FUSB3307

www.onsemi.com

19

NTC

CATH

Analog to Digital

Converter

OVP/UVP/

OCP

V CS−AMP V COMR

Protection

vdd

FAULT

Internal temp.

Protection

Block

VCC

9R

R

Figure 14. Protection Section of Block Diagram for UVP, OVP, OCP, and OTP Faults

This NTC measured temperature is useful for dynamic

monitoring by the Sink via FUSB3307 provided PD Status

messages which contains this NTC temperature in this

package option. If this temperature exceeds a warning

threshold (100

°C for a NTC resistor of 100 kW ± 1%, B25/50

= 4300K

± 1% to ground in parallel with a 20 kW ± 1% to

message is sent to the Sink indicating this temperature

warning. If however, the E_OTP threshold is exceeded

(110

°C for a NTC resistor of 100 kW ± 1%, B25/50 = 4300K

± 1% to ground in parallel with a 20 kW ± 1% to ground) for

as described in the Protection Operation section above.

Upon re−establishing an explicit contract with the Sink, the

FUSB3307 sends an Alert to let the Sink know it previously

experienced an Over Temperature Protection event.

The SOIC package version of the FUSB3307 doesn’t have

an NTC pin and so the internal die temperature is monitored.

the Sink indicating this temperature warning. If however, the

time, then an I_OTP fault is triggered and executing

protection as described in Protection Operation section

above. The FUSB3307 sends an Alert to let the Sink know

it previously experienced an Over Temperature Protection

event. This internal die temperature is monitored also in the

QFN package option and either an E_OTP fault (based off

the NTC pin voltage) or an I_OTP fault causes the

FUSB3307 to disconnect and shut off VBUS. The

temperature warning for the QFN package is only triggered

via the NTC resistor not the internal die temperature.

CC1 and CC2 Over Voltage Protection (CC_OVP)

FUSB3307 protects against the CC1 and CC2 connector

pins being shorted to VBUS up to 26 V and it has the ability

to start protecting the system when the CC voltage is beyond

it normal operating range. If the CC voltage is above

the FUSB3307 protects the system by triggering this fault

and executing protection as described in Protection

Operation section above.

VCONN Over Current Protection (VCONN_OCP)

FUSB3307 will turn on VCONN whenever it needs to

read the eMarker in the cable only if 5 A capability is chosen

from the trim table (Table 6) above and this design has a

Type C connector and not a hardwired captive cable. When

VCONN is sourced, per USB PD specification only

100 mW maximum (5 V with 20 mA for the FUSB3307)

needs to be supplied for a USB 2.0 source application. If the

supply and abort the eMarker discovery process. The default

maximum current of 3 A will be used for all source

capabilities for USB PD messages in the latter case and the

normal PD messaging will occurs without interruption. No

Alert messages will be sent but the PD Status message will

have a bit to indicate that the cable limited the FUSB3307

from advertising 5 A source capabilities.

Specifications References

revision 3.0 version 2.0 + ECNs up to 07 February, 2020

Specification release 2.0, dated August, 2019

dated December 7, 2010

revision 2.0 version 1.3, dated 12 January, 2017