AAT3682 データシートの表示（PDF） - Advanced Analogic Technologies

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AAT3682

Lithium-Ion/Polymer Battery Charger

Advanced Analogic Technologies 

AAT3682

Lithium-Ion/Polymer Linear Battery Charger

High-Speed Data Reporting

An optional system microcontroller interface can be

enabled by pulling the T2X pin up to 4.5V to 5.5V

during the power-up sequence. The T2X pin should

be pulled high with the use of a 100kΩ resistor. If

the input supply to VIN will not exceed 5.5V, then

the T2X pin may be tied directly to VIN through a

100kΩ resistor. Since this is a TTL level circuit, it

may not be pulled higher than 5.5V without risk of

damage to the device.

When the high-speed data report feature is

enabled, the STAT output periods are sped up to

40µs, making the total status word 160µs in length.

See Figure 4 below.

An additional feature is the Output Status for the

Battery Not Detected state. When the AAT3682

senses there is no battery connected to the BAT

pin, the STAT pin cycles for two periods, then

remains off for two periods. When in high-speed

data reporting, the AAT3682 will only trickle charge

at the 2X trickle charge level. This is because the

T2X pin is pulled high to enable the high-speed

data reporting. A status display LED may not be

connected to the STAT pin when the high-speed

data reporting is being utilized. If both display

modes are required, the display LED must be

switched out of the circuit before the T2X pin is

pulled high. Failing to do so could cause problems

with the high-speed switching control circuits inter-

nal to the AAT3682.

Charge Complete LED Status Mode

A simplified LED status can be obtained by config-

uring the AAT3682 for high-speed data reporting

mode (T2X tied to VCC) and installing a 0.047µF

capacitor from the STAT pin to the VSS pin (see

Figure 5). In this configuration, the LED will be illu-

minated for all modes except the Sleep/Charge

Complete mode. In addition, the T2X input must be

tied to VCC through a 100kΩ resistor. In this mode,

the trickle charge current will be 1.8X the normal

trickle charge level. To reset the trickle charge cur-

rent to the 1X level, the TS input must be tem-

porarily toggled low. Removing C3 forces the LED

status to gradually dim as the battery becomes fully

charged (see Figure 5).

Charge Status

Sleep / Charge Complete

Temp., OC, OV Fault

Battery Conditioning

Constant Current Mode

Constant Voltage Mode

Output Status

HI / HI / HI / HI

LO / LO / HI / HI

LO / LO / LO / LO

LO / LO / LO / HI

LO / HI / HI / HI

STAT Level

Figure 4: Microcontroller Interface Logic Output.

12

3682.2006.12.1.3

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