www.lairdtech.com/bluetooth
20
© Copyright 2018 Laird. All Rights Reserved
Americas: +1-800-492-2320
Europe: +44-1628-858-940
Hong Kong: +852 2923 0610
Tying nAutoRUN HIGH (to net name on devboard VDD_VSRC_nRF) inhibits the $autorun$ application from running. As an
alternative to using USB_DTR, the J12 three-pin header allows a jumper to be fitted to select between the two operating
modes.
Table 5: BL654 nAutoRUN header
nAutoRUN
Pin
BL654 Operating Mode (pin28, nAutoRUN Mode/SIO_35)
Interactive/
Development Mode
(SIO_35 set High
Externally)
Self-contained Run
Mode (nAutoRUN
mode)
(SIO_35 Low
Internally)
Circuit
J12
Jumper
Position
Develop
Jumper on J12 pins 2-1
nAutoRUN (default)
Jumper on J12 pins 2-3
BL654 has internal
pull-down enabled,
jumper in J12 in 2-3
can also be left off
The J12 header connector allows the USB_DTR signal from the FTDI chip to be disconnected from the BL654.
To connect the BL654 nAutoRUN pin SIO_35 (pin 5) to PC FTDI USB_DTR line via the J12 header connector, do the following:
▪
Fit the jumper into the J12 (pin 2-1) header connector to allow the PC (using UwTerminal) to control nAutoRUN pin
(SIO_35).
To disconnect the BL654 nAutoRUN SIO_35 (pin 5) from the PC FTDI USB_DTR line, do the following:
▪
Remove the jumper on header connector J12 pin 2-1. Then nAutoRUN can be controlled by inserting the jumper onto
J12 (pin 2-3) as shown in
Table 5
(this is the default). The BL654 by default has pull-down enabled on the SIO_35
(nAutoRUN) pin, so the jumper into J12 (pin 2-3) is optional.
The Over-the-Air (OTA) feature makes it possible to download
smart
BASIC applications over the air to the BL654. To enable
this feature, SIO_02 must be pulled high externally.
On the development board, header connector J5-pin1 brings out the BL654 SIO_02; J5-pin 2 brings out VCC_nRF_SW. To
pull BL654 SIO_02 high (to net name VCC_nRF_SW on devboard), fit jumper into header J5.
Note:
When SIO_02 is high, ensure that SIO_35 (nAutoRun) is NOT high at same time, otherwise you cannot load the
smart
BASIC application script.
This section discusses Virtual Serial Port (VSP) Command mode through pulling SIO_02 high and nAutoRUN (SIO_35) low.
Refer to the documentation tab of the
BL654 product page:
http://www.lairdtech.com/products/bl654-ble-thread-nfc-modules
.
Figure 13
shows the difference between VSP Bridge to UART mode and VSP Command mode and how SIO
_02
and
nAutoRUN (SIO_35) must be configured to select between these two modes.
R25
NOPOP (10K)
USB_DTR
GND
VDD_VSRC_nRF
PIN HEADER,2.54mm 1X3P
J12
1
1
2
2
3
3
n_Autorun /
module_DSR
Module_DSR
Develop: Jumper J12 pin2-1 (default)
nAUTORUN: Jumper J12 pin2-3
SIO_35
Summary of Contents for BL654
Page 1: ...Version 1 1 ...
