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LC87F1JJ4A 数据表(PDF) 11 Page - ON Semiconductor

部件名 LC87F1JJ4A
功能描述  8-bit 1-chip Microcontroller
Download  27 Pages
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

LC87F1JJ4A 数据表(HTML) 11 Page - ON Semiconductor

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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


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