Rohm BD93F10MWV, Примечание к применению

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Application Note BD93F10MWV Function Description
© 2021 ROHM Co., Ltd. No. 64AN078E Rev.002
Nov.2021
thermistor RTHD around the Nch-MOS FET switch on the
VBUS power rail, which is controlled by the product. There
shall be an external pullup resistor between ADCIN and
ADCVREF. The error of ±1% can be acceptable for the
RTHU resistance.
The OTP is enabled in either Active (Type-C) or Active (USB
PD) state, and by comparing with the varying voltage via
PTC thermistor, the OTP detects under the over-temperature
condition when the voltage at ADCIN is equal or over 0.75V.
The over-temperature condition is released when the voltage
goes equal to or below 0.65V.
Depending on the noise situation on the actual application,
the voltage may not be detected correctly by GND noise.
In this case, it is recommended that the capacitor (CADIN) is
implemented to stabilize the monitoring voltage of the PTC
thermistor.
ADCVREF
5
14
ADCIN
RTHU
22k
Ω
t
°
C
VAD
1
.0
μ
F
Heat
Source
C
AD
IN
RTHD
Figure 7. Over Temperature Detecting
Built-in Over Temperature Protection
Function in this product
This product has the built-in over-temperature protection
function for itself (TSD function : Thermal Shut Down).
The product enters shutdown status forcibly when the die
temperature goes over 175
°
C. The shutdown status is
released if the die temperature is less than 135
°
C after
detecting over temperature.
Over Voltage Protection Function for CCs.
This product provides overvoltage protection to both CC1
and CC2 terminals. When the function detects overvoltage,
the Nch-MOS switch on the VBUS power line is turned off to
isolate the system from Type-C receptacle safely. Please see
Table 9 for more details regarding the behavior after the
detection, the release voltage, or something.
HOST IF Function
It is the premise for this product to operate in Stand-Alone
mode, the function is not available. Therefore, both SCL0
and SDA0 shall short to VDDIO, and GPIO2 shall be open,
and IDSEL shall short to GND.
Internal reference power LDO15 / LDO38
Both LDO15 and LDO38 are internal power reference.
Therefore, no application can utilize these outputs.
Reset by the system
This product is always reset by power-on reset with either
VSVR or VB terminals. Therefore, no reset is required by
triggering XRST terminal in the system. The XRST terminal
shall be short to GND via the capacitance, which specify in
Figure 17.
Supplying the power to VCONN
In premise, this product is for Sink in Stand-Alone operation.
Therefore, it is NOT required for the VCONNIN terminal to be
supplied by power from the external power lanes for
powering an active cable by VCONN. The VCONNIN shall be
short to GND directly, which specify in
Figure 17
.
ATST1 / ATST2 Terminals
These terminals are utilized for the shipment tests or
validations. The actual operation requires no function for
these terminals, therefore these shall be implemented
according to
Figure 17
.
Regarding EXP-PAD
EXP-PAD has no connection to internal GND. It is acceptable
for the application to be connected or not connected.