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LTC4309IGN-PBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC4309IGN-PBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  LTC4309 6 4309fa ENABLE (Pin 1/Pin1): Connection Enable Input. This 1.4V digital threshold input pin enables or disables the LTC4309. For normal operation pull or connect ENABLE high. Driving ENABLE below the 0.8V threshold isolates SDAIN from SDAOUT, SCLIN from SCLOUT, asserts READY low, and prohibits automatic clock and stop bit generation during a fault condition. A rising edge on ENABLE after a fault has occurred forces a connection between SDAIN, SDAOUT and SCLIN, SCLOUT. Connect to VCC if unused. DISCEN (Pin 2/Pin 3 ): Bus Stuck Low Disconnect Enable Input. This pin, when high, allows the stuck low bus timeout circuitry to disconnect the bus in a fault condition. When connected to GND, this pin disables the circuitry that disconnects the bus under a fault condition; however, the FAULT pin will still go low. SCLOUT (Pin 3/Pin 4): Serial Clock Output. Connect this pin to a SCL bus segment where bus stuck low recovery is desired. If the output rise time accelerators are enabled, a pull-up resistor should be connected between this pin and a bus supply greater than or equal to VCC. Bus supplies can be lower than VCC if the output rise time accelerators are disabled. See Application Information section for detailed bus pull-up supply options. SCLIN (Pin 4/Pin 5): Serial Clock Input. Connect this pin to a SCL bus segment where isolation from bus stuck low issues is desired. If the input rise time accelerator is enabled, a pull-up resistor should be connected between this pin and a bus supply greater than or equal to VCC2. Bus supplies can be lower than VCC2 if the input rise time accelerators are disabled. See Application Information section for detailed bus pull-up supply options. ACC (Pin 5/Pin 6): Rise Time Accelerator Control Input. This nominal 0.7V threshold input pin enables and disables all rise time accelerators on the SDA and SCL pins. Connect ACC to GND to enable all four rise time accelerators or connect ACC to VCCtodisableallfourrisetimeaccelerators. Connect ACC to VCC2 to GND to enable the accelerators on SDAOUT and SCLOUT only. GND (Pin 6/Pin 8): Device Ground. Connect this pin to a ground plane for best results. READY (Pin 7/Pin 9): Connection Ready Status Output. This open-drain N-channel MOSFET pin pulls low when ENABLE is low, when the start-up and connection sequence described in the Operation section has not been completed, or when the LTC4309 disconnects the input and output pins due to a bus stuck low condition. READY goes high when ENABLE is high and connection is made between the input and output pins. Connect a pull-up resistor, typically 10k, from this pin to the bus pull-up supply. This pin can be left open if unused. FAULT(Pin8/Pin11):BusStuckLowTimeoutOutput.This open drain N-channel MOSFET output pulls low after 30ms when there is a bus stuck low condition on the output pins of the LTC4309. In normal operation FAULT is high. Connect a pull-up resistor, typically 10k, from this pin to the bus pull-up supply. This pin can be left open if unused. SDAIN (Pin 9/Pin 12): Serial Clock Input. Connect this pin to a SDA bus segment where isolation from bus stuck low issues is desired. If the input accelerator is enabled, a pull-up resistor should be connected between this pin and a bus supply greater than or equal to VCC2. Bus supplies can be lower than VCC2 if the input rise time accelerators are disabled. See Application Information section for detailed bus pull-up supply options. SDAOUT (Pin 10/Pin 13): Serial Clock Output. Connect this pin to a SCL bus segment where bus stuck low recovery is desired. If the output rise time accelerators are enabled, a pull-up resistor should be connected between this pin and a bus supply greater than or equal to VCC. Bus supplies can be lower than VCC if the output rise time accelerators are disabled. See Application Information section for detailed bus pull-up supply options. VCC2 (Pin 11/Pin 14): Supply Voltage Input for SDAIN and SCLIN Rise Time Accelerator Circuitry. VCC2 supplies the rise time accelerator circuitry on the input side. Bypass this pin to GND with a capacitor of at least 0.01μF and place close to VCC2 for best results. If VCC2 is connected to GND, the input side rise time accelerator circuitry is disabled, regardless of ACC. (DE12/GN16) PIN FUNCTIONS |
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