Datasheet

2003 Apr 10 26
NXP Semiconductors Preliminary specification
Stereo audio codec with SPDIF interface UDA1355H
8.3 Microcontroller mode pin assignment
In microcontroller mode all features become available, such as volume control, PGA gain and mixing (in some modes).
The pin functions are defined in Table 12.
Table 12 Microcontroller mode pin assignment
PIN
SYMBOL
L3-BUS
SYMBOL
I
2
C-BUS
LEVEL DESCRIPTION
4 LOCK LOCK LOW FPLL and SPDIF are out of LOCK
HIGH FPLL in lock when SPDIF is not used; FPLL or SPDIF in lock when
SPDIF is used
16 RESET RESET LOW normal operation
HIGH reset
17 no function no function LOW connect to ground
18 A0 A0 − A0 address input/output bit (for microcontroller register)
19 U_RDY U_RDY LOW user bit stable
HIGH new user bit
20 SEL_STATIC SEL_STATIC MID I
2
C-bus mode
LOW L3-bus mode
HIGH static mode
21 USER USER − user bit output (new bit every SPDIF sub-frame)
22 AC3 AC3 LOW no I
2
S-bus data preamble detected
HIGH I
2
S-bus data preamble detected
29 L3MODE no function − L3MODE for L3-bus mode; no function for I
2
C-bus
30 L3CLOCK SCL − L3CLOCK for L3-bus mode or SCL for I
2
C-bus mode
31 L3DATA SDA − L3DATA for L3-bus mode or SDA for I
2
C-bus mode
44 MUTE MUTE LOW no mute
HIGH mute active