US 9,813,084 B2
Transmitter circuit, semiconductor apparatus and data transmission method
Koichi Takeda, Tokyo (JP); Hirokazu Nagase, Tokyo (JP); and Shinpei Watanabe, Tokyo (JP)
Assigned to RENESAS ELECTRONICS CORPORATION, Tokyo (JP)
Filed by RENESAS ELECTRONICS CORPORATION, Tokyo (JP)
Filed on Mar. 10, 2016, as Appl. No. 15/66,900.
Claims priority of application No. 2015-053444 (JP), filed on Mar. 17, 2015; and application No. 2015-180395 (JP), filed on Sep. 14, 2015.
Prior Publication US 2016/0277043 A1, Sep. 22, 2016
Int. Cl. H04B 1/04 (2006.01); H04L 25/02 (2006.01); H01L 23/60 (2006.01); H04B 1/40 (2015.01); H04B 5/00 (2006.01); H04L 1/00 (2006.01)
CPC H04B 1/04 (2013.01) [H01L 23/60 (2013.01); H04B 1/40 (2013.01); H04L 25/0266 (2013.01); H01L 2924/16152 (2013.01); H04B 5/0012 (2013.01); H04B 5/0075 (2013.01); H04B 5/0081 (2013.01); H04L 1/0041 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A transmitter circuit comprising:
a pulse generating circuit generating a pulse signal based on edges of input data;
a first output driver outputting, based on the pulse signal, a first output pulse signal according to one of the edges to a first end of an external insulating coupling element;
a second output driver outputting, based on the pulse signal, a second output pulse signal according to other one of the edges to a second end of the insulating coupling element; and
an output stop circuit stopping the first and second output pulse signals from being output for a prescribed period from when a power supply voltage is turned on,
wherein the output stop circuit includes a first capacitor element connected between a power supply and a node; and
the stop of the output of the first and second output pulse signals is released when a voltage at the node reduces below a predetermined level, wherein
the output stop circuit further includes:
a latch circuit connected between the node and a ground; and
a timer, wherein
the latch circuit lowers the voltage at the node below the predetermined level in response to a signal output from the timer.