LMX9820SB/NOPB National Semiconductor, LMX9820SB/NOPB Datasheet - Page 5

• Manufacturer Part Number: LMX9820SB/NOPB
• Manufacturer: National Semiconductor

Specifications of LMX9820SB/NOPB

• Lead Free Status / Rohs Status: Compliant

Revision 1.0
5.0 Pad Descriptions
1.
Pad Name
Clk-
Clk+
32kHz_CLKI
32kHz_CLKO
RF_inout
ISEL2
ISEL1
Pad Name
USB_VCC
USB_D+
USB_D-
USB_Gnd
Pad Name
Uart_tx
Uart_rx
Uart_rts#
Uart_cts#
Treat as No Connect, Pad required for mechanical stability.
Location
Location
Location
G12
Pad
B13
C13
H13
Pad
F12
E11
E12
Pad
C10
D10
J13
B8
B9
H8
D9
C9
Table 3. USB Interface Signals (Not supported by lmx9820 firmware)
Input/Output
Input/Output
Input/Output
Direction
Direction
Direction
Output
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Table 2. System Interface Signals
Table 4. UART Interface Signals
Description
Xtal g or Negative Clock Input. Typically connected along with
XTAL_D to an external surface mount AT cut crystal. Can also be con-
figured as a frequency input when using an external crystal oscillator.
When configured as a frequency input, typically connected to Ground
with a 10 pF capacitor.
Xtal d or Positive Clock Input. Typically connected along with
XTAL_G to an external surface mount AT cut crystal. Can also be con-
figured as a frequency input when using an external crystal oscillator.
When configured as a frequency input, is typically connected to an ex-
ternal Temperature Compensated Crystal Oscillator (TCXO) through
an Alternating Current (AC) coupling capacitor.
32 kHz Clock input. Not supported. Place pad and do not connect to
VCC or Ground.
32 kHz Clock Output. Not supported. Place pad and do not connect to
VCC or Ground.
RF Antenna Port. 50 nominal impedance. Typically connected to an
antenna through a 6.8pF capacitor.
Module Interface Select Input Bit 1.
Module Interface Select Input Bit 0.
Description
USB Transceiver Power Supply +
USB Data Positive
USB Data Negative
USB Transceiver Ground
Description
UART Host Control Interface Transport, Transmit Data.
UART Host Control Interface Transport, Receive Data.
UART Host Control Interface Transport, Request to Send.
UART Host Control Interface Transport, Clear to Send.
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