S35390A datasheet(38/51 Pages) SII

38 / 51 page

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK

S-35390A H Series

Rev.2.2_00

Seiko Instruments Inc.



Examples of Application Circuits

VCC

XOUT

XIN

S-35390A H Series

SDA

VSS

VDD

SCL

VSS

VCC

CPU

INT1

System

power supply

10 k

INT2

10 k

Caution

1. Because the I/O pin has no protective diode on the VDD side, the relation of VCC

≥ VDD is possible,

but pay careful attention to the specifications.

2. Start communication under stable condition after power-on the power supply in the system.

Figure 47 Application Circuit 1

VCC

CPU

S-35390A H Series

SDA

VSS

VDD

SCL

INT1

System power

supply

VSS

XOUT

XIN

10 k

INT2

10 k

Caution Start communication under stable condition after power-on the power supply in the system.

Figure 48 Application Circuit 2

Caution

The above connection diagrams do not guarantee operation. Set the constants after performing

sufficient evaluation using the actual application.

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