Philips 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
SYMBOL
L3-BUS
SYMBOL
I2C-BUS
PIN
LEVEL
DESCRIPTION
FPLL and SPDIF are out of LOCK
4
LOCK
LOCK
LOW
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
18 A0
no function
A0
LOW
−
connect to ground
A0 address input/output bit (for microcontroller register)
user bit stable
19 U_RDY
U_RDY
LOW
HIGH new user bit
20 SEL_STATIC SEL_STATIC
MID
I2C-bus mode
LOW
L3-bus mode
HIGH static mode
21 USER
22 AC3
USER
AC3
−
user bit output (new bit every SPDIF sub-frame)
no I2S-bus data preamble detected
LOW
HIGH I2S-bus data preamble detected
29 L3MODE
30 L3CLOCK
31 L3DATA
44 MUTE
no function
SCL
−
−
L3MODE for L3-bus mode; no function for I2C-bus
L3CLOCK for L3-bus mode or SCL for I2C-bus mode
L3DATA for L3-bus mode or SDA for I2C-bus mode
no mute
SDA
−
MUTE
LOW
HIGH mute active
2003 Apr 10
26
NXP [ NXP ]
