BR24L01 Rohm, BR24L01 Datasheet - Page 17

• Manufacturer Part Number: BR24L01
• Description: 1288 bit electrically erasable PROM
• Manufacturer: Rohm

Memory ICs
5) Notes for power supply
V
may not work properly due to an incomplete reset of internal circuit.
To prevent this, the device has the feature of P.O.R. and LV
In the case of power up, keep the following conditions to ensure functions of P.O.R and LV
(1) It is necessary to be “SDA=H” and “SCL=’L’ or ‘H’ ”.
(2) Follow the recommended conditions of t
(3) Prevent SDA and SCL from being “Hi-Z”.
CC
A) Unable to keep condition 1. (SDA is “LOW” during power up.)
In case that condition 1. and / or 2. cannot be met, take following actions.
B) Unable to keep condition 2.
C) Unable to keep condition 1 and 2.
rises through the low voltage region in which internal circuit of IC and the controller are unstable, so that device
Control SDA, SCL to be “HIGH” as figure below.
After power becomes stable, execute software reset. (See page14 )
Follow the instruction A first, then the instruction B.
After V
V
SCL
SDA
CC
V
CC
CC
0
becomes stable
a) SCL "H" and SDA "L"
BR24L01A-W / BR24L01AF-W / BR24L01AFJ-W /
V
CC
rising wave from
t
DH
t
OFF
t
LOW
R
, t
t
SU:DAT
OFF
, Vbot for the function of P.O.R. durning power up.
t
R
BR24L01AFV-W / BR24L01AFVM-W
Vbot
CC
.
After V
Recommended conditions of t
CC
Below 100ms
Below 10ms
becomes stable
t
R
b) SCL "L" and SDA "L"
Above 10ms
Above 10ms
t
OFF
R
CC
, t
t
SU:DAT
OFF
Below 0.3V
Below 0.2V
.
, Vbot
Vbot
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