Usb Interface; Pcm Interface - Laird BT800 Series Hardware Integration Manual

BT800-ST Hardware Integration Guide
Version 1.5

8.3 USB Interface

BT800 has a full-speed (12 Mbps) USB interface for communicating with other compatible digital devices. The USB
interface on the BT800 acts as a USB peripheral, responding to requests from a master host controller.
BT800 supports the Universal Serial Bus Specification (USB v2.0 Specification) and USB Battery Charging
Specification, available from http://www.usb.org. For more information on how to integrate the USB interface on
BT800, see Figure 19 located in the following section:
As well as describing USB basics and architecture, the application note describes:
Power distribution for high and low bus-powered configurations

Power distribution for self-powered configuration, which includes USB VBUS monitoring

USB enumeration

Electrical design guidelines for power supply and data lines, as well as PCB tracks and effects of ferrite beads

USB suspend modes and Bluetooth low-power modes
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Global suspend
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Selective suspend, includes remote wake

Wake on Bluetooth, includes permitted devices and set-up prior to selective suspend

Suspend mode current draw
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PIO status in suspend mode
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Resume, detach, and wake PIOs
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Battery charging from USB: dead battery provision, charge currents, charging in suspend modes and USB

VBUS voltage consideration
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USB termination when interface is not in use
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Internal modules, certification and non-specification compliant operation


8.4 PCM Interface

The audio PCM interface on the BT800 supports:
Continuous transmission and reception of PCM encoded audio data over Bluetooth.

Processor overhead reduction through hardware support for continual transmission and reception of PCM

data.
A bidirectional digital audio interface that routes directly into the baseband layer of the firmware. It does not

pass through the HCI protocol layer.
Hardware on the BT800 for sending data to and from a SCO connection.

Up to three SCO connections on the PCM interface at any one time.

PCM interface master, generating PCM_SYNC and PCM_CLK.

PCM interface slave, accepting externally generated PCM_SYNC and PCM_CLK.

Various clock formats including:

Long Frame Sync
-
Short Frame Sync
-
GCI timing environments.

13-bit or 16-bit linear, 8-bit µ-law, or A-law companded sample formats.

Receives and transmits on any selection of three of the first four slots following PCM_SYNC.

The PCM configuration options are enabled by setting PSKEY_PCM_CONFIG32.
8.4.1 PCM Interface Master/Slave
When configured as the master of the PCM interface, the BT800 generates PCM_CLK and PCM_SYNC.
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www.lairdtech.com/bluetooth
USB Dongle Design Example Using
12
BT800.
Laird