U2402B Datasheet, PDF (11/17 Pages) TEMIC Semiconductors – Fast Charge Controller for NiCd/NiMH Batteries

U2402B
Status Control
Status control inside and outside the charging process are designated by LED₁ and LED₂ outputs given in the table
below:
LED1 (red)
OFF
OFF
ON
Blinking
LED2 (green)
Status
ON
No battery, top off charge, trickle charge
Blinking Quick charge, temperature out of the window before battery insertion or power on
OFF
Temperature out of the window
OFF
Battery break (interrupt) or short circuit
+ ^{The blink frequency of LED outputs can be calculated as}
follows:
f_(LED)
Oscillator frequency, f_osc
1024
Oscillator
Time sequences regarding measured values and
evaluation are determined by the system oscillator. All
the technical data given in the description are with the
standard frequency 800 Hz.
It is possibe to alter the frequency range in a certain
limitation. Figure 9 shows the frequency versus
resistance curves with different capacitance values.
Oscillation Frequency Adjustment
Recommendations:
0.5C charge
0.5 500 Hz = 250 Hz
1C charge
500 Hz
2C charge
2 500 Hz = 1000 Hz
3C charge
3 500 Hz = 1500 Hz
10000
1000
C_O=2.2nF
C_O=10nF
100
C_O=4.7nF
10
0.1
95 11408
1
10
f_O ( kHz )
Figure 9. Frequency versus resistance for different capacitance values
TELEFUNKEN Semiconductors
Rev. A3, 14-Nov-96
11 (17)