US 2007/0182452 A1 · Transmitter circuit, receiver circuit, interface circuit, and electronic instrument

Abstract

A transmitter circuit including: a current driver which current-drives differential signal lines; and a voltage driver which is electrically disconnected from at least one of the differential signal lines in a normal transfer mode, and is electrically connected to the at least one of the differential signal lines and voltage-drives the at least one of the differential signal lines in a power-down mode. The voltage driver outputs a power-down voltage for setting a receiver circuit to the power-down mode or a wakeup voltage for canceling the power-down mode of the receiver circuit, to the at least one of the differential signal lines. The current driver transmits a power-down command to the receiver circuit by current-driving the differential signal lines in the normal transfer mode.

Claims17

Dependent claims

A receiver circuit connected to a transmitter circuit which current-drives differential signal lines with the differential signal lines interposed, the receiver circuit comprising:

a current/voltage conversion circuit which performs a current/voltage conversion based on a current flowing through the differential signal lines, and outputs first and second voltage signals which form differential voltage signals;
a comparator which compares the first and second voltage signals and outputs an output signal;
and
a wakeup detection circuit which is set to a disabled state in a normal transfer mode and to an enabled state in a power-down mode, detects a wakeup voltage and outputs a signal which is used to cancel the power-down mode when the transmitter circuit has outputted the wakeup voltage to at least one of the differential signal lines by voltage drive.

1 more element

A receiver circuit connected to a transmitter circuit which current-drives differential signal lines with the differential signal lines interposed, the receiver circuit comprising:

a current/voltage conversion circuit which performs a current/voltage conversion based on a current which flows through the differential signal lines, and outputs first and second voltage signals which form differential voltage signals;
a comparator which compares the first and second voltage signals and outputs an output signal;
and
a wakeup detection circuit which outputs a wakeup signal when cancellation of a power-down mode is detected after setting of the receiver circuit to a power-down mode by outputting a power-down voltage to at least one of the differential signal lines from the transmitter circuit.

1 more element

Dependencies are inferred from the claim text.

Transmitter circuit, receiver circuit, interface circuit, and electronic instrument

Life of this patent

Transmitter circuit, receiver circuit, interface circuit, and electronic instrument

Life of this patent

Abstract

Claims17