AIC1781 Ver la hoja de datos (PDF) - Analog Intergrations

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AIC1781

Battery Charge Controller

Analog Intergrations 

AIC1781

BLOCK DIAGRAM

PEAK

MODE

GND VCC

TMR

SEL3

SEL1

SEL2

ADJ

Peak Voltage

Timer Control

Battery Voltage &

Temperature

Portection Setting

LED‘s Display &

Trickle Pulse Duty

Setting

∆T/∆t Detection

Setting

Battery Temp.

Protection

MODE

Selection

Bandgap

Reference &

Voltage

Regulator

Oscillator

Charge Control

State Machine

Display

Control

Unit

Charge

Control Unit

13-bit

A/D

Battery

Voltage

Protection

Discharge

Control Unit

LED2

LED1

ICON

DIS

DSW

VTS

PIN DESCRIPTIONS

PIN 1: PEAK- Tri-level input, determining the

period of peak voltage timer.

(See 0∆V cut-off section in

application informations.)

PIN 2: VBT- Divided battery voltage input to

sense the battery voltage.

PIN 3: DIS- Push-pull output, used to

control an external transistor to

discharge the battery. DIS is

active high when the AIC1781

enters discharge mode.

PIN 4: VTS- The battery cell temperature is

represented as a voltage input

to the AIC1781 at this pin. The

VBT

PIN 5: VCC-

PIN 6: ADJ-

acceptable voltage range of

VTS pin is 0.29 VCC to 0.72

VCC. The battery temperature

is regarded as too high if the

voltage of VTS pin is lower than

0.29 VCC, and is otherwise

regarded as too low if the

voltage of VTS pin is higher

than 0.72 VCC.

Power supply input at 5V±10%.

For adjusting the slope of ∆T/∆t.

Acceptable voltage range for

this pin is approximately 0.28V

to 3.8V. If voltage higher than

7

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