S-35390A Datasheet, PDF (37/54 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

Rev.2.4_00
„ Examples of Application Circuits
10 kΩ
VDD
VSS
S-35390A
INT1
INT2
SDA
SCL
10 kΩ
XIN XOUT
C_g
2-WIRE REAL-TIME CLOCK
S-35390A
V_CC
VCC
System
power supply
CPU
VSS
Caution 1. Because the I/O pin has no protective diode on the VDD side, the relation of V_CC ≥ V_DD 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
VDD
INT1
INT2
S-35390A
VSS
SDA
SCL
XIN XOUT
10 kΩ
10 kΩ
VCC
CPU
VSS
System power
supply
C_g
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.
Seiko Instruments Inc.
37