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BTM41 DATASHEET

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5. PHYSICAL INTERFACE

5.1

Power Supply

The transient response of the regulator is important. If the power rails of the module are

supplied from an external voltage source, the transient response of any regulator used

should be 20µs or less.

5.2

Audio Interfaces

5.2.1

PCM

The audio pulse code modulation (PCM) interface supports continuous transmission and

reception of PCM encoded audio data over Bluetooth.

Pulse Code Modulation (PCM) is a standard method used to digitize audio (particularly

voice) for transmission over digital communication channels. Through its PCM interface,

BTM41

provide hardware support for continual transmission and reception of PCM

data, thus reducing processor overhead for wireless headset applications.BTM41offers a

bi-directional digital audio interface that routes directly into the baseband layer of the

on-chip firmware. It does not pass through the HCI protocol layer.

Hardware on BTM41 allows the data to be sent to and received from a SCO connection. Up

to three SCO connections can be supported by the PCM interface at any time.

5.3

RF Interface

The module integrates a balun filter. The user can connect a 50ohms antenna directly to the

RF port.

5.4

General Purpose Analog IO

The general purpose analog IOs can be configured as ADC inputs by software. Do not

connect them if not use.

5.5

General Purpose Digital IO

There are nine general purpose digital IOs defined in the module. All these GPIOs can be

configured by software to realize various functions, such as button controls, LED displays

or interrupt signals to host controller, etc. Do not connect them if not use.