S-7760A51XX-TCT1G datasheet(30/53 Pages) SII

Part #	S-7760A51XX-TCT1G

Description	PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

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Manufacturer	SII [Seiko Instruments Inc]

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PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

S-7760A

Rev.1.3_00

Seiko Instruments Inc.

30

3. Acknowledgment check

The I

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

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

the master device and the S-7760A.

4. Built-in power-on-clear circuit

The S-7760A has a built-in power-on-clear circuit that initializes itself at the same time during power-on. Unsuccessful

initialization may cause a malfunction. To operate the power-on-clear circuit normally, the following conditions must be

satisfied to raise the power supply voltage.

4. 1 Raising power supply voltage

As shown in Figure 33, raise the power supply voltage from 0.2 V max., within the time defined as tRISE which is the

time required to reach the power supply voltage to be set.

For example, if the power supply voltage is 3.0 V, tRISE = 100 ms as seen in Figure 34. The power supply voltage

must be raised within 100 ms.

0.2 V

VINIT (Max.)

tINIT

*2 (Max.)

tRISE (Max.)

Power supply voltage (VCCH)

0 V

*1

*1.

0 V means there is no difference in potential between the VCCH pin and the VSS

pin of the S-7760A.

*2.

tINIT is the time required to initialize the S-7760A. No instructions are accepted

during this time.

Figure 33 Raising Power Supply Voltage

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S-7760A51XX-TCT1G Datasheet(PDF) 30 Page - Seiko Instruments Inc

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