S24CS0 datasheet(22/37 Pages) ABLIC

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FOR AUTOMOTIVE 105

°C OPERATION 2-WIRE SERIAL E

2PROM

S-24CS01A/02A/04A H Series

Rev.3.1_03

4. Acknowledge check

The I

2C-bus protocol includes an acknowledge check function as a handshake function to prevent a communication

error. This function allows detection of a communication failure during data communication between the

microprocessor and S-24CS01A/02A/04A. This function is effective to prevent malfunction, so it is recommended to

perform an acknowledge check on the microprocessor side.

5. Built-in power-on-clear circuit

S-24CS01A/02A/04A has a built-in power-on-clear circuit that initializes the S-24CS01A/02A/04A. Unsuccessful

initialization may cause a malfunction. For the power-on-clear circuit to operate normally, the following conditions

must be satisfied for raising the power supply voltage.

5. 1 Raising power supply voltage

Raise the power supply voltage, starting at 0.2 V maximum, so that the voltage reaches the power supply voltage to

be used within the time defined by tRISE as shown in Figure 26.

For example, when the power supply voltage to be used is 5.0 V, tRISE is 200 ms as shown in Figure 27. The power

supply voltage must be raised within 200 ms.

0.2 V

VINIT (Max.)

tINIT

*2 (Max.)

tRISE (Max.)

Power supply voltage (VCC)

0 V

*1.

0 V means there is no difference in potential between the VCC pin and the GND pin

of the S-24CS01A/02A/04A.

*2. tINIT is the time required to initialize the S-24CS01A/02A/04A. No instructions are

accepted during this time.

Figure 26 Raising Power Supply Voltage

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