BU9873 Datasheet, PDF (7/40 Pages) Rohm – I2C BUS Serial Interface RTC with High-precision Oscillation Adjustment

BU9873
Typical Performance Curves
0.8
0.6
0.4
0.2
0
0
1
2
3
4
5
6
Supply Voltage V_DD [V]
Figure 7. Timekeeping Current vs. Supply Voltage
(with no 32-kHz clock output, output pins open)
(C_GOUT=C_DOUT=0pF, Topt=25°C)
Datasheet
1.2
1
0.8
0.6
0.4
0.2
0
-60 -30 0 30 60 90 120
Operation Te mperature Topt [Celsius]
Figure 8. Timekeeping Current vs. Operating Temperature
(with no 32-kHz clock output, output pins open)
(C_GOUT=C_DOUT=0pF, V_DD=3V)
4
40
V_DD=1.5V
V_DD=3.0V
3
30
V_DD=5.8V
2
20
1
10
0
0
1
2
3
4
5
6
Supply Voltage V_DD [V]
Figure 9. Timekeeping Current vs. Supply Voltage
(with 32-kHz clock output, output pins open)
(C_GOUT=C_DOUT=0pF, Topt=25°C)
0
0
100
200
300
400
SCL Clock Frequency [kHz]
Figure 10. CPU Access Current vs. SCL Clock Frequency
(with no 32-kHz clock output, SDA=“H”)
(other pins open, C_GOUT=C_DOUT=0pF, Topt=25°C)
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13.Sep.2013 REV.001