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LMX9838

Data device

with Sensor

RTS

CTS

TXD

RXD

CTS

RTS

RXD

TXD

PG6

RESET#

22 pF

1 k:

PG7 OP3 OP4 OP5

22 pF

32.768 KHZ (OPTIONAL)

330:

LMX9838

SNOSAZ9F –JULY 2007–REVISED DECEMBER 2014

www.ti.com

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Typical Applications

The following diagrams show two application examples for LMX9838 implementations.

Figure 6 illustrates a cable replacement application, requiring the physical UART interface to a data device like a

sensor. The LMX9838 just waits for an incoming link and forwards data between the data device and the

bluetooth link. PG6 acts as active link indicator and is used to enable the data transfer from the sensor. A

32.768khz crystal may be is used to reduce power consumption while waiting for the incoming link.

Figure 7 shows an example for the connection to a host controller, which can include a simple application to

control the LMX9838. The figure also includes the connection to a PCM codec, in case the host controller

application includes an audio profile. Reset, OP4 and OP5 are controlled by the host for full control of the

LMX9838 status.

Refer to the Power Supply Schematics section for more detailed descriptions for LMX9838 designs.

Figure 6. Example For A Cable Replacement Application

Product Folder Links: LMX9838

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