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LC87F1JJ4A 数据表(PDF) 11 Page - ON Semiconductor |
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LC87F1JJ4A 数据表(HTML) 11 Page - ON Semiconductor |
11 / 27 page LC87F1JJ4A No.A1454-11/27 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 optional settings. The procedure for marking the optional settings is described below. (1) (2) (3) (4) Option settings USB regulator Use Use Use Nonuse USB regulator in HOLD mode Use Nonuse Nonuse Nonuse USB regulator in HALT mode Use Nonuse Use Nonuse Reference voltage circuit state Normal mode Active Active Active Inactive HOLD mode Active Inactive Inactive Inactive 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. Circuit example 1: When VDD1=VDD2=3.3V • Inactivating the reference voltage circuit (selection (4)). • Connecting VDD3 to VDD1 and VDD2. *1: Needs adjustment on target board. Circuit example 2: When 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 LSI UHD+ UHD- UFILT 15k Ω To USB connector 33 Ω 5pF 0 Ω 2.2 μF 2.2 μF *1 VSS1 VSS2 VSS3 VDD1 VDD2 VDD3 Power supply 5V LSI UHD+ UHD- UFILT 0 Ω 2.2 μF 15k Ω To USB connector 33 Ω 5pF 2.2 μF 0.1 μF |
类似零件编号 - LC87F1JJ4A |
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类似说明 - LC87F1JJ4A |
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