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USB1T1102RMHX Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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USB1T1102RMHX Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 14 page www.fairchildsemi.com 4 Power Supply Configurations and Options The two modes of power supply operation are: • Normal Mode: VCCIO and VCC (5V) are connected or VCCIO, VCC (5V) and [VREG (3.3V) and VCC (5V) shorted for Bypass mode] 1. For 5V operation VCC is connected to 5V source (4.0V to 5.5V) and the internal voltage regulator then produces 3.3V for the USB connections. 2. For 3.3V operation both VCC and VREG are con- nected to a 3.3V source (3.0V to 3.6V) In both cases for normal mode the VCCIO is an indepen- dent voltage source (1.65V to 3.6V) that is a function of the external circuit configuration. • Sharing Mode: VCCIO is only supply connected. VCC and VREG are not connected. In this mode the D+ and D− pins are 3-STATE and the USB1T1102 allows external signals up to 3.6V to share the D + and D− bus lines. Internally the circuitry limits leakage from D + and D− pins (maximum 10 µA) and V CCIO such that device is in low power (suspended) state. Pins Vbusmon and RCV are forced LOW as an indication of this mode with Vbus- mon being ignored during this state. A summary of the Supply Configurations is described in Table 4. TABLE 4. Power Supply Configuration Options Pins Power Supply Mode Configuration Sharing Normal (Regulated Output) Normal (Regulator Bypass) VCC (5V) Not Connected Connected to 5V Source Connected to VREG (3.3V) [Max Drop of 0.3V] (2.7V to 3.6V) VREG (3.3V) Not Connected 3.3V, 300 µA Regulated Output Connected to 3.3V Source VCCIO 1.65V to 3.6V Source 1.65V to 3.6V Source 1.65V to 3.6V Source VPU (3.3V) 3-STATE (Off) 3.3V Available if Config = HIGH 3.3V Available if Config = HIGH D +, D− 3-STATE Function of Mode Set Up Function of Mode Set Up Vp/Vpo, Vm/Vmo L Function of Mode Set Up Function of Mode Set Up RCV L Function of Mode Set Up Function of Mode Set Up Vbusmon L Function of Mode Set Up Function of Mode Set Up OE, SUSPND, Config Hi-Z Function of Mode Set Up Function of Mode Set Up |
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