U2405B Datasheet, PDF (6/17 Pages) TEMIC Semiconductors – Fast Charge Controller for Drained NiCd/NiMH Batteries

U2405B
Start
Power on reset
LED1,2 off
*) 70 mV > V_Batt < 5 V
yes
no
Batt. inserted
*)
Reset
LED1 on
LED2 blinking
no
Temp. range ?
yes _Preformation
current I RB1
no
Temp. range ?
yes
Charge stop
LED1 blinking
Fast charge
begins
LED2 blinking
yes
no
V_Batt > 1.6 V
yes
t_ch>10 min
no
V_Batt ≤ 4 V
yes
–dV
yes
no
switch off
no
yes
Batt. inserted
*)
Charge time
no
t₁>5 min?
LED1 blinking
LED2 off
LED1 off
LED2 blinking
–dV and d²V/dt²
monitoring activated
yes
no
Batt. inserted
*)
Batt temp
yes
no
range?
LED1 on
–dV
no
disconnect
d²V/dt²
no
disconnect ?
LED2 on
LED2 on
Trickle charge
1/256 I_O
Top off charge
1/4 I_O
yes
yes
no
Batt. inserted
no
t₂> 20 min
*)
Figure 4. Flow chart
95 10625
6 (17)
TELEFUNKEN Semiconductors
Rev. A2, 14-Nov-96