UDA1321 Datasheet, PDF (24/44 Pages) NXP Semiconductors – Universal Serial Bus USB Digital-to-Analog Converter DAC

Philips Semiconductors
Universal Serial Bus (USB)
Digital-to-Analog Converter (DAC)
Preliminary specification
UDA1321
Table 7 No digital I/O communication
PIN
GP5
GP4
GP3
GP0
GP2
GP1
INPUT/OUTPUT
output; not programmable; note 2
inputs; programmable; note 1
outputs; programmable
FUNCTION 1
connect/disconnect
alarm mute; note 3
HID input 2
HID input 1
standby; note 4
mute; note 5
FUNCTION 2
connect/disconnect
HID input 3
HID input 2
HID input 1
HID/LED output 2; note 6
HID/LED output 1; note 6
Notes
1. The input pins must have a pull-up resistor.
2. Connect/disconnect: holds the USB ‘disconnected’ as long as the initialization is not finished.
3. Alarm mute: input to switch the sound off; specially used if the USB host program does not respond to the control.This
pin acts directly on the sound and passes the mute to the USB host.
4. Standby is switched on (output becomes LOW) after a programmable time if mute is active (see Byte 18 of Table 6).
5. Mute is switched on (output becomes LOW) after a programmable time if the isochronous data flow is interrupted
(see Byte 17 of Table 6).
6. For selection between HID/LED application see configuration map byte 11 (output is active HIGH).
Table 8 4-pins digital I/O communication
PIN
GP5
GP4
GP3
GP2
GP1
GP0
INPUT/OUTPUT
output; not programmable; note 1
digital I/O-bus
input; programmable
FUNCTION 1
connect/disconnect
BCKO
WSO
DO
DI
HID input 1
FUNCTION 2
connect/disconnect
BCKO
WSO
DO
DI
alarm mute; note 2
Notes
1. Connect/disconnect: holds the USB ‘disconnected’ as long as the initialization is not finished.
2. Alarm mute: input to switch the sound off; specially used if the USB host program does not respond to the control.
This pin acts directly on the sound and passes the mute to the USB host.
1998 Oct 06
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