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LC87F14C8SA Datenblatt(PDF) 11 Page - Sanyo Semicon Device

Teilenummer LC87F14C8SA
Bauteilbeschribung  FROM 128K byte, RAM 10K byte on-chip 8-bit 1-chip Microcontroller with USB-host controller
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Hersteller  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

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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
To USB connector
33
5pF
0
2.2
µF
VSS1 VSS2 VSS3
VDD1
VDD2
VDD3
Power Supply
5V
For backup
LSI
UHD+
UHD-
UFILT
0
2.2
µF
15k
To USB connector
33
5pF
2.2
µF
0.1
µF


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