power ON/OFF, "L". When "H", this gets input accept status (active). p
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Notes power ON/OFF
power ON/OFF, "L". When "H", this gets input accept status (active). power turned this status, noises likes cause malfunction, mistake write prevent these, power "L". (When status, inputs cancelled.) power decline, owing power line capacity forth, power status continue long. this case too, owing same reason, malfunction, mistake write occur, therefore, power too, "L".
example Good example
Fig. Timing power ON/OFF
(Bad example) pulled Vcc. (Good example) power ON/OFF.
10ms higher recharge power OFF. When power turned without observing this condition, internal circuit reset, which please note. this case, becomes (active status), EEPROM have malfunction, mistake write owing noises likes. Even when input High-Z, status becomes like this case, which please note.
circuit
This (Power Reset) circuit mistake write countermeasure. After action, gets write disable status. circuit valid only when power does work when power OFF. However, power ON/OFF, become write enable status owing noises likes. secure actions, observe following conditions. "L". Turn power satisfy recommended conditions tOFF, Vbot circuit action.
Recommended conditions tOFF, Vbot tOFF Vbot tOFF Vbot 10ms below 10ms higher 0.3V below 100ms below 10ms higher 0.2V below
Fig. Rise waveform diagram LVCC circuit
LVCC (Vcc Lockout) circuit prevents data rewrite action power, prevents wrong write. LVCC voltage (Typ. 1.2V) below, prevent data rewrite.
Copyright 2007 ROHM Co., Ltd. rights reserved.
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