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
20
Americas: +1-800-492-2320
Europe: +44-1628-858-940
Hong Kong: +852 2923 0610
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Other factors that are also related to average current consumption include the
advertising payload bytes in each advertising packet, as well as whether the BT900
is continuously advertising or periodically advertising.
Connection Interval range:
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7.5 ms to 4000 ms in multiples of 1.25 ms.
For a connection event…
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The minimum average current consumption is when the connection interval is large
(around 4000 ms)
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The maximum average current consumption is with the shortest connection interval
of 7.5 ms; no slave latency.
Other factors related to average current consumption include whether transmitting 6 packets
per connection interval and if each packet contains 20 bytes (which is the maximum for each
packet). An inaccurate 32 kHz master clock accuracy would increase the average current
consumption.
Note 5
Average current measurement using a multimeter with averaging performed over 100mS
measurement interval.
Note 6
At 4 MHz clocking, slower throughput.
5
F
UNCTIONAL
D
ESCRIPTION
The BT900 dual mode (BT/BLE) module is a self-contained Bluetooth Low Energy product and requires only
power and a user’s
smart
BASIC application to implement full BLE functionality. The integrated, high
performance antenna combined with the RF and base-band circuitry provides the Bluetooth Low Energy
wireless link, and any of the SIO lines provide the OEM’s chosen interface connection to the sensors. The
user’s
smart
BASIC application binds the sensors to the BLE wireless functionality.
The variety of hardware interfaces and the
smart
BASIC programming language allow the BT900 module to
serve a wide range of wireless applications, while reducing overall time to market and the learning curve for
developing dual-mode BT/ BLE products.
To provide the widest scope for integration, a variety of physical host interfaces/sensors are provided. The
major BT900 series module functional blocks described below.
5.1
Power Management (includes brown-out and power on reset)
Power management features:
System Standby Doze/Deep Sleep modes.
Brownout Reset
Open/Close peripherals (UART, SPI, I2C, SIO’s and ADC) with a command in a smartBASIC application
script
Pin wake-up system from Deep sleep
Power supply features:
Supervisor HW to manage power on reset, brownout (and power fail).
1.8V to 3.6V operating supply range.
