uda1335h NXP Semiconductors, uda1335h Datasheet - Page 27

• Manufacturer Part Number: uda1335h
• Description: Universal Serial Bus Usb Audio Playback Recording Peripheral Aprp
• Manufacturer: NXP Semiconductors

Philips Semiconductors
These port configurations can be chosen via the configuration map at start-up of the UDA1335H.
The user can also make use of an I
the configuration map. Some of the supported HID functions are located in the I
used, the HID functions normally located in the expander must be declared as “unassigned” in the HID report descriptor.
The bit which indicates if an external expander is used must then be put on zero.
Table 11 Definition of the general purpose pins and I
Notes
1. Connect/disconnect: This pin can be used to avoid malfunction during initialisation phase of the UDA1335H. While
2. HID input 1 to 6 and interrupt input: A change on the expander can be signalled to the UDA1335H via the interrupt
3. Selector output: This pin can be used for switching the audio selector as illustrated in Fig.4. If the configuration map
4. Mute output: This output is activated if the isochronous signal is not available during a certain time. The output levels
5. Standby output: This output is activated if the UDA1335H is muted during a certain time. The output levels and the
6. Output pins 1 to 3: All the output pins are set via the I
7. For the I
1998 Aug 28
General purpose I/O
I
2
C-bus expander; note 7
Universal Serial Bus (USB) Audio
Playback Recording Peripheral (APRP)
initialization takes place, the USB can be kept disconnected while the software of the microcontroller reads in the
configuration map. When the UDA1335H is ready, the USB becomes connected and enumeration can start. Using
the 6-pin I
input. After detecting this signal the UDA1335H will decode the buttons. When no expander is used, the interrupt pin
must be connected to the ground. The HID input pins and the interrupt input pin on the UDA1335H are scanned each
20 ms. If the interrupt in pin indicates a change on the expander, the expander input pins are scanned once. Using
the 6-pin I
pins must have a pull-up resistor.
does not request this output pin, the output is always LOW.
and the time are programmable in the configuration map.
time are programmable in the configuration map.
PINS
GP5
GP4
GP3
GP2
GP1
GP0
P0
P1
P2
P3
P4
P5
P6
P7
2
C-bus expander, the PCF8574P remote 8-bit I/O expander for I
2
2
S-bus, the interrupt pin is not available and the inputs on the expander are scanned every 20 ms. All input
S-bus, the connect/disconnect will be moved to the I
mute or standby output
mute or standby output
NO I
connect/disconnect
selector output
interrupt input
2
output pin 1
output pin 2
output pin 3
HID input 2
HID input 1
HID input 3
HID input 4
HID input 5
HID input 6
S-BUS USAGE
2
C-bus expander. The usage of an I
2
C-bus expander pins; notes 1 to 6
4-PIN I
mute or standby output
connect/disconnect
2
C-bus. The function is according the configuration map.
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selector output
interrupt input
DATA output
output pin 1
output pin 2
BCK output
DATA input
HID input 3
HID input 4
HID input 5
HID input 6
WS output
2
S-BUS USAGE
2
C-bus expander.
2
C-bus expander (yes/no) can be indicated via
2
C-bus can be used.
2
C-bus expander. If this expander is not
6-PIN I
mute or standby output
connect/disconnect
selector output
Preliminary specification
DATA output
output pin 1
output pin 2
BCK output
HID input 4
HID input 5
HID input 6
DATA input
WS output
BCK input
2
WS input
S-BUS USAGE
UDA1335H