BT 900 Specifications download pdf (Page 21)

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

The integrated high accuracy 26 MHz (+/-10 ppm) crystal oscillator helps with Radio operation and also helps

reduce power consumption in the Active modes.

5.2.2 Timers

In keeping with the event driven paradigm of

smart

BASIC, the timer subsystem enables the writing of

smart

BASIC which allows the generation of future events based on timeouts.

 Regular Timer – There are eight built-in timers (regular timer) derived from a single multifunction timer

clock which are controlled solely by

smart

BASIC functions. The resolution of the regular timer is

dependent on the selected system clock frequency can be obtained from Table 10.

Table 10: System Clock and Tick Count Period

System Clock (MHz)

Tick Count Period (uS)

40 6.4

20 12.8

4 64

 Tick Timer – This is a 31-bit free running counter that increments every one millisecond. The resolution

of this counter is dependent on the selected system clock frequency and can be obtained from Table 10.

Refer to the

smart

BASIC User Manual for more information.

5.3 Memory for

smart

BASIC Application Code and Data

Up to approximately 48 Kb of data memory is available for the

smart

BASIC application script and up to 4 Kb is

available for data.

5.4 RF

 2402–2480 MHz Bluetooth 4.0 Dual Mode (BT and BLE); 1 Mbps to 3 Mbps over the air data rate.

 TX output power of +8 dBm programmable (via

smart

BASIC command) to -20 dBm in steps of four dB.

 Receiver (with integrated channel filters) to achieve maximum sensitivity -90 dBm @ 1 Mbps BLE or

Classic BT, 2 Mbps, 3 Mbps).

 RF conducted interface available in 2-ways:

- BT900-SA: RF connected to on-board antenna on the BT900-SA

- BT900-SC: RF connected to on-board uFL RF connector on the BT900-SC

 Antenna options:

- Integrated monopole chip antenna on the BT900-SA

- External dipole antenna connected with to uFL RF connector on the BT900-SC.

5.5 UART Interface

The Universal Asynchronous Receiver/Transmitter (UART) offers fast, full-duplex, asynchronous serial

communication with built-in flow control support (UART_CTS, UART_RTS) in hardware up to 2 Mbps baud. No

parity checking, 8 data bits, and 1 stop bit are supported.

UART_TX, UART_RX, UART_RTS, and UART_CTS form a conventional asynchronous serial data port with

handshaking. The interface is designed to operate correctly when connected to other UART devices such as

the 16550A. The signalling levels are nominal 0 V and 3.3 V (tracks VCC) and are inverted with respect to the

signalling on an RS232 cable.

Two-way hardware flow control is implemented by UART_RTS and UART_CTS. UART_RTS is an output and

UART_CTS is an input. Both are active low.

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BT 900 Specifications Page 21

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