Laird BT800 series, Hardware Integration Manual

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BT800 Hardware Integration Guide
Version 0.2
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14 CONN-GUIDE-BT800_v0_2
9 I
NTERFACE
PIO (Programmable I/O Ports) 9.1
See the Device Terminal Functions section for the list of supplies to the PIOs.
PIO lines are configured through software to have either weak or strong pull-ups or pull-downs. All PIO
lines are configured as inputs with weak pull-downs at reset and have additional individual bus keeper
configuration.
WLAN Coexistence Interface 9.2
Dedicated hardware is provided to implement a variety of WLAN coexistence schemes. There is
support for:

Channel skipping AFH

Priority signalling

Channel signalling

Host passing of channel instructions
The BT800 supports the WLAN coexistence schemes:

Unity-3

Unity-3e

Unity+
For more information see Bluetooth and IEEE 802.11 b/g Co-existence Solutions Overview.
USB Interface 9.3
BT800 has a full-speed (12 Mbps) USB interface for communicating with other compatible digital devices.
The USB interface on BT800 acts as a USB peripheral, responding to requests from a master host
controller.
BT800 supports the Universal Serial Bus Specification, Revision v2.0 (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 the Bluetooth and USB Design Considerations Application
Note.
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:

Global suspend

Selective suspend, includes remote wake

Wake on Bluetooth, includes permitted devices and set-up prior to selective suspend

Suspend mode current draw

PIO status in suspend mode