PTC PT8915_10

PT8915
USB Speaker Controller with Class-D Amp.
DESCRIPTION
The PT8915 is a cost-efficient single chip for USB
speaker application. It integrated USB controller, 16 bit
audio DAC, line input and high power, high efficient
Class-D audio amplifier in one chip. Only few external
components needed in application circuits makes it
suite for the USB powered speaker system.
The I/O interface is totally follow the USB audio class
specification. No special driver software needs to
install on user’s computer and support most popular
Operating System in the recent market. The PT8915 is
a truly plug and play USB audio device. The
embedded GPIO pins provide the mute and volume
adjustment functions whatever the USB port is
connected or not, Via the I²C pins. Vendor can store
vendor specified VID, PID, language ID and product
string information in external EEPROM.
FEATURES
• Compliant with USB2.0 full speed specification.
• Compliant with USB Audio class specification.
• Compliant with USB HID class specification for
volume and mute remote control.
• Supply voltage: 4.5~5.5V
• Build-in class-D audio amplifier with 2Watt output
power for each channel.
• Built-in PLL(48MHz for USB)
• Built-in USB/LINE IN function for selecting PC or
external signal.
• Key pad control in USB and Line IN function for
mute, volume up and volume down.
• I2C interface for optional external EEPROM to
store vendor specified VID, PID, language ID and
product string information.
• Packages: 28 pins SOP
APPLICATION
• USB Speaker
BLOCK DIAGRAM
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT8915
APPLICATION CIRCUITS
V1.2
2
December 2009
PT8915
ORDER INFORMATION
Valid Part Number
PT8915-S
Package Type
28 Pins, SOP, 300mil
Top Code
PT8915-S
PIN CONFIGURATION
V1.2
3
December 2009
PT8915
PIN DESCRIPTION
V1.2
Pin Name
VDD1
USBDP
USBDM
Vreg
I/O
Power
I
I
Power
USB/LINE
I
GND2
Vref
VDD2
DACOR
VOLINR
INR
INL
VOLINL
DACOL
MUTE
VOLUP/DN
OUTLP
GNDL
VDDL
OUTLN
OUTRN
VDDR
GNDR
OUTRP
IICSDA
IICSCL
OSCO
OSCI
power
Power
Power
O
I
I
I
I
O
I
I
O
Power
Power
O
O
Power
Power
O
O
O
O
I
Description
USB 5V power
USB data plus
USB data minus
Regulator 3.3V power
USB/Line-In mode selector, issue remote wake up
signal for PC/Notebook system suspend.
DAC ground
Reference voltage
DAC power
DAC output right channel
Volume in right channel
Line in right channel
Line in left channel
Volume in left channel
DAC output left channel
GPIO, Mute
GPIO, Volume up/down
Left channel positive output
Left channel ground
Left channel power
Left channel negative output
Right channel negative output
Right channel power
Right channel ground
Right channel positive output
IIC data
IIC clock
Output for 12MHz oscillator
Input for 12MHz oscillator
4
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
December 2009
PT8915
IMPORTANT NOTICE
Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements,
improvements, and other changes to its products and to discontinue any product without notice at any time.
PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No
circuit patent licenses are implied.
Princeton Technology Corp.
2F, 233-1, Baociao Road,
Sindian, Taipei 23145, Taiwan
Tel: 886-2-66296288
Fax: 886-2-29174598
http://www.princeton.com.tw
V1.2
5
December 2009