BR24G04FJ-3A 查看數據表（PDF） - ROHM Semiconductor

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BR24G04FJ-3A

Serial EEPROM series Standard EEPROM I2C BUS EEPROM (2-Wire)

ROHM Semiconductor 

BR24G04-3A

●I/O Equivalence Circuit

○ Input (A2,A1,SCL, WP)

○Input / output (SDA)

Figure 50. Input pin circuit diagram

Figure 51. Input / output pin circuit diagram

●Power-up / Down Conditions

At power on, in IC internal circuit and set, Vcc rises through unstable low voltage area, and IC inside is not completely reset,

and malfunction may occur. To prevent this, functions of POR circuit and LVCC circuit are equipped. To assure the action,

observe the following conditions at power on.

1. Set SDA = 'H' and SCL ='L' or 'H’

2. Start power source so as to satisfy the recommended conditions of tR, tOFF, and Vbot for operating POR circuit.

tR

VCC

Recommended conditions of tR, tOFF,Vbot

tR

tOFF

Vbot

tOFF

Vbot

0

Figure 52. Rise waveform diagram

10ms or below

100ms or below

10ms or larger

10ms or larger

0.3V or below

0.2V or below

3. Set SDA and SCL so as not to become 'Hi-Z'.

When the above conditions 1 and 2 cannot be observed, take the following countermeasures.

a) In the case when the above condition 1 cannot be observed. When SDA becomes 'L' at power on .

→Control SCL and SDA as shown below, to make SCL and SDA, 'H' and 'H'.

VCC

SCL

tLOW

SDA

After Vcc becomes stable

tDH tSU:DAT

Figure 53. When SCL= 'H' and SDA= 'L'

After Vcc becomes stable

tSU:DAT

Figure 54. When SCL='L' and SDA='L'

b) In the case when the above condition 2 cannot be observed.

→After power source becomes stable, execute software reset(P18).

c) In the case when the above conditions 1 and 2 cannot be observed.

→Carry out a), and then carry out b).

●Low Voltage Malfunction Prevention Function

LVCC circuit prevents data rewrite action at low power, and prevents wrong write. At LVCC voltage (Typ. =1.2V) or below, it

prevent data rewrite.

●Noise Countermeasures

○Bypass capacitor

When noise or surge gets in the power source line, malfunction may occur, therefore, for removing these, it is recommended

to attach a by pass capacitor (0.1μF) between IC Vcc and GND. At that moment, attach it as close to IC as possible.

And, it is also recommended to attach a bypass capacitor between board Vcc and GND.

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TSZ02201-0R2R0G100560-1-2

11.Jun.2019 Rev.004

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