UCS3205 datasheet(18/30 Pages) MICROCHIP

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UCS3205

DS20006433A-page 18

 2020 Microchip Technology Inc.

FIGURE 4-4:

Fast Role Swap – Aborted.

4.10

Output Discharge

To perform output discharge, the digital logic sends a

signal to connect the internal current source between

the VOUT pins and ground.

The output discharge can be done only when the

switch is off, so only when the EN pin is low or after a

Fault condition has been detected.

The DSC pin controls the output discharge behavior

according to the Table 4-1.

4.11

Automatic Output Discharge

The VOUT pin is automatically discharged if the DSC

pin is VIH while:

• The EN pin transitions from high-to-low, or

• A Fault condition has been detected.

The automatic output discharge ends when:

• The EN pin transitions from low-to-high, or

• The auto-recovery Fault handling starts, or

• The discharge timer reaches tDISCHARGE, or

• The DSC pin transitions from high-to-low, or

• Overtemperature is detected. Overtemperature

threshold during discharge is +170°C.

4.12

Triggered Output Discharge

To enable the external triggered output discharge, the

DSC pin must be normally connected to ground, but

pulled high temporarily when the output needs to be

discharged.

The output is discharged when the EN pin is pulled low

and the DSC pin is pulled high.

The output discharge ends when:

• The DSC pin transitions from high-to-low, or

• The EN pin transitions from low-to-high, or

• The discharge timer reaches tDISCHARGE, or

• Overtemperature is detected. Overtemperature

threshold during discharge is +170°C.

T = 200 μs

FRS

FRS pulled high to

wake up UCS3205

Milliseconds,

hours or days

elapsed

PD controller detects FRS

request and arms UCS3205

If DIR =

0, BVD is

and will end up in Fault

state.

If DIR =

1, UCS3205 will do a basic start-up as EN = 1

and FRS =

0 (no BVD Fault)

VOUT

VIN

DIR =

1 => Basic Switch On

DIR =

0 => Switch Stays

=> Fault

FRS

aborted

TABLE 4-1:

OUTPUT DISCHARGE

CONFIGURATION

DSC Pin State

Output Discharge Behavior

Always low

The output is never discharged.

Always high

Automatic output discharge.

Temporarily high

when EN is low,

under external

circuit control

External triggered output

discharge.

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