BR24T16FJ-WSGN(2020) 데이터 시트보기 (PDF) - ROHM Semiconductor

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BR24T16FJ-WSGN
(Rev.:2020)

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

ROHM Semiconductor 

BR24T16-W

Datasheet

Power-Up / Down Conditions

At power ON, the IC’s internal circuits may go through unstable low voltage area as the Vcc rises, making the IC’s internal

logic circuit not completely reset, hence, malfunction may occur. To prevent this, the IC is equipped with POR circuit and

LVCC circuit. To assure the operation, 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

tOFF

Vbot

0

Figure 51. Rise Waveform Diagram

Recommended conditions of tR, tOFF,Vbot

tR

tOFF

Vbot

10ms or below 10ms or larger 0.3V or below

100ms or below 10ms or larger 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.

(1) In the case when the above condition 1 cannot be observed such that SDA becomes 'L' at power ON .

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

V CC

SCL

tLOW

SDA

After Vcc becomes stable

tDH

tSU:DAT

Figure 52. When SCL= 'H' and SDA= 'L'

After Vcc becomes stable

tSU:DAT

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

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

→After power source becomes stable, execute software reset (Page 16).

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

→Carry out (1), and then carry out (2).

Low Voltage Malfunction Prevention Function

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

data rewrite is prevented.

Noise Countermeasures

1. Bypass Capacitor

When noise or surge gets in the power source line, malfunction may occur, therefore, it is recommended to connect a

bypass capacitor (0.1µF) between IC Vcc and GND pins. Connect the capacitor as close to IC as possible. In addition, it is

also recommended to connect a bypass capacitor between board’s Vcc and GND.

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24.Dec.2020 Rev.008

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