| 摘要 |
An integrated circuit device 1 such as a current sensor includes a circuit configuration 3 which is driven from supply rails (P1, P2) at a given operational voltage. An external data connection P7 is arranged to supply data to a controlling micro-controller 2 that operates at a running voltage different from the voltage for the device 1. An enable connection (6) couples an enabling signal from the micro-controller 2 at its running voltage to pin P8 on the device 1. In response, the circuit configuration 3 supplies data for the micro-controller 2, to the data pin P7. The integrated circuit device 1 includes control circuitry (R1, T1) responsive to the enabling signal applied to pin P8 to ensure that the data supplied at pin P7 is at a voltage compatible with the running voltage of the micro-controller 2. No pin to receive a rail voltage corresponding to the running voltage for the micro-controller 2 is needed for the integrated circuit device 1.
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