Ublox MAX-7C-0 Manual

Contents

Ublox MAX-7C-0 Manual Manual pdf 17 page image

MAX-7 / NEO-7 - Hardware Integration ManualUBX-13003704 - R09 Production Information DesignPage 17 of 523.2.1 Minimal design (NEO-7N)Figure 5: NEO-7 passive antenna designFunction PIN No I/O Description RemarksPower VCC 23 I Supply voltage Provide clean and stable supply.GND 10,12,13, 24I Ground Assure a good GND connection to all GND pins of the module,preferably with a large ground plane.V_BCKP 22 I Backup supplyvoltageIt is recommended to connect a backup supply voltage to V_BCKPin order to enable Warm and Hot Start features on the positioningmodules. Otherwise, connect to VCC.VDD_USB 7 I USB powersupplyTo use the USB interface connect this pin to 3.0 – 3.6 V.If no USB serial port used connect to GND.Antenna RF_IN 11 I GPS signal inputfrom antennaThe connection to the antenna has to be routed on the PCB. Use acontrolled impedance of 50  to connect RF_IN to the antenna orthe antenna connector. DC block inside.VCC_RF 9 O Output voltageRF sectionVCC_RF can be used to power an external active antenna.UART TxD 20 O Serial port/SPI MISOCommunication interface, Can be programmed as TX Ready forDDC interface. If pin 2 low => SPI MISO.RxD 21 I Serial port /SPI MOSISerial input. Internal pull-up resistor to VCC. Leave open ifnot used. If pin 2 low => SPI MOSI.USB USB_DM 5 I/O USB I/O line USB bidirectional communication pin. Leave open if unused.Implementations see section 2.6.2.USB_DP 6 I/O USB I/O lineSystem TIMEPULSE 3 O Time pulsesignalConfigurable time pulse signal (one pulse per second by default).Leave open if not used.EXTINT 4 I ExternalinterruptExternal Interrupt pin.Internal pull-up resistor to VCC. Leave open if not used.SDA 18 I/O DDC data /SPI CS_NDDC DataIf pin 2 low => SPI chip select.SCL 19 I DDC clock /SPI SCKDDC Clock. If pin 2 low => SPI clock.ANT_ON (NEO-7N)RESERVED (NEO-7M)14 O ANT_ON ANT_ON (antenna on) HIGH can be used to turn on and LOW toturn off an optional external LNA.- Reserved Reserved, leave open.RESET_N 8 I Reset input Reset inputD_SEL 2 I selects theinterfaceUsed to select UART/DDC or SPIOpen = UART/DDC; low = SPIRESERVED 1, 15,16, 17- Reserved Leave open.Table 4: Pinout NEO-7