TC9WMB4FU Datasheet, PDF (8/17 Pages) Toshiba Semiconductor – CMOS Digital Integrated Circuits Silicon Monolithic 4096-Bit (512 × 8-Bit) 2-Wire Serial EEPROM

7. Notes on Use
TC9WMB4FU
(1) Powering up the device
This device contains a power-on clear circuit, which initializes the internal circuit of the device
when the power is turned on. After initialization, the address counter returns to the first address 00H
and the SDA pin goes to the high-impedance state (standby state). If initialization fails, the device
may malfunction. When powering up the device, observe the following precautions to assure that the
clear circuit will operate normally:
(a) Pull SCL and SDA high.
(b) The power rising time (t_R) must be 10 ms or less.
(c) After turning off the power, wait at least 100 ms (t_OFF) before attempting to power up the
device again.
(d) The supply voltage must rise from a voltage lower than 0.1 V.
(e) After turning on the power, wait at least 10 ms before attempting to send an instruction to the
device.
V_CC
V_CC
0.1 V max
0V
t_OFF
t_R
10 ms
Figure 10
(2) Pulling up the SDA and SCL pins
The device requires the SDA and SCL pins to be pulled up with an external resistor. The
recommended pull-up resistance range is 1 kΩ to 10 kΩ.
(3) Noise elimination time for the SDA and SCL pins
The device contains a low-pass filter for eliminating noise on the SDA and SCL pins. Its guaranteed
value corresponds to the noise suppression time Ti, given in the AC characteristics table.
(4) Write operation
(a) The address counter is incremented when a write instruction is received successfully. It is
incremented on the falling edge of the SCL pulse where the least significant bit of data is
received.
D1
D0
Increment
Figure 11 Increment Timing Diagram
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2007-10-19