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TPS2231PWPR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS2231PWPR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 26 page www.ti.com SYSRST OC FUNCTIONAL TRUTH TABLES Truth Table for Voltage Outputs Truth Table for Logic Outputs TPS2231 TPS2236 SLVS536B – JULY 2004 – REVISED JANUARY 2005 Detailed Pin Descriptions (continued) This input is driven by the host system and directly affects PERST. Asserting SYSRST (logic low) forces PERST to assert. RCLKEN is not affected by the assertion of SYSRST. SYSRST has an internal pullup connected to AUXIN. This pin is an open-drain output. When any of the three power switches (AUX, 3.3V, and 1.5V) is in an overcurrent condition, OC is asserted (logic low) by an internal discharge FET with a deglitch delay. Otherwise, the discharge FET is open, and the pin can be pulled up to a power supply through an external resistor. VOLTAGE INPUTS(1) LOGIC INPUTS VOLTAGE OUTPUTS(2) MODE(3) AUXIN 3.3VIN 1.5VIN SHDN STBY CP (4) AUXOUT 3.3VOUT 1.5VOUT Off x x x x x Off Off Off OFF On x x 0 x x GND GND GND Shutdown On x x 1 x 1 GND GND GND No Card On On On 1 0 0 On Off Off Standby On On On 1 1 0 On On On Card Inserted (1) For input voltages, On means the respective input voltage is higher than its turnon threshold voltage; otherwise, the voltage is Off (for AUX input,Off means the voltage is close to zero volt). (2) For output voltages, On means the respective power switch is turned on so the input voltage is connected to the output; Off means the power switch and its output discharge FET are both off; GND means the power switch is off but the output discharge FET is on so the voltage on the output is pulled down to 0 V. (3) Mode assigns each set of input conditions and respective output voltage results to a different name. These modes are referred to as input conditions in the following Truth Table for Logic Outputs. (4) CP = CPUSB and CPPE– equal to 1 when both CPUSB and CPPE signals are logic high, or equal to 0 when either CPUSB or CPPE is low. INPUT CONDITIONS LOGIC OUTPUTS MODE SYSRST RCLKEN(1) PERST RCLKEN(2) OFF Shutdown X X 0 0 No Card Standby 0 Hi-Z 0 1 0 0 0 0 Card Inserted 1 Hi-Z 1 1 1 0 0 0 (1) RCLKEN as a logic input in this column. RCLKEN is an I/O pin and it can be driven low externally, left open, or connected to high-impedance terminals, such as the gate of a MOSFET. It must not be driven high externally. (2) RCLKEN as a logic output in this column. 11 |
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