NXP Semiconductors QorIQ LS1028A, Reference Manual, Page: 42 / 112

an SPI based module can be supported simultaneously on mikroBUS 1 and 2 sockets, or vice-versa. I2C on both the modules
can be accessed instantaneously from the I2C mux. For more information on I2C mux selection, refer
I2C interface on page 34.
The following figure shows the mikroBUS architecture.
LS 1028A
SPI3_SOUT,
SPI3_SIN,
SPI3_PCS,
SPI3_SCK
OVDD
(1.8V)
B LE Module
B LE-P-Click
B E E Module
B E E-Click
NFC Module
NFC-Click
Level
Translator
1.8V>3.3V
CLKOUT/
FTM1_CH1
UART2_SOUT/SIN
I2C_CH6/CH7
uCLICK2_SPI
uCLICK2_PWM
uCLICK2_UART
uCLICK1_SPI
uCLICK1_PWM
uCLICK1_UART
I2C1_CH6
I2C1_CH7
From UART2
MUX
From I2C MUX
CFG_MUX_uBUS1/2_SPI_B,
CFG_MUX_uBUS1/2_UART_B,
CFG_MUX_uBUS1/2_PWM_B
CPLD
RESET
INT
MUX
CTL
Figure 21. mikroBUS architecture
The following table describes some of the mikro-click modules (boards) that can be used on the mikroBUS sockets.
Table 20. Mikro-click modules
Module Communication interface Part number Description
BLE module
BLE P Click
SPI MIKROE-1597 Module supports Bluetooth
4.0 on the board. This module
communicates with
LS1028ARDB through SPI
(CS, SCK, MISO, MOSI), INT
(RDY) and AN (ACT) lines on
mikroBUS socket.
BEE module
BEE click
SPI MIKROE-987 Module features a 2.4 GHz
IEEE 802.15.4 radio
transceiver module to support
wireless communication
applications.
NFC module
NFC click
I2C, GPIO MIKROE-2395 It is a near field
communications (NFC)
controller from NXP.
The LS1028A processor supports serial peripheral interface (SPI3) controller. The SPI3 pins are used to access the two mikroBUS
sockets connected on the board. However, only one mikroBUS connector can be used at a time as SPI3 supports only one chip
select.
The UART2 interface can be used to communicate either with mikro-click modules or with RS232 compliant devices using the
LTC2804-1 transceiver. The selection is done through a mux which is controlled through the CFG_MUX_UART2_SEL0 signal by
CPLD.
LS1028ARDB Functional Description
QorIQ LS1028A Reference Design Board Reference Manual, Rev. b, 11/2018
42
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