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32
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There is an optional external serial QSPI flash IC (U18) that may be used, for example, for data logging purposes. U18 can
also capable of SPI mode.
Solder bridges SB4, SB5, SB6, SB7, SB10 and SB11 must individually be shorted to connect this optional external serial
(QSPI) flash (U18 to the BL654PA module).
By default, these BL644 pins are GPIO pins.
Figure 20: Optional external serial SPI flash IC (U18) schematic and PCB
shows the U18 pin mapping to BL654PA SIO pin mapping (via open solder bridges).
Table 15: U18 SPI or QSPI flashc IC pin mapping to BL654PA GPIO mappings
BL654PA Pin (Pin Name)
U18 Pin (QSPI flash IC)
and Pin Name
Via Open Solder bridge
Pin 16 (SIO_17/QSPI_CS)
Pin 1 CS#
SB7
BL654PA Dev board R126 10K pull-up on,
therefore by default, device not selected.
Drive from BL654PA line low to select.
Pin 14 (SIO_19/QSPI_CLK)
Pin 6 SCLK
SB4
Pin 13 (SIO_20/QSPI_DIO0)
Pin 5 SIO_0/SI
SB5
Pin 12 (SIO_21/QSPI_DIO1)
Pin 2 SIO_1/SO
SB6
Pin 11 (SIO_22/QSPI_DIO2)
Pin 3 SIO_2/WP#
SB11
Pin 9 (SIO_23/QSPI_DIO3)
Pin 7 SIO_3/HOLD#
SB10
The
smart
BASIC application for this external optional serial QSPI flash IC will be available in the future in the GitHub
smart
BASIC sample application repository:
https://github.com/LairdCP/BL654PA-Applications
SB5 NOPOP (Solderbridge_Open)
1
1
2
2
SB11
NOPOP (Solderbridge_Open)
1
1
2
2
GND
QSPI_CLK
SB4 NOPOP (Solderbridge_Open)
1
1
2
2
SB10 NOPOP (Solderbridge_Open)
1
1
2
2
QSPI_DIO3
SIO_22
SIO_20
SIO_19
SIO_23
GND
QSPI_DIO2
VDD_VSRC_nRF
VDD_VSRC_nRF
QSPI_DIO0
R126
10K
QSPI_CS#
QSPI_DIO1
U18
4Mx1,SPI,1.65~3.6V
CS#
1
SO/SIO1
2
WP#
3
GND
4
SI/SIO0
5
CLK
6
HOLD#
7
VCC
8
GN
D
9
SB6
NOPOP (Solderbridge_Open)
1
1
2
2
SB7
NOPOP (Solderbridge_Open)
1
1
2
2
SIO_17
SIO_21
C5
0.1uF,16V
GND
Summary of Contents for BL654PA
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