ISOUSB211 datasheet(21/40 Pages) TI

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7.3.12 HS Test Mode Support

USB2.0 standards needs test mode support, where the host/hub or peripheral is expected to enter High Speed

test-modes based on commands received. ISOUSB211 is able to automatically detect test mode entry to enable

HS compliance tests.

7.3.13 CDP Advertising

The ISOUSB211 device supports CDP advertising on both downstream and upstream facing side according to

Battery Charger standard BC 1.2. CDP advertizing is useful when isolating a host or hub, to indicate to the

connected peripheral that the port is capable of supplying 1.5 A of current on VBUS. CDP advertising can be

enabled by connecting the dowsnstream side CDPENZx pin to ground (active low).

7.4 Device Functional Modes

Function Table lists the functional modes for the ISOUSB211 device.

Table 7-1. Function Table

SIDE 1

SUPPLY

VBUS1, V3P3V1

VCC1, V1P8V1 (1)

BUS1

(UD+, UD-)

SIDE 2

SUPPLY

VBUS2, V3P3V2

VCC2, V1P8V2

BUS2

(DD+, DD-)

COMMENTS

Powered

Active

Powered

Active

When both sides are powered, the state-of the bus is reflected

correctly from upstream to downstream and vice-versa.

Powered

15-kΩ PD

Powered

15-kΩ PD

Disconnected state is presented on both upstream and downstream

Powered

15-kΩ PD

Unpowered

If a side is not powered, the bus lines on that side are in high-

impedance state.

Unpowered

Powered

15-kΩ PD

Unpowered

Undetermined

(1)

Powered =( (VBUSx ≥ UV+(VBUSx)) || (VBUSx = V3P3Vx ≥ UV+(V3P3Vx)) ) & ( (VCCx ≥ UV+(VCCx)) || (VCCx = V1P8Vx ≥ UV+(V1P8Vx)) ) ;

Unpowered = ( (VBUSx < UV-(VBUSx)) & (V3P3Vx < UV-(V3P3Vx)) ) || ( (VCCx < UV-(VCCx)) & (V1P8Vx < UV-(V1P8Vx)) ); X = Irrelevant; H = High

level; L = Low level; Z = High impedance

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ISOUSB211

SLLSFC5 – NOVEMBER 2021

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