AAT3697 查看數據表（PDF） - Advanced Analogic Technologies
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AAT3697 Datasheet PDF : 19 Pages
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BatteryManagerTM
The DATA pin function logic is active low and should nor-
mally be pulled high to VADP. This data line can also be
pulled high to the same level as the high state for the 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 pull-up
resistor is too high, the strobe pulse from the system
microcontroller could 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 on the VADP input. If the data line is pulled
high to a voltage level less than 5.0V, the pull-up resistor
PRODUCT DATASHEET
AAT3697
2A Lithium-Ion/Polymer Battery Charger
can be calculated based on a recommended minimum
pull-up current of 3mA. Use the following formula:
Eq. 6: 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 AAT3697 status
data control will reply the data word back to the system
microcontroller 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 TDATA.
1.8V to 5.0V
IN
AAT3697
Status
Control
OUT
Timing Diagram
DATA Pin
RPULL_UP
GPIO
Figure 3: Data Pin Application Circuit.
IN
OUT
µP GPIO
Port
SQ
CK
Data
SQPULSE
System Reset
System Start
TSYNC
TLAT
TDATA(RPT) = TSYNC + TLAT < 2.5 PDATA
TOFF > 2 PDATA
PDATA
N=1
N=2
TOFF
N=3
14
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3697.2008.02.1.3
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