Epson RX8111CE - Chargeable Current Characteristics; Reference Value of Switching Element

RX8111CE
Page − 9
ETM61E-01
9.1.2. Chargeable Current Characteristics
Chargeable current characteristics to Battery. It is ON resistance of SW1, 2, 3.
The reference value of +25 C Typ. samples.
Y axis = Charge current Ichg, X axis = Vdef = (V
DD
– V
BAT
).
Figure 10 Chargeable current characteristics of V
BAT
V
DD
= 3.0 V
Figure 11 Chargeable current characteristics of V
BAT
V
DD
= 5.5V
Figure 12 Circuit of charge to re-chargeable Battery.
9.1.3.Reference Value Of Switching Element.
Table 6 Reference value of switching element
Item
Characteristics
Condition
Current tolerance
40 mA Max.
SW1 = SW2 = SW3 = ON,
+25 C
Diode Vf
0.60 V / 1 mA Typ.
0.85 V / 10 mA Typ.
V
DD
= 3.0 V, +25 C
Diode IR
50 nA Max.
VR = 5.5 V, -40 C to +85 C
Charge current from V
BAT
must be use less than 40 mA.
Re-chargeable
Battery
V
OUT
V
DD
V
BAT
SW3
SW2
SW1
RTC Power Supply
Main
Power
Supply
A