LMX9838SB National Semiconductor, LMX9838SB Datasheet - Page 11

• Manufacturer Part Number: LMX9838SB
• Manufacturer: National Semiconductor

Specifications of LMX9838SB

• Lead Free Status / Rohs Status: Compliant

OKI
MSM7717
Winbond
W681310
Winbond
W681360
PCM slave (Note 26)
Note 23: If OP3 is 1, must use 1K pull up
Note 24: If OP4 is 1, must use 1K pull up
Note 25: If OP5 is 1, must use 1K pull up
11.3 AUDIO PORT
11.3.1 Advanced Audio Interface
The Advanced Audio Interface (AAI) is an advanced version
of the Synchronous Serial Interface (SSI) that provides a full-
duplex communications port to a variety of industry-standard
13/14/15/16-bit linear or 8-bit log PCM codecs, DSPs, and
other serial audio devices.
The interface allows the support one codec or interface. The
firmware selects the desired audio path and interface config-
uration by a parameter that is located in RAM (imported from
Note 26: In PCM slave mode, parameters are stored in NVS. Bit clock and frame clock must be generated by the host interface.
PCM slave configuration example: PCM slave uses the slot
0, 1 slot per frame, 16 bit linear mode, long frame sync, normal
frame sync. In this case, 0x03E0 should be stored in NVS.
See “LMX9838 Software Users Guide” for more details.
11.4 AUXILIARY PORTS
11.4.1 RESET#
The RESET# is active low and will put radio and baseband
into reset.
11.4.2 General Purpose I/Os
The LMX9838 offers 3 pins which either can be used as indi-
cation and configuration pins or can be used for General
Purpose functionality. The selection is made out of settings
derived out of the power up sequence.
OP3 (Note 23)
Audio setting
1
1
1
1
OP4 (Note 24)
Advanced audio interface
Advanced audio interface
Advanced audio interface
Advanced audio interface
0
0
1
1
Interface
TABLE 7. UART Frequency Settings
TABLE 8. Audio Path Configuration
OP5 (Note 25)
0
1
0
1
A-law and u-law
8-bit log PCM
8-bit log PCM
13-bit linear
(a-law only)
8/16 bits
Format
11
UART speed read from NVS
UART speed 9.6 kbps
UART speed 115.2 kbps
UART speed 921.6 kbps
non-volatile storage or programmed during boot-up). The au-
dio path options include the OKI MSM7717 codec, the Win-
bond W681360/W681310 codecs and the PCM slave through
the AAI.
In case an external codec or DSP is used the LMX9838 audio
interface generates the necessary bit and frame clock driving
the interface.
Table 8 summarizes the audio path selection and the config-
uration of the audio interface at the specific modes.
The LMX9838 supports one SCO link.
In General Purpose configuration the pins are controlled hard-
ware specific commands giving the ability to set the direction,
set them to high or low or enable a weak pull-up.
In alternate function the pins have pre-defined indication func-
tionality. Please see Table 9 for a description on the alternate
indication functionality.
OP4/PG4
PG6
PG7
128 - 1024 kHz
AAI Bit Clock
Pin
TABLE 9. Alternate GPIO Pin Configuration
520 kHz
520 kHz
520 kHz
Operation Mode pin to configure
Transport Layer settings during boot-up
GPIO - Link Status indication
RF Traffic indication
AAI Frame Clock
Function
8 kHz
8 kHz
8 kHz
8 kHz
Description
AAI Frame Sync
Pulse Length
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