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LTC4259A-1 Datasheet(PDF) 8 Page - Linear Technology |
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LTC4259A-1 Datasheet(HTML) 8 Page - Linear Technology |
8 / 32 page LTC4259A-1 8 4259a1fa PI FU CTIO S RESET (Pin 1): Chip Reset, Active Low. When the RESET pin is low, the LTC4259A-1 is held inactive with all ports off and all internal registers reset to their power-up states. When RESET is pulled high, the LTC4259A-1 begins normal operation. RESET can be connected to an external capacitor or RC network to provide a power turn-on delay. Internal filtering of the RESET pin prevents glitches less than 1 µs wide from resetting the LTC4259A-1. Pull RESET high with ≤10k or tie to VDD. BYP (Pin 2): Bypass Output. The BYP pin is used to connect the internally generated – 20V supply to an exter- nal 0.1 µF bypass capacitor. Use a 100V rated 0.1µF, X7R capacitor. Do not connect the BYP pin to any other external circuitry. INT (Pin 3): Interrupt Output, Open Drain. INT will pull low when any one of several events occur in the LTC4259A-1. It will return to a high impedance state when bits 6 or 7 are set in the Reset PB register (1Ah). The INT signal can be used to generate an interrupt to the host processor, eliminating the need for continuous software polling. Individual INT events can be disabled using the Int Mask register (01h). See Register Functions and Applications Information for more information. The INT pin is only updated between I2C transactions. SCL (Pin 4): Serial Clock Input. High impedance clock input for the I2C serial interface bus. The SCL pin should be connected directly to the I2C SCL bus line. SDAOUT (Pin 5): Serial Data Output, Open Drain Data Output for the I2C Serial Interface Bus. The LTC4259A-1 uses two pins to implement the bidirectional SDA function to simplify optoisolation of the I2C bus. To implement a stan- dard bidirectional SDA pin, tie SDAOUT and SDAIN together. See Applications Information for more information. SDAIN (Pin 6): Serial Data Input. High impedance data input for the I2C serial interface bus. The LTC4259A-1 uses two pins to implement the bidirectional SDA function to sim- plify optoisolation of the I2C bus. To implement a standard bidirectional SDA pin, tie SDAOUT and SDAIN together. See Applications Information for more information. AD3 (Pin 7): Address Bit 3. Tie the address pins high or low to set the I2C serial address to which the LTC4259A-1 responds. This address will be (010A3A2A1A0)b. Pull AD3 high or low with ≤10k or tie to VDD or DGND. AD2 (Pin 8): Address Bit 2. See AD3. AD1 (Pin 9): Address Bit 1. See AD3. AD0 (Pin 10): Address Bit 0. See AD3. DETECT1 (Pin 11): Detect Sense, Port 1. The LTC4259A- 1 Powered Device (PD) detection, classification and AC disconnect hardware monitors port 1 with this pin. Con- nect DETECT1 to the output port via a 0.47 µF 100V X7R capacitor in series with a 1k resistor, both in parallel with a low leakage diode (see Figure 1). The resistor and capacitor may be eliminated if AC disconnect is not used. If the port is unused, the DETECT1 pin can be tied to DGND or allowed to float. DETECT2 (Pin 12): Detection Sense, Port 2. See DETECT1. DETECT3 (Pin 13): Detection Sense, Port 3. See DETECT1. DETECT4 (Pin 14): Detection Sense, Port 4. See DETECT1. DGND (Pin 15): Digital Ground. DGND should be con- nected to the return from the 3.3V supply. DGND and AGND should be tied together. VDD (Pin 16): Logic Power Supply. Connect to a 3.3V power supply relative to DGND. VDD must be bypassed to DGND near the LTC4259A-1 with at least a 0.1 µF capaci- tor. SHDN1 (Pin 17): Shutdown Port 1, Active Low. When pulled low, SHDN1 shuts down port 1, regardless of the state of the internal registers. Pulling SHDN1 low is equivalent to setting the Reset Port 1 bit in the Reset Pushbutton register (1Ah). Internal filtering of the SHDN1 pin prevents glitches less than 1 µs wide from reseting the LTC4259A-1. Pull SHDN1 high with ≤10k or tie to VDD. SHDN2 (Pin 18): Shutdown Port 2, Active Low. See SHDN1. SHDN3 (Pin 19): Shutdown Port 3, Active Low. See SHDN1. SHDN4 (Pin 20): Shutdown Port 4, Active Low. See SHDN1. |
Similar Part No. - LTC4259A-1_15 |
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Similar Description - LTC4259A-1_15 |
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