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LTC4100 Datasheet(PDF) 11 Page - Linear Technology |
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LTC4100 Datasheet(HTML) 11 Page - Linear Technology |
11 / 48 page LTC1760 11 1760fa LOPWR (Pin 12): LOPWR Comparator Input from SCN External Resistor Divider to GND. If the voltage at LOPWR pin is lower than the LOPWR comparator threshold, then system power has failed and power is autonomously switched to a higher voltage source, if available. DCDIV (Pin 16): External DC Source Comparator Input from DCIN External Resistor Divider to GND. If the voltage at DCDIV pin is above the DCDIV comparator threshold, then the AC_PRESENT bit is set and the wall adapter power is considered to be adequate to charge the batteries. If DCDIV rises more than 1.8V above VCC, then all of the power path switches are latched off until all power is removed. A capacitor from DCDIV to GND is recommended to prevent noise-induced false emergency turn-off conditions from being detected. Refer to “Section 8.3” and “Typical Application”. DCIN (Pin 41): Supply. External DC power source. A 0.1μF bypass capacitor must be connected to this pin as close as possible. No series resistance is allowed, since the adapter current limit comparator input is also this pin. Internal Power Supply Pins VDDS (Pin 20): Power Supply for SMBus Accelerators. Also used in conjunction with MODE pin to modify the LTC1760 operating mode. GND (Pin 24): Ground for Low Power Circuitry. VCC2 (Pin 25): Power Supply is used Primarily to Power Internal Logic Circuitry. Must be connected to VCC. PGND (Pin 38): High Current Ground Return for BGATE Driver. VCC (Pin 40): Internal Regulator Output. Bypass this output with at least a 2μF to 4.7μF capacitor. Do not use this regulator output to supply external circuitry except as shown in the application circuit. SBS Interface Pins SCL2 (Pin 17): SMBus Clock Signal to Smart Battery 2. Do not connect to an external pull-up. The LTC1760 connects this pin to an internal pull-up (IPULLUP) when required. SCL (Pin 18): SMBus Clock Signal to SMBus Host. Also used to determine flashing rate for stand-alone charge indi- cators. Requires an external pullup to VDDS (normal SMBus operating mode). Connected to internal SMBus accelerator. SCL1 (Pin 19): SMBus Clock Signal to Smart Battery 1. Do not connect to an external pull-up. The LTC1760 connects this pin to an internal pull-up (IPULLUP) when required. SDA2 (Pin 21): SMBus Data Signal to Smart Battery 2. Do not connect to an external pull-up. The LTC1760 connects this pin to an internal pull-up (IPULLUP) when required. SDA (Pin 22): SMBus Data Signal to SMBus Host. Also used to indicate charging status of Battery 2. Requires an external pullup to VDDS. Connected to internal SMBus accelerator. SDA1 (Pin 23): SMBus Data Signal to Smart Battery 1. Do not connect to an external pull-up. The LTC1760 connects this pin to an internal pull-up (IPULLUP) when required. MODE (Pin 26): Used in conjunction with VDDS to allow SCL, SDA and SMBALERT to indicate charging status. May also be used as a hardware charge inhibit. TH2B (Pin 27): Thermistor Force/Sense Connection to Smart Battery 2 SafetySignal. Connect to Battery 2 thermistor through resistor network shown in “Typical Application.” TH2A (Pin 28): Thermistor Force/Sense Connection to Smart Battery 2 SafetySignal. Connect to Battery 2 thermistor through resistor network shown in “Typical Application.” SMBALERT (Pin 29): Active Low Interrupt Pin. Signals SMBus Host that there has been a change of status in battery or AC presence. Open drain with weak current source pull-up to VCC2 (with Schottky to allow it to be pulled to 5V externally). Also used to indicate charging status of Battery 1. TH1A (Pin 30): Thermistor Force/Sense Connection to Smart Battery 1 SafetySignal. Connect to Battery 1 thermistor through resistor network shown in “Typical Application.” TH1B (Pin 31): Thermistor Force/Sense Connection to Smart Battery 1 SafetySignal. Connect to Battery 1 thermistor through resistor network shown in “Typical Application.” PIN FUNCTIONS |
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