AAT3601_08 Datasheet, PDF (30/37 Pages) Advanced Analogic Technologies – Total Power Solution for Portable Applications

PRODUCT DATASHEET
AAT3601178
Total Power Solution for Portable Applications
Input/Output Capacitors
The LDO regulator output has been specifically optimized
to function with low cost, low ESR ceramic capacitors.
However, the design will allow for operation over a wide
range of capacitor types. The input capacitor is shared
with all LDO inputs and the step-down converter. A 10μF
ceramic output capacitor is recommended for LDO2-5
and a 22μF is recommended for LDO1.
Current Limit and
Over-Temperature Protection
The regulator comes with complete short circuit and ther-
mal protection. The combination of these two internal
protection circuits gives a comprehensive safety system
to guard against extreme adverse operating conditions.
I²C Serial Interface
and Programmability
Serial Interface
Many of the features of the AAT3601 can be controlled via
the I²C serial interface. The I²C serial interface is a wide-
ly used interface where it requires a master to initiate all
the communications with the slave devices. The I²C pro-
tocol consists of 2 active wire SDA (serial data line) and
SCL (serial clock line). Both wires are open drain and
require an external pull up resistor to V_CC (SYSOUT may
be used as V_CC). The SDA pin serves I/O function, and the
SCL pin controls and references the I²C bus. I²C protocol
is a bidirectional bus which allows both read and write
actions to take place, but the AAT3601 supports the write
protocol only. Since the protocol has a dedicated bit for
Read or Write access (R/W), when communicating with
AAT3601, this bit must be set to “0”.
The timing diagram below depicts the transmission
protocol.
START MSB
Chip
Address
ACK from slave
LSB W ACK MSB
Register
Address
ACK from slave
LSB ACK MSB
Data
SCL
SDA
10011000
including R/W bit,
Chip Address = 0x98
Figure 9: I²C Timing Diagram.
ACK from slave
LSB ACK STOP
30
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3601.2008.07.1.1