AAT2601 Analogic Corporation, AAT2601 Datasheet - Page 3

• Manufacturer Part Number: AAT2601
• Manufacturer: Analogic Corporation

Pin Descriptions
2601.2008.01.1.0
2601.2008.01.1.0
Pin #
24, 25
26, 27
10
11
12
13
14
15
16
17
18
19
20
21
22
23
28
29
30
31
32
33
34
35
36
EP
1
2
3
4
5
6
7
8
9
EN_HOLD
OUTBUCK
USE_USB
Symbol
EN_TEST
ON_KEY
SYSOUT
EN_KEY
CNOISE
RESET
CHGIN
ENBAT
AVIN2
AVIN1
AGND
OUT5
OUT4
OUT3
OUT2
OUT1
PGND
ADPP
PVIN
STAT
ISET
SDA
EN2
EN3
EN4
EN5
BAT
SCL
CT
LX
TS
EP
Function
Similar to EN_HOLD but intended for use with the automatic tester or as a hands free enable input pin indi-
cating hands free phone operation with a headset. It is also internally pulled to GND when fl oating.
Enable for the system. EN_HOLD must be held high by the processor to maintain core power. It is inter-
nally pulled to GND when fl oating.
Enable for the system. An internal pull-up resistor keeps the pin pulled up to an internal supply to keep
the system off when there is no CHGIN input. Connect a normally-open pushbutton switch from this pin to
GND. There is an internal 300ms debounce delay circuit to fi lter noise.
Buffered logic output of the EN_KEY pin with a logic signal from ground to OUT1.
Enable for LDO2 (PowerAnalog or PLL). (Internally pulled low when fl oating)
Enable for LDO3 (TCXO). (Internally pulled low when fl oating)
Enable for LDO4 (TX) (Internally pulled low when fl oating)
Enable for LDO5 (RX) (Internally pulled low when fl oating)
Output for LDO5 (RX) (when shut down, pulled down with 10kΩ)
Output for LDO4 (TX) (when shut down, pulled down with 10kΩ)
Analog voltage input. Must be tied to SYSOUT on the PCB.
Output for LDO3 (TCXO)
Output for LDO2 (PowerAnalog)
Analog voltage input. Must be tied to SYSOUT on the PCB.
Output for LDO1 (PowerDigital)
Signal ground
Noise Bypass pin for the internal reference voltage. Connect a 0.01μF capacitor to AGND.
RESET is the open drain output of a 50ms reset timer. RESET is released after the 50ms timer times out.
RESET is active low and is held low during shutdown. RESET should be tied to a 10K or larger pullup to
OUTBUCK.
Open Drain output. Will pull low when V
USE_USB pin, the charge current will be reset to the default values (see Battery Charger and I
Interface and Programmability section)
Step-down Buck converter (Core) switching node. Connect an inductor between this pin and the output.
Power Ground for step-down Buck converter (Core)
Input power for step-down Buck converter (Core). Must be tied to SYSOUT.
Feedback input for the step-down Buck converter (Core)
System Power output. Connect to the input voltage pins PIN, AVIN1/2 for the step-down converter and
LDOs and other external supply requirements.
Connect to a Lithium Ion battery.
Power input from either external adapter or USB port.
When pulled high, fast charge current is set to 100mA regardless of the resistor value present on the ISET
pin. Additionally, the CHGIN-SYSOUT LDO will be disabled and the BAT-SYSOUT load switch will be enabled.
Active low enable for the battery charger (Internally pulled low when fl oating)
Battery Temperature Sense pin with 75μA output current. Connect the battery’s NTC resistor to this pin and
ground.
Charge current programming input pin (Tie a 1k to GND for maximum fast charge current). Can be used to
monitor charge current.
Charger Safety Timer Pin. A 0.1μF ceramic capacitor should be connected between this pin and GND. Con-
nect directly to GND to disable the timer function.
Battery charging status pin output. Connected internally between GND and OUT1 (PowerDigital). Used to
monitor battery charge status.
I
I
The exposed thermal pad (EP) must be connected to board ground plane and pins 16 and 21. The ground
plane should include a large exposed copper pad under the package for thermal dissipation (see package
outline).
2
2
C serial data pin, open drain; requires a pullup resistor.
C serial clock pin, open drain; requires a pullup resistor.
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Total Power Solution for Portable Applications
Total Power Solution for Portable Applications
CHGIN
> 4.5V. When this happens, depending on the status of the
PRODUCT DATASHEET
PRODUCT DATASHEET
AAT2601178
AAT2601178
2
C Serial
3
3