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TPS23851DCE Datasheet(PDF) 11 Page - Texas Instruments |
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TPS23851DCE Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 62 page  TPS23851 www.ti.com SLUSAB3 – SEPTEMBER 2010 Detailed Pin Description The following descriptions refer to the pinout and the functional block diagram. RESET: Reset input, active low. When asserted, the TPS23851 will reset, turning off all ports and forcing the registers to their power-up state. This pin is internally pulled up to VDD, with internal 1-µs to 5-µs deglitch filter. External RC network can be used to delay the turn on. There is also an internal power-on reset which is independent of the RESET input. INT: Interrupt output. This pin asserts low when a bit in the interrupt register is asserted. This pin is updated between I2C transactions. This output is open-drain. Interrupt functional diagram is shown in Figure 30. SDAO: Open-drain I2C bus output data line requiring an external resistive pullup. The TPS23851 uses separate SDAO and SDAI lines to allow optoisolated I2C interface. SDAO can be connected to SDAI for non-isolated systems. SCL: Serial clock input for I2C bus. SDAI: Serial data input for I2C bus. This pin can be connected to SDAO for non-isolated systems. Note that the data sent by the TPS23851 on SDAO must be mirrored on its SDAI line for correct operation. See Figure 34. A3-A0: I2C bus address inputs. Can be directly tied to DGND but a resistor (at least 2 k Ω) must be used if pulled up. These pins are internally pulled up to VDD. See the Pin Status Register for more details. SHDN1_A: Port 1 Manual Shutdown Input or Port 1-4 Multiplexed Shutdown, active low. This pin is internally pulled up to VDD, with internal 1-µs to 5-µs deglitch filter. When Multiplexed Shutdown is disabled, pulling low SHDN1_A turns off port 1, regardless of the state of registers except the Multiplexed Shutdown Configuration Register. When Multiplexed Shutdown is Enabled, pulling low SHDN1_A turns off the ports selected in the Multiplexed Shutdown Configuration Register. This turn off action is triggered regardless of the state of registers except the Multiplexed Shutdown Configuration Register. SHDN2-4: Port 2-4 Manual Shutdown Logic Input, active low. These pins are internally pulled up to VDD, with internal 1-µs to 5-µs deglitch filter. When Multiplexed Shutdown is disabled, pulling low SHDNn turns off port n, regardless of the state of registers except the Multiplexed Shutdown Configuration Register. NOTE If the Multiplexed Shutdown function is Enabled, the SHDN2 to SHDN4 inputs must be at logic High. DET1-DET4: Port 1-4 detect sense. Used during AC disconnect detection and powered device discovery. Connect to output port through a 1 k Ω in series with a 0.47 µF, both in parallel with a diode. AC disconnect consists in sensing the load impedance by injecting an AC voltage at DETn pin and measuring the resultant current through the same pin. If the impedance is higher than a defined threshold, the port will automatically be turned off. The DET pin sine wave output voltage typically has a 2.5-V offset above the VEE supply, with a 2 V peak-to-peak amplitude under a no load condition. The TPS23851 uses an innovative 4-point technique in order to provide a reliable PD detection. The discovery is performed by sinking two different current levels via the DETn pin, while the PD voltage is measured from DGND to DET. The 4-point measurement provides the capability to avoid powering a capacitive or legacy load. The resistor and capacitor are not needed if AC disconnect is not used. If the port is not used, the DETn pin can be floated or tied to VEE. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS23851 |
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