VEHICLE KEY FOR PASSIVE ACCESS SYSTEMS AND ASSOCIATED METHOD

A radio key (2) for an access system of a motor vehicle comprises a reception circuit (10) having at least three LF reception coils for low-frequency signal reception that are oriented in different spatial directions. The reception circuit (10) has a central control circuit (11) coupled to it, wherein the control circuit can use a microcontroller to adopt different operating states, at least one operating state of which is an idle state and one operating state of which is an active operating state. The reception circuit (10) is designed to wake the control circuit (11) from the reduced-power idle state when a signal is received via the LF reception coils. The central control circuit (11) having the microcontroller is designed to actuate the reception circuit, after being woken from the idle state, for forwarding the undecoded data stream, wherein the microcontroller decodes the undecoded data stream by executing a program externally to the reception circuit. 种用于机动车的进入系统的无线电钥匙(2)，具有：接收电路(10)，所述接收电路带有至少三个用于低频信号