u-blox LEA-M8S, Руководство по интеграции оборудования

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LEA-M8S / LEA-M8T - Hardware Integration Manual
UBX-13003140 - R07 Production Information Design
Page 9 of 31
2 Design
2.1 Pin description
Function PIN No I/O Description Remarks
Power VCC
6 I Supply Voltage Provide clean and stable supply.
GND
7, 13, 14,
15, 17 - Ground Assure a good
GND
connection to all
GND
pins of the module
VCC_OUT 8 O Output Voltage
(VCC) Leave open if not used.
V_BCKP
11 I Backup Supply
Voltage It is recommended to connect a backup supply voltage to
V_BCKP
in order to enable Warm and Hot Start features on the positioning
modules. Otherwise, connect to
VCC .
VDD_USB
24 I USB Power
Supply To use the USB interface connect this pin to 3.0 – 3.6V.
If no USB serial port used connect to GND.
Antenna RF_IN 16 I GNSS signal
input from
antenna
Use a controlled impedance transmission line of 50
Ω
to connect to
RF_IN.
VCC_RF
18 O Output Voltage
RF section Can be used to power external LNA or an external active antenna
(
VCC_RF connected to V_ANT with 10
Ω
). The max power
consumption of the antenna must not exceed the datasheet
specification of the module.
Leave open if not used.
V_ANT 19 I Antenna Bias
voltage Connect to GND (or leave open) if passive antenna is used. If an
active antenna is used, add a 10
Ω
resistor in front of V_ANT input
to the Antenna Bias Voltage or
VCC_RF
EXTINT1/
AADET_N
20 I Ext. Interrupt
/Active
Antenna Detect Ext. Interrupt Pin. Int. pull-up resistor to VCC./ Input pin for optional
antenna supervisor circuitry. Leave open if not used.
UART TxD (LEA-M8S) 3
TxD / SPI MISO
(LEA-M8T)
O Serial Port Communication interface can be programmed as TX Ready for DDC
interface. Leave open if not used.
O
TxD
SPI MISO
Serial Port if D_SEL =1(or open)
SPI MISO if D_SEL = 0
RxD (LEA-M8S) 4
RxD /SPI MOSI
(LEA-M8T)
I Serial Port
Serial port input with internal pull-up resistor to VCC. Leave open if
not used. Do not use external pull up resistor.
I
RxD
SPI MOSI Serial Port if D_SEL =1(or open)
SPI MOSI if D_SEL = 0
USB USB_DM 25 I/O USB I/O line
USB2.0 bidirectional communication pin. Leave open if unused.
Implementations see section 1.4
USB_DP 26 I/O USB I/O line
System RESET_N 10 I Hardware Reset
(Active Low) Leave open if not used. Do not drive high.
TIMEPULSE 1
28 O Timepulse 1 Configurable Timepulse signal (one pulse per second by default).
Leave open if not used.
SAFEBOOT_N / 12
TIMEPULSE 2
(LEA-M8T)
SAFEBOOT_N (LEA-M8S)
I/O Safeboot_N /
Timepulse 2 Configurable Timepulse signal. Must not be held LO during start-up.
I/O Safeboot_N Must not be held LO during start-up
EXTINT0 27 I Ext. Interrupt Ext. Interrupt Pin. Int. pull-up resistor to VCC . Leave open if unused.
SDA (LEA-M8S) 1
SDA /SPI CS_N
(LEA-M8T)
I/O DDC Pins DDC Data. Leave open if not used.
I/O SDA
SPI CS_N DDC Data if D_SEL =1 (or open)
SPI Chip Select if D_SEL = 0
SCL
(LEA-M8S) 2
SCL / SPI CLK
(LEA-M8T)
I DDC Pins DDC Clock. Leave open if not used.
I/O
SCL
SPI CLK
DDC Clock if D_SEL =1 (or open)
SPI Clock if D_SEL = 0
D_SEL (LEA-M8T) 5 I Interface Select D_SEL = 0 -> SPI, D_SEL =1 (or open) -> DDC