Portable Audio
4-Channel I
2
C Switch with Interrupt and Reset
PCA9545A
Get samples, datasheets and app reports at:
www.ti.com/sc/device/PCA9545A
51
2-Port, Integrated PHY and Link-Layer Chip
for 1394 PC Peripherals
TSB43AA82, TSB43AA82A
Get datasheets at:
www.ti.com/1394
The PCA9545A is a quad, bidirectional translating switch controlled via
the I
2
C bus. The SCL/SDA upstream pair fans out to four downstream
pairs, or channels. Any individual SCn/SDn channel or combination of
channels can be selected, determined by the contents of the program-
mable control register.
Key Features
• Four bidirectional translating switches
• Each channel (SCLn/SDAn) can be selected via I
2
C bus
• Low RDS
ON
switches (10
typically)
• V
CC
range: 2.3 to 5.5 V
• Voltage-level translation between 2.5-, 3.3- and 5-V buses
• Internal I
2
C address: 1110 0xx
• Two address pins
• One to four channels can be selected at one time
• Interrupt output signals change on a channel
• RESET input initializes the device without de-powering it and
deselects all channels
Applications
• System monitoring: Fan, LED and temperature
• Cell phones
• MP3 players
V
CC
= 3.3 V
I
2
C
Master
SCL
SDA
2.5 V
The TSB43AA82 integrated PHY and link-layer controller supports
asynchronous transfers, providing a 1394 connectivity solution for
high-capacity digital audio players (DAPs). This high-speed, 400-Mbps
connection allows you to incorporate capacity in your DAP without
sacrificing small form factor. Players like the Apple iPOD
®
DAP use a
1.8-inch hard disk drive as the storage medium for songs and data.
The TSB43AA82 will provide the high-speed link to the computer
needed to load a large number of songs in a reasonable timeframe. A
generic 8-/16-bit host bus interface supports parallel, multiplexed
connections to the microcontroller at rates up to 40 MHz.
Key Features
• IEEE 1394a-2000 compliant
• Single 3.3-V supply
• Internal 1.8-V circuit reduces power consumption
• Integrated 400 Mbps, 2-port PHY
• Internal voltage regulator
• IEEE 1394 related functions:
Automated read response for ConfigROM register access
Automated single retry protocol and split transaction control
Applications
• High-capacity digital audio players
• PC and Mac peripherals
PCA954xA
SCL
SDA
SCL0
SDA0
5.5 V
Configuration Register (CFR)
2.7 V
System
I
2
C
Config
ROM
Asynch.
FIFO
Command
ATF
Auto
Response
Fast ORB
Exchanger (FOX)
MOAF_AGENT
COAF_AGENT
SCL1
SDA1
5V
System
I
2
C
MTQ
8/16 HOST
I/F
CTQ
ARF
Transaction
Manager
(TrMgr)
Port 2
SCL2
SDA2
3V
I
2
C
System
MRF
CRF
SCL3
SDA3
I
2
C
System
DMA
8/16 Bulky
I/F
BDFIFO
Packetizer
Log
Link
Core
1394a
Port 1
DTF
PCA9545A typical application circuit.
DRF
Packet
Distributor
TSB43AA82 block diagram.
Texas Instruments 1Q 2006
Audio Solutions Guide
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