SEPTENTRIO AsteRx-m Series, Руководство по оборудованию

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AsteRx-m OEM
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27 LOGLED O LVTTL Internal logging status indicator, see Appendix A. Leave unconnected if not used. Max output
current: 8mA.
29 GND Gnd 0 Ground. All ground pins must be connected.
Pin# Name Type Level Description Connection Tips
2 Vin
P 3.3V
+/-5% Main power supply input Both Vin pins (pin#1 and pin#2) must be tied
together.
4 GND Gnd 0 Ground. All ground pins must be connected.
6 USB_D- I/O USB USB data signal negative D-. Leave unconnected if USB not used.
8 nRST I, PU LVTTL Reset input, active negative. Receiver resets when driven low. Leave unconnected if not used.
10 RX1 I LVTTL Serial COM 1 receive line (inactive state is high). Pull up to 3.3V if not used.
12 PPSout O LVTTL PPS output. Polarity and rate user selectable. See Firmware User
Manual for operation instructions. Pulse duration: 3ms. Leave unconnected if not used.
14 RX2 I LVTTL Serial COM 2 receive line (inactive state is high). Pull up to 3.3V if not used.
16 RX3 I LVTTL Serial COM 3 receive line (inactive state is high). Pull up to 3.3V if not used.
18 VANT P 0<
VANT
< 6V Antenna supply, max current per antenna 200mA. The voltage
provided on this pin is tranferred to the central conductor of the
two antenna connectors. Typically tie to Vin pins to provide a 3.3V
voltage to the antenna.
20 nPDN I, PU LVTTL Receiver is shut down (low power mode) when driven low. It is
recommended to keep nPDN low for at least 5 seconds to ensure
complete power-down.
This functionality is not available on old board revisions.
See section 2.8 for details.
Leave unconnected if not used.
See section 2.8 if you need to implement the
nPDN functionality on GRB00231000AB03xx
or GRB00231000AB04xx.
22
GPLED
O LVTTL General purpose LED, see Appendix A. Leave unconnected if not used. Max output
current: 8mA.
24 SPI1_nCS0 O LVTTL SPI1 chip select. Can be connected to an external SD memory
card, see section 2.7. Leave unconnected if not used.
26 SPI1_SCK O LVTTL SPI1 clock. Can be connected to an external SD memory card, see
section 2.7 Leave unconnected if not used.
28 SPI1_MOSI O LVTTL SPI1 MOSI. Can be connected to an external SD memory card, see
section 2.7 Leave unconnected if not used.
30 SPI1_MISO I LVTTL SPI1 MISO. Can be connected to an external SD memory card, see
section 2.7 Leave unconnected if not used.
2.7 SD Memory Card Usage
The receiver can interface to an external SD memory card through pins 24, 26, 28 and
30. The recommended circuit to a 9-pin SD memory card socket is shown below.