SIM card communication circuit, related apparatus, and control method

A terminal device, comprising a subscriber identity module (SIM) card communication circuit, comprising:

• a controller;
• a switch;
• a first card slot;
• a metal oxide semiconductor (MOS) transistor;
• and
• an embedded SIM (ESIM) chip;
• wherein the controller is connected to an input terminal of the switch, and a first output terminal and a second output terminal of the switch are respectively connected to the first card slot and the ESIM chip;
• wherein the controller is configured to:
• control the switch to choose to connect to a first physical SIM card in the first card slot when receiving a first message;
• and
• control the switch to be connected to the ESIM chip when receiving a second message, to implement connection between the controller and the ESIM chip;
• wherein the MOS transistor is located between the switch and the ESIM chip;
• and
• wherein the controller is further configured to:
• control the MOS transistor to be turned on when receiving the first message, so that the ESIM chip is maintained at a low level;
• or
• control the MOS transistor to be turned off when receiving the second message.

An electronic, device comprising a subscriber identity module (SIM) card communication circuit, comprising:

• a controller;
• a switch;
• a first card slot;
• and
• an embedded SIM (ESIM) chip;
• wherein the controller is connected to an input terminal of the switch, and a first output terminal and a second output terminal of the switch are respectively connected to the first card slot and the ESIM chip;
• wherein the controller is configured to:
• control the switch to choose to connect to a first physical SIM card in the first card slot when receiving a first message;
• and
• control the switch to be connected to the ESIM chip when receiving a second message, to implement connection between the controller and the ESIM chip;
• and
• wherein the switch further comprises a nineteenth port, a twentieth port, and a twenty-first port, the nineteenth port is connected to a twelfth port, the twentieth port is grounded, and the twenty-first port is open-circuited, and the twelfth port is used to transmit a clock (CLK) signal to the ESIM chip.

A subscriber identity module (SIM) card control method, comprising:

• receiving, by a controller of a SIM card communication circuit, first information for indicating selection of a first physical SIM card in a first card slot, and controlling, by the controller, a switch of the SIM card communication circuit to choose to connect to the first physical SIM card in the first card slot based on the first information;
• or
• receiving, by the controller, second information for indicating selection of an embedded SIM (ESIM) chip, and controlling, by the controller, the switch to choose to connect to the ESIM chip based on the second information;
• and
• wherein the controller is connected to an input terminal of the switch, and a first output terminal and a second output terminal of the switch are respectively connected to the first card slot and the ESIM chip.