u-blox MAX-7 Series, Hardware Integration Manual

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MAX-7 / NEO-7 / LEA-7 - Hardware Integration Manual
GPS.G7-HW-11006-1 Hardware description
Page 14 of 55
2.7.3 D_SEL: Interface select (NEO-7)
The
D_SEL
Pin available on all NEO-7 Modules selects the available interfaces. SPI cannot be used simultaneously
with UART/DDC.
If open, UART and DDC are available. If pulled low, these pins are SPI Interface.
Pin NEO-7 Pin 2 D_SEL open NEO-7 Pin 2 D_SEL low
18 DDC Data SPI CS_N
19 DDC Clock SPI SCK
20 TxD SPI MISO
21 RxD SPI MOSI
Table 3: pin 2 D_SEL on NEO-7
2.7.4 TX-ready signal
The TX-ready signal indicates that the receiver has data to transmit. A listener can wait on the TX-ready signal
instead of polling the DDC or SPI interfaces. The UBX-CFG-PRT message lets you configure the polarity and the
number of bytes in the buffer before the TX-ready signal goes active. The TX-ready signal can be mapped to
UART TXD (PIO 06). The TX-ready function is disabled by default.
u-blox wireless modules (LEON FW 07.70 and LISA-U2 01S onwards) configure and enable the TX-ready
functionality automatically. This is not supported by LEON FW7.60.02 and previous versions.
For more information on configuration and remap of this pin, see the u-blox 7 Receiver Description including
Protocol Specification [4] and GPS Implementation and Aiding Features in u-blox wireless modules [10].
2.7.5 ANT_ON: Antenna ON (LNA enable) (NEO-7N, MAX-7Q, MAX-7C)
In Power Save Mode, the system can turn on/off an optional external LNA using the ANT_ON signal in order to
optimize power consumption.
2.7.6 Antenna Short circuit detection (LEA-7N, MAX-7W)
LEA-7N and MAX-7W modules include internal short circuit antenna detection. For more information, see
section 3.4.3.2.
2.7.7 Antenna open circuit detection
2.7.7.1 Antenna open circuit detection (LEA-7N)
LEA-7N modules provide antenna open circuit detection (OCD) functionality over the
AADET_N
pin.
AADET_N is an input pin used to report whether an external circuit has detected an external antenna or not.
Low means an antenna has been detected, while high means no external antenna has been detected. This
functionality is by default disabled.
2.7.7.2 Antenna open circuit detection (MAX-7)
Antenna open circuit detection (OCD) is not activated by default on the MAX-7 module. OCD can be mapped to
PIO13 (EXTINT). For more information about how to implement OCD, see section
3.4.3.3 . To learn how to
configure OCD see the u-blox 7 Receiver Description including Protocol Specification [4].
2.7.8 TIMEPULSE
A configurable time pulse signal is available with all u-blox 7 modules. By default, the time pulse signal is
configured to 1 pulse per second. For more information see the
u-blox 7 Receiver Description including Protocol
Specification [4]
.