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LC87F1A32A Datasheet(PDF) 11 Page - Sanyo Semicon Device |
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LC87F1A32A Datasheet(HTML) 11 Page - Sanyo Semicon Device |
11 / 26 page LC87F1A32A No.A0704-11/26 USB Reference Power Option When a voltage 4.5 to 5.5V is supplied to VDD1 and the internal USB reference voltage circuit is activated, the reference voltage for USB port output is generated. The active/inactive state of reference voltage circuit can be switched by the option select. The procedure for marking the option selection is described below. (1) (2) (3) (4) USB Regulator USE USE USE NONUSE USB Regulator at HOLD mode USE NONUSE NONUSE NONUSE Option select USB Regulator at HALT mode USE NONUSE USE NONUSE Normal state active active active inactive HOLD mode active inactive inactive inactive Reference voltage circuit state HALT mode active inactive active inactive • When the USB reference voltage circuit is made inactive, the level of the reference voltage for USB port output is equal to VDD1. • Selection (2) or (3) can be used to set the reference voltage circuit inactive in HOLD or HALT mode. • When the reference voltage circuit is activated, the current drain increase by approximately 100μA compared with when the reference voltage circuit is inactive. Example 1: VDD1=VDD2=3.3V • Inactivating the reference voltage circuit (selection (4)). • Connecting VDD3 to VDD1 and VDD2. Example 2: VDD1=VDD2=5.0V • Activating the reference voltage circuit (selection (1)). • Isolating VDD3 from VDD1 and VDD2, and connecting capacitor between VDD3 and VSS. VSS1 VSS2 VSS3 VDD1 VDD2 VDD3 Power supply 3.3V For backup LSI D+ D- UFILT To USB connector 27 to 33 Ω 5pF 0 Ω 2.2 μF 1.5k Ω P70 VSS1 VSS2 VSS3 VDD1 VDD2 VDD3 Power supply 5V For backup LSI D+ D- UFILT 0 Ω 2.2 μF To USB connector 27 to 33 Ω 5pF 1.5k Ω P70 2.2 μF 0.1µF |
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