User Guide

Table 20 Charging IF electrical characteristics
Description Parameter Min Max Unit Notes
Vchar V Charge 0 9 V Center pin
Vchar I Charge 0.85 A Center pin
Charge GND 0.85 A
Threshold for
charging, rising
(TAHVO)
V
MSTR+
2.1 V Typical value
Threshold for
charging,
falling (TAHVO)
V
MSTR-
1.9 V Typical value
Battery connector and interface connections & electrical characteristics
Figure 119 Battery connector
Table 21 Battery interface connections
Pin Signal I/O Engine connection Notes
1 VBAT -> Retu VBAT Battery voltage
2 BSI -> Retu BSI Battery size
indication
(fixed resistor
inside the
battery pack)
3 GND GND Ground
Table 22 Battery IF electrical characteristics
Description Parameter Max Unit
Operation voltage V
IN
4.23 VDC
Current rating I
IN
0.9 A
Internal interfaces
Name of Connection Connector reference Notes
Fold unit connector X4400
RM-42
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