ISOUSB211 datasheet(23/40 Pages) TI

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must be connected to ground as shown. Under this condition ISOUSB211 responds to BC 1.2 signaling from a

connected peripheral indicating to the peripheral that the port is capable of supply 1.5-A current on VBUS.

LDO

GND

OUT

V3P3V1

VBUS1

VCC1

UD-

UD+

GND1

V1P8V1

Host/Hub

MCU

DGND

0 V

Digital

Ground

ISO

Ground

ISO

DC-DC

VCC

GND

CLK

Galvanic

Isolation Barrier

ISOUSB211

3.3 VLV

3.3 VLV (local supply)

Downstream

Port

Connector

VCC

VBUS

GND

D-

D+

100 nF

0.1 µF

1 µF

EQ10

GND1

EQ11

V2OK

V1P8V1

CDPENZ1

3.3 VLV

V3P3V2

VBUS2

VCC2

DD-

DD+

GND2

V1P8V2

EQ20

GND2

EQ21

V1OK

V1P8V2

CDPENZ2

0.1 µF

3.3VLV

3.3 VLV

VBUS (5.0 V)

1.8 V

3.3 V

LDO/

DC-DC

Ferrite

Bead

3.3 µF

120 µF

10 nF

0.1 µF

2 µF

10 nF 0.1 µF

2 µF

10 nF

0.1 µF

2 µF

10 nF 0.1 µF 2 µF

Figure 8-1. Isolated Host or Hub with ISOUSB211

8.1.2 Isolated Peripheral - Self-Powered

Figure 8-2 shows an application for isolating a self-powered peripheral using ISOUSB211. In this example,

on the microntroller side, V3P3V2 and VBUS2 are together connected to an external 3.3-V supply. The V1P8V2

supply is generated using the internal 1.8-V LDO by providing 3.3-V supply to VCC1. On the connector side,

the VBUS from the USB connector is connected to VBUS1 and the V3P3V1 supply is generated using the internal

3.3-V LDO. VCC1 and V1P8V1 are connected together connected to an external 1.8-V supply derived from VBUS.

Please refer to Thermal Considerations section to further optimize power dissipation inside ISOUSB211 as

required.Decoupling capacitors are placed next to ISOUSB211 according to the recommendations provided in

the Power Supply Recommendations section. Note that the USB standard requires that, for a peripheral, the

total capacitor value on VBUS must be less than 10-μF. A 100-nF capacitor is recommended close to the VBUS

pin to handle tranisent currents. A ferrite bead (example: BLM18HE152SN1D) may be placed between VBUS

pin of the connector and the VBUS pin of ISOUSB211, as shown in the figure, to suppress transients such as

ESD.

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ISOUSB211

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