TC9WMB1FK,TC9WMB2FK

2002-07-31

8

7. Notes on Use

(1)

Powering up the chip

This IC contains a power-on clear circuit, which initializes the internal circuit of the IC when the

power is turned on. If initialization fails, the chip may malfunction. When powering up the chip,

observe the following precautions to assure that the clear circuit will operate normally:

(a) Pull SCL and SDA high.

(b) The power rising time (tR) must be 10 ms or less.

(c) After turning off the power, wait at least 100 ms (tOFF) before attempting to power up the chip

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

chip.

(2)

Pulling up the SDA and SCL pins

This IC requires the SDA and SCL pins to be pulled up with an external resistor. The recommended

pull-up resistance range is 1 kW to 10 kW.

(3)

Noise elimination time for the SDA and SCL pins

This IC 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.

0 V

10 ms

0.1 V max

Figure 10