AAT3685-1 Ver la hoja de datos (PDF) - Analog Technology Inc

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componentes Descripción

Fabricante

AAT3685-1

Lithium-Ion/Polymer Battery Charger

Analog Technology Inc 

BatteryManagerTM

N DATA Report Status

1 Chip Over-Temperature Shutdown

2 Battery Temperature Fault

3 Over-Voltage Turn Off

4 Not Used

5 Not Used

6 Not Used

7 Not Used

8 Not Used

9 Not Used

10 Not Used

11 Not Used

12 Not Used

13 SETH Battery Condition Mode

14 SETH Charge Reduction in Constant Current Mode

15 SETH Constant Current Mode

16 SETH Constant Voltage Mode

17 SETH End of Charging

18 SETL Battery Condition Mode

19

SETL Charge End of Charging Reduction in Constant

Current Mode

20 SETL Constant Current Mode

21 SETL Constant Voltage Mode

22 SETL End of Charging

23 Data Report Error

Table 3: Serial Data Report Table.

The DATA pin function is active low and should normally

be pulled high to VADP/USB. This data line may also be

pulled high to the same level as the high state for the

PRODUCT DATASHEET

AAT3685

Lithium-Ion/Polymer Battery Charger

logic I/O port on the system microcontroller. In order for

the DATA pin control circuit to generate clean sharp

edges for the data output and to maintain the integrity

of the data timing for the system, the pull-up resistor on

the data line should be low enough in value so that the

DATA signal returns to the high state without delay. If

the value of the pull-up resistor used is too high, the

strobe pulse from the system microcontroller may

exceed the maximum pulse time and the DATA output

control could issue false status reports. A 1.5kΩ resistor

is recommended when pulling the DATA pin high to 5.0V

at the VUSB input. If the data line is pulled high to a volt-

age level less than 5.0V, the pull-up resistor may be

calculated based on a recommended minimum pull-up

current of 3mA. Use the following formula:

Eq. 3: RPULL-UP ≤

VPULL-UP

3mA

Data Timing

The system microcontroller should assert an active low

data request pulse for minimum duration of 200ns; this is

specified by TLO(DATA). Upon sensing the rising edge of the

end of the data request pulse, the AAT3685 status data

control will reply the data word back to the system micro-

controller after a delay specified by the data report time

specification TDATA(RPT). The period of the following group

of data pulses will be specified by the TDATA specification.

IN

AAT3685

Status

Control

OUT

1.8V to 5.0V

DATA Pin

RPULL_UP

GPIO

Figure 4: Data Pin Application Circuit.

IN

OUT

μP GPIO

Port

16

www.analogictech.com

3685.2007.12.1.4

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