Slave communication device and bus communication system
AssigneeDenso Corporation
InventorsToshiaki Iwasaki, Susumu Tsuruta, Kouichi Maeda
Life of this patent
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Abstract
A slave communication device is connected to a master communication device through a single bus, and transmits a data signal according to a synchronization signal transmitted from the master communication device. The slave communication device includes a current reduction unit that reduces a current flowing into the bus from the slave communication device at least in a period where the synchronization signal is transmitted from the master communication device.
Claims15
A slave communication device to be connected to a master communication device through a single bus and to transmit a data signal according to a synchronization signal that is intermittently transmitted from the master communication device at a predetermined transmission interval, the slave communication device comprising:
- a receiver circuit that receives the synchronization signal transmitted from the master communication device;
- a synchronization circuit that generates a synchronization timing based on the synchronization signal;
- a driver circuit that begins to transmit the data signal, in a period where the synchronization signal is transmitted, by superimposing the data signal on the synchronization signal;
- a bus connection line that connects the driver circuit and the receiver circuit to the bus;
- a pull-up resistor through which the bus connection line is coupled to a power supply voltage;
- and
- a current reduction unit that reduces a current flowing into the bus from the slave communication device by reducing a current flowing into the bus from the bus connection line in the period where the synchronization signal is transmitted from the master communication device.
A bus communication system comprising:
- a master communication device transmitting a synchronization signal;
- and
- a slave communication device connected to the master communication device through a single bus, wherein
- the master communication device intermittently transmits the synchronization signal at a predetermined transmission interval,
- the slave communication device further includes:
- a receiver circuit that receives the synchronization signal;
- a synchronization circuit that generates a synchronization timing based on the synchronization signal;
- a driver circuit that transmits the data signal, in a period where the synchronization signal is transmitted from the master communication device, by superimposing on the synchronization signal;
- a bus connection line that connects the driver circuit and the receiver circuit to the bus;
- a pull-up resistor through which the bus connection line is coupled to a power supply voltage, and
- a current reduction unit that reduces a current flowing into the bus from the slave communication device by reducing a current flowing into the bus from the bus connection line in the period where the synchronization signal is transmitted from the master communication device.
A slave communication device to be connected to a master communication device through a single bus and to transmit a data signal by superimposing on a synchronization signal that is intermittently transmitted from the master communication device at a predetermined transmission interval, the slave communication device comprising:
- a receiver circuit that receives the synchronization signal transmitted from the master communication device;
- a synchronization circuit that generates a synchronization timing based on the synchronization signal;
- a driver circuit that begins to transmit the data signal based on the synchronization timing, in a period where the synchronization signal is being transmitted, by superimposing the data signal on the synchronization signal;
- and
- a current reduction unit that reduces a current flowing into the bus from the slave communication device, the current reduction unit being activated in the period where the synchronization signal is being transmitted from the master communication device.
Dependencies are inferred from the claim text.