serial interface as a synchronous serial interface, wherein a first wire is operated as a data signal wire and a second wire as a clock signal wire; transmitting by the master device a first synchronous serial signal via said two-wire serial interface, wherein the interface control unit of the slave device receives the first synchronous serial signal and is configured to wake-up the slave device and to directly connect one of the first or second wire with the functional unit; and thereafter transmitting by the master device an asynchronous data signal on the one of the first or the second wire of the two-wire serial interface, wherein the logic states of the asynchronous data signal directly modulate an analog output signal at the third external pin of the slave device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 13. A system comprising a master device and a slave device coupled through a two-wire serial interface comprising a signal line and a clock line coupled first and second external pins of the slave device, wherein the master device is configured to control the slave device by controlling the two-wire serial interface to operate in a synchronous mode and to transmit a synchronous serial data signal via said two-wire serial interface to wake-up the slave device, wherein the slave device comprises a switch which after waking up the slave device is controlled to couple the one of the two-wires of the two-wire serial interface with an input of a modulator wherein the logic states of a data signal on the one of the two-wires of the two-wire serial interface directly modulates an analog function of the slave device.
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21. An integrated circuit device comprising:
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a two wire serial interface coupled with a first and a second external pin of the integrated circuit device, a switch coupled with the first external pin, a control unit coupled with said two-wire serial interface and configured to decode synchronous transmission data and to control said switch, and a functional unit coupled with said switch and with a third external pin of the integrated circuit device and being controlled by the control unit, wherein the control unit is operable to receive a first synchronous serial signal via said two-wire serial interface to wake-up the integrated circuit device and thereafter to control the switch to couple the first external pin with the functional unit, wherein the logic states of a data signal at the first pin directly control the functional unit of the integrated circuit device, wherein an analog signal which is directly modulated by said data signal is output at the third external pin. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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Specification