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PDF UDA1331H Data sheet ( Hoja de datos )
| Número de pieza | UDA1331H | |
| Descripción | Universal Serial Bus USB Audio Playback Peripheral APP | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
UDA1331H
Universal Serial Bus (USB) Audio
Playback Peripheral (APP)
Preliminary specification
Supersedes data of 1998 Apr 16
File under Integrated Circuits, IC01
1998 Oct 06
1 page  
Philips Semiconductors
Universal Serial Bus (USB) Audio
Playback Peripheral (APP)
Preliminary specification
UDA1331H
PINNING
SYMBOL
n.c.
GP5/WSI
SCL
SDA
P0.7
EA
GP1/DI
PSEN
ALE
GP2/DO
P2.0
P2.1
GP3/WSO
GP4/BCKO
SHTCB
n.c.
D−
P2.2
P2.3
D+
P2.4
P2.5
P2.6
P2.7
VDDI
n.c.
n.c.
n.c.
VSSI
VSSE
n.c.
VDDE
n.c.
n.c.
n.c.
VSSX
XTAL1
XTAL2
VDDX
n.c.
PIN
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
29
30
31
32
33
34
35
36
37
38
39
40
1998 Oct 06
I/O DESCRIPTION
− not connected
I/O general purpose pin 5 or word select input
I/O serial clock input (I2C-bus)
I/O serial data input/output (I2C-bus)
I/O Port 0.7 of the microcontroller
I/O external access (active LOW)
I/O general purpose pin 1 or data input
I/O program store enable (active LOW)
I/O address latch enable (active HIGH)
I/O general purpose pin 2 or data output for extra DSP chip
I/O Port 2.0 of the microcontroller
I/O Port 2.1 of the microcontroller
I/O general purpose pin 3 or master word select output for extra DSP chip
I/O general purpose pin 4 or master bit clock output for extra DSP chip
I shift clock TCB input (active HIGH)
− not connected
I/O negative data line of the differential data bus conform to the USB-standard
I/O Port 2.2 of the microcontroller
I/O Port 2.3 of the microcontroller
I/O positive data line of the differential data bus conform to the USB-standard
I/O Port 2.4 of the microcontroller
I/O Port 2.5 of the microcontroller
I/O Port 2.6 of the microcontroller
I/O Port 2.7 of the microcontroller
− digital supply voltage core
− not connected
− not connected
− not connected
− digital ground core
− digital ground I/O pins
− not connected
− digital supply voltage I/O pins
− not connected
− not connected
− not connected
− crystal oscillator ground
I crystal oscillator input 1
O crystal oscillator output 2
− crystal oscillator supply voltage
− not connected
5
5 Page 
Philips Semiconductors
Universal Serial Bus (USB) Audio
Playback Peripheral (APP)
Preliminary specification
UDA1331H
HUMAN INTERFACE DEVICE SPECIFIC DESCRIPTORS
The inputs defined on the UDA1331H are transmitted via
the USB to the host according to the HID class. The host
responds with the appropriate settings via the audio device
class for the audio related parts or via the HID class for the
HID related inputs and outputs of the UDA1331H.
A HID descriptor is necessary to inform the host about the
conception of the user interface. The host communicates
via the HID device driver using either the control pipe or
the interrupt pipe. The UDA1331H uses USB endpoint 0
(control pipe) to respond to the HID specific ‘Get/set report
request’ to receive or transmit data from or to the
UDA1331H. The UDA1331H uses the status interrupt
endpoint as interrupt pipe for polling asynchronous data.
The UDA1331H is a high-speed device. The maximum
transaction size is 64 bytes per USB frame and the polling
rate is defined at a maximum of every 1 ms.
The host requests the configuration descriptor which
includes the standard interface descriptor, the HID
endpoint descriptor and the HID descriptor. The HID
device driver of the host then requests the report
descriptor.
Report descriptors are composed of pieces of information
about the device. Each piece of information is called an
item. All items have a 1-byte prefix that contains the item
tag, type and size. In the UDA1331H only the short item
basic type is used.
The hosts HID device driver will parse the report descriptor
and the defined items. By examining all of these items, the
HID class driver is able to determine the size and
composition of data reports from the device.
The main items of the UDA1331H are input and output
reports. Input reports are sent via the interrupt pipe
(UDA1331H USB address 3). Input and output reports can
be requested by the host via the control endpoint (USB
address 0).
The UDA1331H supports a maximum of three
pushbuttons, which represents a certain feature of the
UDA1331H. If pressed by the user the pushbutton will go
to its ‘ON’ state, if not pressed the pushbutton will go back
to its ‘OFF’ state. The UDA1331H supports a maximum of
two outputs for e.g. user LEDs.
For more information about the input and output functions
of the UDA1331H see the application documentation of
the device.
Controlling the USB Audio Playback Peripheral (APP)
This section describes the functionality of the feature unit
of the UDA1331H. The mapping of this functionality onto
USB descriptors is as implemented in the firmware.
The sound features as defined in the “USB Device Class
Definition for Audio Devices” are mapped on the
UDA1331H specific feature registers by the
microcontroller. These specific sound features are:
• Volume control (separate for left and right stereo
channels, no master channel)
• Mute control (only master channel)
• Treble control (only master channel)
• Bass control (only master channel)
• Dynamic bass boost control (only master channel).
These specific features can be activated via the host
(audio device class requests) or via the GP pins (HID plus
audio device class requests). Via the I2C-bus the user is
able to download the necessary configuration data for
different applications (definition of the function of the GP
pins, with or without digital I/O functionality, etc.).
The mapping and control of the standard USB audio
features and UDA1331H specific features is described
below.
VOLUME CONTROL
Volume control is possible via the host or via predefined
GP pins. The setting of 0 dB is always referenced to the
maximum available volume setting. Table 3 gives the
mapping of wVolume value (as defined in the “USB
Device Class Definition for Audio Devices”) upon the
actual volume setting of the USB APP. When using the
UDA1331H, the range is 0 down to −60 dB (in steps of
1 dB) and −∞ dB. Independant control of ‘left’/’right’
volume is possible. It should be noted that wVolume
bits B7 to B0 are not used. Values above 0 dB are
returned as 0 dB. The volume value at start-up of the
device is defined in the selected configuration map.
Balance control is possible via the separate volume control
option of both channels. Therefore the characteristics of
the balance control are equal to the volume control
characteristics.
1998 Oct 06
11
11 Page | ||
| Páginas | Total 40 Páginas | |
| PDF Descargar | [ Datasheet UDA1331H.PDF ] | |
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