BT 900 Specifications download pdf (Page 25)

BT900-Sx Hardware Integration Guide

Intelligent BTv4.0 Dual Mode Module

Embedded Wireless Solutions Support

Center: http://ews-support.lairdtech.com

www.lairdtech.com/bluetooth

Laird

Americas: +1-800-492-2320

Europe: +44-1628-858-940

Hong Kong: +852 2923 0610

5.12.2 Wake up Host from BT900

This may be done by use of the BT900 SIO pin. Refer to the

smart

BASIC user manual for details.

5.13 Low Power Modes

The BT900 has three power modes: Run, Standby Doze and Deep Sleep. Further, the BT900 has user

configurable clocking (40MHz, 20MHz, 4MHz) allowing power consumption trade-off in Run and Standby

Doze modes.

The module is placed automatically in Standby Doze if there are no events pending (when

waitevent

statement

is encountered within a customer’s

smart

BASIC script). The module will wake up from Standby Doze via an

interrupt e.g. received character on the UART Rx line. The module wakes up every millisecond to service the

interrupt. If the module receives a UART character from either the external UART or the radio, that will cause it

to wake up.

Deep sleep is the lowest power mode. Once awakened, the system will go through a system reset.

5.14 BT and Wi-Fi Coexistence

The BT900 supports the following CSR BT-WiFi coexistence schemes:

 Unity-3 (for use with Classic BT)

 Unity-3e (for use with BLE)

Refer to the

smart

BASIC user manual for details.

5.15 BT900-SA on-board chip antenna characteristics

The BT900-SA on-board chip monopole antenna’s radiated performance depends on the host PCB layout.

The BT900 development board was used for BT900 development and antenna performance evaluation. To

obtain similar performance follow guidelines in section PCB Layout on Host PCB for BT900-SA to allow the

on-board antenna to radiate and reduce proximity effects due to nearby host PCB GND copper or metal

covers.

BT900-SA on-board antenna datasheet:

http://www.acxc.com.tw/product/at/at3216/AT3216-B2R7HAA_S-R00-N198_2.pdf

Antenna performance on DVK-BT900-V01 Development board is shown below.

Peak gain Avg. gain

XY-plane -2.6 -7.4

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 41 42

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BT 900 Specifications Page 25

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