Microprocessor Core Supply Voltage Set by 1~2C~(TM)Bus Without VID Lines -

摘要

Many modern CPUs run at two different clock speeds, where each speed requires a different core operating voltage to assure optimum performance. These voltages are documented in the manufacturer's VID (voltage identification) section of the CPU specification. Some new DC/DC converters (the LTC~(R)1909, for example) have built-in VID control that supports dual programmable output voltages, but many existing converters do not. The LTC1699 is a precision 2-state resistive divider that uses a simple SMBus interface to allow VID control on non-VID-enabled DC/DC converters. No dedicated VID lines are required.