User's Manual

BT900-Sx Hardware Integration Guide
Intelligent BTv4.0 Dual Mode Module
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28 CONN-HIG-BT900
(upto xMHz
)and the Duty cycle can be set over range from 0% to 100% (both configurable by
smart BASIC command). Note, the frequency driving each of the x SIO pins is the same but the
duty cycle can be independently set for each pin.
FREQ output signal frequency can be set over a range of 0Hz to xMHz (with 50% mark-space
ratio).
5.9 nRESET pin
Table 18: nRESET pin
Signal Name
Pin No
I/O
Comments
nRESET
16
I
BT900
HW reset (active low
)
.
Pull the nRESET pin low for
minimum 100mS in order for the BT900 to reset.
5.10 nAutoRUN pin
Refer to section nAutoRUN pin and Operating Modes regarding operating modes and the
nAutoRUN pin.
 Self-contained Run mode
 Interactive / Development mode
5.11 smart BASIC runtime engine firmware upgrade
The BT900 SW consists of:
 BT900 smartBASIC runtime engine FW (loaded at production, may be upgraded customer).
 BT900 smartBASIC application script developed by customer (loaded through UART by
customer).
To allow customer the capability to upgrade the BT900 smartBASIC runtime engine FW, to the
latest version released from Laird), the current smartBASIC runtime engine firmware (v9.x.y.z) only
allows this upgrade via the UART.
Figure 8:
5.12 BT900-SA on-board chip antenna characteristics
The BT900-SA on-board chip monopole antenna radiated performance depends on the host PCB
layout.
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.