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LTC4308IMS8-PBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC4308IMS8-PBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTC4308 10 4308f When powering up into a bus stuck low condition, the connection circuitry connecting the SDA and SCL pins are not activated. 30ms after UVLO, automatic clocking and stop bit generation takes place as described above. READY Digital Output This pin provides a digital flag which is low when either ENABLE is low, the start-up sequence described earlier in this section has not been completed, or the LTC4308 has disconnected the input and output busses due to a bus stuck low condition. READY goes high when ENABLE is high and start-up is complete. The pin is driven by an open-drain pull-down device capable of sinking 3mA while holding 0.4V on the pin. Connect a resistor to the bus pull-up supply to provide the pull-up. ENABLE When the ENABLE pin is driven below 0.45V with respect to the LTC4308’s ground, the input pin is disconnected from the output pin and the READY pin is pulled low. When the pin is driven above 0.75V, the part waits for data transactions on both the input and output pins to be complete (as described in the Start-Up section) before connecting the two pins. At this time the internal pull-down on READY releases. A rising edge on ENABLE after a bus stuck low condition has occurred forces a connection between SDAIN, SDAOUT, and SCLIN, SCLOUT even if the bus stuck low condition has not been cleared. At this time the 30ms timer is reset, but not disabled. Rise Time Accelerators Once connection has been established, rise time accelera- tor circuits on SDAOUT and SCLOUT are enabled. During positive bus transitions of at least 0.8V/μs, the rise time accelerators provide strong, slew-limited pull-up currents to force the bus voltage to rise at a rate of 100V/μs. The rise time accelerators significantly improve reli- ability and performance in I2C systems in several ways. First, due to the accelerator’s significantly lower pull-up impedance, as compared to the bus pull-up resistance, the system is less susceptible to noise on rising edges, providing smooth, controlled transitions for both small and large systems. Second, the accelerators allow users to choose larger bus pull-up resistors, reducing power consumption and improving logic low noise margins or to design with bus capacitances beyond those specified in the I2C specifications. For these reasons, it is strongly recommended that users choose bus pull-up resistors that guarantee the output busses will rise on their own at a rate of at least 0.8 V/μs to ensure activation of the accelerators. See the Applications Information section for selecting pull-up resistor sizes. It is important to connect SDAOUT and SCLOUT pins to a bus whose pull-up supply is equal to or greater than the LTC4308’s supply to ensure the accelerators do not source current through the pull up resistors into the pull- up supply. The rise time accelerators are internally disabled until the sequence of events described in the start-up section has been completed, as well as during automatic clocking and stop bit generation for a bus stuck low recovery event. OPERATION |
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