PROBLEM TO BE SOLVED: To provide a diagnosis circuit with which it is possible to diagnose a monitoring circuit that monitors a power supply voltage during regular operation.SOLUTION: According to one embodiment, the diagnosis circuit comprises: a control unit for cyclically switching one of the voltage values of a monitoring object voltage Vm that corresponds to a power supply voltage VO1 when the power supply voltage VO1 is normal and a monitoring reference voltage Vmref that corresponds to a reference voltage Vref to a first voltage value and a second voltage value so that the up/down relation of respective voltage values of the monitoring object voltage Vm and the monitoring reference voltage Vmref is cyclically switched; a monitoring circuit for comparing the monitoring object voltage Vm and the monitoring reference voltage Vmref; and a determination circuit for determining whether the power supply voltage VO1 is normal or not, and whether the monitoring circuit is faulty or not on the basis of the monitoring result M1 of the monitoring circuit and the voltage value information of the monitoring object voltage Vm or the monitoring reference voltage Vmref cyclically switched by the control unit.SELECTED DRAWING: Figure 3
【課題】電源電圧を監視する監視回路の診断を通常動作中に行うことが可能な診断回路を提供すること。【解決手段】一実施の形態によれば、診断回路は、電源電圧VO1が正常である場合における電源電圧VO1に対応する監視対象電圧Vmと、基準電圧Vrefに対応する監視用基準電圧Vmrefと、のそれぞれの電圧値の上下関係が周期的に切り替わるように、監視対象電圧Vm及び監視用基準電圧Vmrefの何れか一方の電圧値を第1電圧値及び第2電圧値に周期的に切り替える制御部と、監視対象電圧Vmと監視用基準電圧Vmrefとを比較する監視回路と、監視回路の監視結果M1、及び、制御部によって周期的に切り替えられる監視対象電圧Vm又は監視用基準電圧Vmrefの電圧値の情報に基づいて、電源電圧VO1が正常であるか否か、及び、監視回路が故障しているか否かを判定する判定回路と、を備える。【選択図】図3
DIAGNOSIS CIRCUIT, SEMICONDUCTOR DEVICE, ONBOARD ELECTRONIC CONTROL UNIT, AND DIAGNOSIS METHOD BY DIAGNOSIS CIRCUIT
診断回路、半導体装置、車載用電子制御ユニット及び診断回路による診断方法
2017-06-15
Patent
Elektronische Ressource
Japanisch
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