U2400B 查看數據表（PDF） - Temic Semiconductors

零件编号

产品描述 (功能)

生产厂家

U2400B

Charging of Batteries with Automatic Pre-Discharge

Temic Semiconductors 

U2400B

General Description, Figures 2 and 3

The integrated circuit, U2400B, supports specially the

controlled and defined charging of fast NiCd cells.

Varieties of charging time selections, i.e., standard charge

(12 h), quick charge (1 h) or fast charge (0.5 h) are

possible.

* * Before the charging begins, cell is discharged completely.

In this way, the long life Memory Effect of the

recharging cell remains intact. Surveillance is taken over

by control unit for time, thermal and voltage during the

charging and switch-off when the specified capacity is

attained. When switched on, the red LED connected to the

display output (Pin 9) is activated. This is only the case

if no battery is connected. When a battery is inserted with

a minimum voltage of approximately 180 mV at Pin 4,

the pre-discharge phase is then started with a 2 seconds

delay. The discharge output at Pin 10 is activated. This is

indicated by the flashing red LED (see figure 5). The

discharge procedure is stopped with a voltage less than

530 mV (at Pin 6). The following charge phase (charge

output Pin 12 active) is indicated by the flashing green

LED (Pin 9).

After the programmed charging period (Pin 13: 0.5 or 1 h

continuous charge, or 12 h pulsed charge) the trickle

charge phase is reached (figure 4). This trickle charge

mode is indicated by the on-state of the green LED. This

means, the battery has stored the maximum possible

* amount of energy. The outputs display, discharge and

* charge will be set inactive (by temperature, over-

voltage). The timer clock is interrupted during the

inactive phase and in each mode when a limit value

(Pins 4 and 5) is exceeded.

START

Reset

no

Pin 9: “0”

Battery

yes

inserted ?

Pin 9: “open”

Pin 9: Alternating

blinking

yes

Pin 15 = VRef

no

Pin 9: “0”

Trickle charge

Pin 12: “0” pulsed

Pin 10: open

Pin 9: “1”

yes

no

Time

t > tmax ?

yes

no Event counter

Z<2?

V < Vmax ?

no

STAND – BY

Increment

event counter

Pin 12: open

Pin 9: open

Pin 10: open

Timer stop

yes

no

yes

T < Tmax ?

Discharge

Pin12: open

Pin 9: “0” pulsed

Pin 10 “1”

Timer stop

no

yes

“Discharged”

memory set ?

no

Charge

Pin 12: “1” pulsed

Pin 9: “1” pulsed

Pin 10: open

Timer run

Figure 3. Flow chart

V < Vmin ?

yes

Set “discharged”

memory

94 9377

TELEFUNKEN Semiconductors

Rev. A2, 21-Nov-96

3 (15)

Share Link: