Product Specs

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Subject: Doc. No.: Rev: 0.6
UMC-STD31BPN Product Specification Page 46 of 55
本資料為啟碁科技股份有限公司專有之財產，非經書面許可，不准透露或使用本資料，亦不准複印，複製或轉變成其他形式使用。
The information contained herein is the exclusive property of WNC and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission from WNC.
Form No.: 2-JT-00022-03_001
UMC-STD31BPN Product Specification
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8.10 KPCOL0
Pull KPCOL0 LOW to force NAD being USB Download Mode for user updating NAD software
8.11 IDDIG
This pin is used as USB 2.0 OTG ID pin
8.12 WATCHDOG
WATCHDOG is a 1.8V level signal generated from MT2731 and then received by PMIC. In normal cases,
MT2731 keeps WATCHDOG as the high state; in case of the low state event happened, a NAD resetting
reaction steps would be performed between MT2731 and PMIC and defined as below
(1) If MT2731 is malfunctioning, WATCHDOG would become the low state, as well as WDTRSTB_IN of
PMIC. Then, PMIC starts itself reset
(2) After the reset of PMIC is finished, PMIC sent RESETB of the low state to SYSRSTB of MT2731. Then,
MT2731 also starts itself reset procedure