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© 2021 ROHM Co., Ltd.
No. 64UG054E Rev.001
2021.10
User’s Guide
BD93F10MWV-EVK-001 (Stand-Alone)
Over temperature protection by an external PTC thermistor
This EVK has over temperature protection using thermistor RTHD mounted on the board. The detection threshold of the protection
is set to 120°C, and when the temperature around the PTC thermistor reaches the set temperature, the device turns off the Nch-
MOS FET (Q20 and Q21) on VBUS power line to isolate VBUS from the system safely. To enable this protection, connect JP_OTP
EN and ADSIN with a jumper pin.
Other than the temperature detected at RTHD, the overtemperature protection can be triggered by the specific applied voltage as
defined in Table 4.
Table 4. The parameters of the OTP with PTC thermistor
Items
Detection temperature [°C]
120
Implemented PTC thermistor
as RTHU
MURATA PRF15BD102QB6RC
ON Threshold [V]
0.780
OFF Threshold [V]
0.470
Divided resistance RTHU [Ω]
22k
14
t
°
RTHU
RTHD
JP_OTP
ADCIN
SGND
EN
ADCIN
ADCVREF
SGND
SGND
Figure 11. OTP Schematic Circuit
