TC9WMB1AFK/FU,TC9WMB2AFK/FU

2007-10-19

8

7. Notes on Use

(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”.

device again.

(d) The supply voltage must rise from ∼− 0 V.

(e) After turning on the power, wait at least 10 ms before attempting to send an instruction to the

device.

(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 k

Ω 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.

Figure 10

0 V

10 ms

∼− 0 V

Increment

D1

D0

Figure 11 Increment Timing Diagram