Semiconductor integrated circuit device

• US 9,575,525 B2
• Filed: 02/26/2013
• Issued: 02/21/2017
• Est. Priority Date: 05/20/2009
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: Asano, Masahiro, Nishihara, Yuriko
• Primary Examiner(s): Tsai, Henry
• Assistant Examiner(s): DALEY, CHRISTOPHER ANTHONY
• Application Number:
  US13/777,702
• Publication Number:
  US 20130179702A1
• Time in Patent Office: 1,456 Days
• Field of Search: 713/300, 327/112
• US Class Current: 1/1
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: G06F 1/3234 Power saving characterised by the action undertaken
• CPC Class Codes: G06F 13/36 for access to common bus or bus system
• CPC Class Codes: H04L 12/40013 Details regarding a bus controller
• CPC Class Codes: H04L 12/40039 Details regarding the setting of the power status of a node according to activity on the bus
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

Power supply of ECUs connected to a communication network is optimally controlled so that power consumption is reduced. A transceiver/receiver converts a message of a differential signal received via a CAN bus into a digital signal. A select circuit determines whether the converted message is in a CAN format or a UART format. If it is in the UART format, the select circuit outputs a message to the UART circuit. A UART circuit determines whether the message matches a UART format. If matched, an ID determination circuit determines whether the input message is specifying a CAN ID of its own ECU. If it is the CAN ID of the ECU, the ID determination circuit outputs an enable signal to turn on a regulator and supply power to an MCU and an actuator.

Claims

1. A communication system for an automotive, comprising:

a plurality of electrical controller units, a first electrical controller unit of which has an active mode and a low consumption mode; and

a communication bus coupled with the electrical controller units, wherein

when the first electrical controller unit is in the low consumption mode,

a second electrical controller unit outputs a first message for activating the first electrical controller in a first predetermined time to the communication bus, and then outputs a second message including an ID signal of the first electrical controller unit to the communication bus, and

the first electrical controller unit receives the first message and the second message including the ID signal output by the second electrical controller unit from the communication bus, checks the ID signal whether the ID signal indicates the first electrical controller unit or not, and when the ID signal indicates the first electrical controller unit, the first electrical controller unit shifts to the active mode from the low consumption mode, and

no ID signal is included in the first message.

2. The communication system according to the claim 1, wherein the first predetermined time is longer than a time for datum in a message on the communication bus.

3. The communication system according to the claim 1, wherein the first electrical controller unit shifts to the low consumption mode from the active mode after waiting a second predetermined time from a completion of a power on sequence.

4. The communication system according to claim 1, wherein

the communication bus is a Control Area Network (CAN) bus, and

each of the electrical controller unit includes a CAN interface unit.

5. The communication system according to claim 1, wherein each of the electrical controller unit includes a memory for storing an ID thereof.