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LC87F14C8SA Datasheet(PDF) 11 Page - Sanyo Semicon Device |
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LC87F14C8SA Datasheet(HTML) 11 Page - Sanyo Semicon Device |
11 / 26 page LC87F14C8SA No.A0590-11/26 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 the reference voltage circuit can be switched by option selection. The procedure for marking the option selection is described below. (1) (2) (3) (4) USB Regulator USE USE USE NONUSE USB Regulator in HOLD mode USE NONUSE NONUSE NONUSE Option selection USB Regulator in 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 increases 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 VSS2VSS3 VDD1 VDD2 VDD3 Power Supply 3.3V For backup LSI UHD+ UHD- UFILT 15k Ω To USB connector 33 Ω 5pF 0 Ω 2.2 µF VSS1 VSS2 VSS3 VDD1 VDD2 VDD3 Power Supply 5V For backup LSI UHD+ UHD- UFILT 0 Ω 2.2 µF 15k Ω To USB connector 33 Ω 5pF 2.2 µF 0.1 µF |
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