National Semiconductor LMX9838DONGLE Hardware User's Manual page 4

9.0 Board components and Pin As-
signments
A summary of the configuration and selection jumpers is
provided in the tables that follow. Reference both the sche-
matic and PCB layout (included on the CD in the kit)
Table 1. Major Components List
Device
National LMX9838 Serial Port Module - Refer-
U1
ence the device datasheet.
National LP3985 Low-Dropout Voltage Regula-
U3
tor
Maxim MAX3225 1 Mbps High Speed UART
U2
Driver
Table 2 Connectors Summary
Connector Description
J7 Battery Connector
2mm pitch
J6 DC jack
J8 DP9 serial connec-
tor (male)
J5 External processor
interface
J4 Advance Audio
interface
Table 3 Jumper and Test Point Summary
Jumper /
Description
Test Point
J1, J2 and Clock & UART set-
J3 ting jumper
Table 4 Switch and LEDs
Switch/LED
S1
D1
D2
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Description
Details
Maximum input volt-
age is 6V
Same as above
See Table 5
See Table 6
See Table 7
Details
See Table 8
Description
Reset button
Operation Status
Data Traffic (TX/RX)
Table 5 J8 DP9 (male) Pin Assignments
Pin # Signal name
1 NC
2 RxD
3 TxD
4 NC
5 GND
6 NC
7 RTS
8 CTS
9 NC
Table 6 J5 External Processor Interface
Pin # Signal name
1 POWER_D# ON/OFF control of LMX9838
2 VCC LDO output (3.3V)
3 GND Ground
4 TXD Transmit Data (output)
5 CTS# Clear to send (input)
6 RXD Receive Data (input)
7 RTS# Ready to send (output)
8 VCC_CORE 1.8V voltage regulator input/out-
_IN put
9 RESET# Reset (input)
Advance Audio Interface
Table 7 J4
Pin # Signal name
1 VCC
LDO output (3.3V)
2 SCLK
Advanced Audio Interface Clock
3 STD
Advanced Audio Interface
Transmit Data
4 SFS
Advanced Audio Interface Frame
Synchronization
5 SRD
Advanced Audio Interface
Receive Data
6 GND
Ground
Table 8 UART interface setting
J2 J3 J1
Short Short Short
Short Open Short
Open Short Short
Open Open Short
4
Description
No connection
Receive Data (input)
Transmit Data (output)
No connection
Ground
No connection
Ready to send (output)
Clear to send (input)
No connection
Description
Description
UART baud rate
921600bps
115200bps(default)
9600bps
NVS (Default 9600bps)