AIC1781 データシートの表示（PDF） - Analog Intergrations

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コンポーネント説明

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AIC1781

Battery Charge Controller

Analog Intergrations 

AIC1781

temperature is either too low or too high,

same as abnormal battery voltage. Latch for

charge-suspending function is provided for

high temperature protection, but not for low

temperature protection.

(b)

VCC

-

1.4V>

SEL3

>

Vcc

2

- 0.4V

Acceptable VBT Range:

Before initial timer: 0.16V~2.7V

After initial timer: 0.69V~2.7V

Temperature Protection Mode:

If temperature is too high, battery charging is

regarded as completed. If temperature is too low,

function of ∆T/∆t detection is disabled, just as

thermistor is not existing.

(c) Vcc - 0.4V>SEL3 >1.4V

2

Acceptable VBT Range:

Before initial timer: 0.16V~2V

After initial timer: 1.2V~2V

Temperature Protection Mode:

Entering charge-suspending mode when

temperature is either too low or too high, same

as abnormal battery voltage. Latch for charge-

suspending function is provided for high

temperature protection, but not for low

temperature protection.

(d) 0.3V> SEL3

Acceptable VBT Range:

Before initial timer: 0.16V~2V

After initial timer: 1.2V~2V

Temperature Protection Mode:

If temperature is too high, battery charging is

regarded as completed. If temperature is too low,

function of ∆T/∆t detection is disabled, just as

thermistor is not existing.

Setting the Period of Safety Timer

The AIC1781 provides a method for linearly

adjusting the period of safety timer with an external

resistor connected from TMR pin to GND. The

relation between safety timer length and the

external resistor (RTMR) is shown in Fig. 5. The

table following shows the resistor values for some

of the commonly chosen safety timer periods. Also

shown in the table are their corresponding oscillator

frequencies.

800

600

400

200

0

0

100

200

300

400

500

Safety Timer (min.)

Fig. 5 Safety Timer vs RTMR

RTMR (KΩ)

11

23

48

74

100

152

206

314

491

667

OSC.

Freq.(KHz)

262.4

131.2

65.6

43.7

32.8

21.9

16.4

10.9

7.3

5.5

Safety timer

(min.)

10

20

40

60

80

120

160

240

360

480

Selecting Mode of Operation

The AIC1781 provides three modes of operation:

normal, test, and AC mode determined by the

setting of MODE pin according to TABLE 5. The

AIC1781 will operate normally when the MODE pin

is left floating (a 0.1µF capacitor is recommended

14

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