U2402B Datasheet, PDF (6/17 Pages) TEMIC Semiconductors – Fast Charge Controller for NiCd/NiMH Batteries

U2402B
Start
turn on
Power on reset
Charge stop
LED1 blinking
LED2 on
Cell insertion
no
Cell in
permissible
no
yes
temperature
range ?
Cell
yes
inserted ?
*)
Cell insertion reset
LED1 on
LED2 off
Cell in
no
permissible
temperature
range ?
yes
V_Batt
v4V
no
yes
Charging starts with
- dV monitoring
LED2 blinking
– dV
no
switch off
yes
no
Cell
yes
inserted ?
*)
*) 70 mV > V_Batt < 5 V
yes
– dV and d² V/dt²
monitoring begins
yes
Cell in
permissible
yes
temperature
range ?
no
Charging
time reaches
no
5 min. ?
no
Cell
inserted ?
*)
93 7696 e
LED1 on
– dV
no
disconnect ?
yes
LED2 on
Trickle charging
with 1/256 I_O
yes
Cell
inserted ?
*)
no
Figure 4. Flow chart
d² V/dt²
disconnect ? no
yes
LED2 on
Top-off charging
with 1/4 I_O
yes
Timer 20 min exceeded
6 (17)
TELEFUNKEN Semiconductors
Rev. A3, 14-Nov-96