LEA-6 / NEO-6 / MAX-6 - Hardware Integration Manual
UBX-14054794
Production Information
Appendix
Page 74 of 85
The SPI is now running at 870 kHz (against 460 kHz on ANTARIS 4), check that your design supports the
signal path
If you do a redesign, ensure the signal paths of the SPI to support a bandwidth of 4 MHz.
B.4.3
Migration from LEA-5 to LEA-6
For u-blox6 only the Input Voltage thresholds on the pins RXD1 and EXTINT0 have changed.
Be aware, that with u-blox 6 there is no LEA anymore, which supports SPI interface. For SPI consider NEO-6 form
factor.
B.5
Migration of NEO modules
B.5.1
Migration from NEO-4S to NEO-6
For u-blox6 the Input Voltage thresholds on the pins RXD1 and EXTINT0 have changed.
The Safeboot functionality is inverted compared to Antaris receivers.
Also check your power supply requirements with the datasheet (for VCC and VBCKP).
Also check the setting of the configuration pins.
The pin-outs of NEO-4S and NEO-6M/NEO-6Q differ slightly. Table 32 compares the modules and highlights the
differences to be considered.
Pi
n
NEO-4S
NEO-6Q/NEO-6M
Remarks for Migration
Pin Name
Typ. Assignment
Pin Name
Typ. Assignment
1
BOOT_INT
NC
Reserved
NC
Do not drive low.
2
SELECT
VDDIO level I/O;
not connected
SS_N
NC
3
TIMEPULSE
VDDIO level I/O
TIMEPULSE
Output
4
EXTINT0
NC
EXTINT0
NC
5
USB_DM
NC
USB_DM
NC
New serial termination resistors recommended:
22 Ohms
6
USB_DP
NC
USB_DP
NC
7
VDDUSB
Connected to
GND or
VDD_USB
VDDUSB
Connected to
GND or
VDD_USB
Do not leave open. (VDD_USB is 3.3V regulated
power supply from VBUS.)
8
Reserved
NC
Reserved
NC
Pins 8 and 9 must be connected.
9
VCC_RF
VCC-0.1 V
VCC_RF
VCC-0.1 V
No difference
10
GND
GND
GND
GND
No difference
11
RF_IN
RF_IN
RF_IN
RF_IN
No difference
12
GND
GND
GND
GND
No difference
13
GND
GND
GND
GND
No difference
14
MOSI
NC
MOSI/CFG_COM0
NC
The function of the CFG pin has changed. See
section 2.2.3.1 for more details.
15
MISO
NC
MISO/CFG_COM1
NC
16
SCK/
CFG_USB
NC
CFG_GPS0 /SCK
NC
Leave open if not used.
The function of the CFG pin has changed. See
section 2.2.3.1 for more details.
17
NCS
NC
Reserved
NC
No difference
18
Reserved
NC
SDA2
NC
19
Reserved
NC
SCL2
NC
20
TXD1
VDDIO level I/O
TxD1
Output
21
RXD1
VDDIO level I/O
RxD1
Input
Leave open if not used.
22
V_BAT
1.5-3.6 V
V_BCKP
1.4-3.6 V
Wider voltage range but needs more current.
Check your backup supply, regarding the higher
consumption.
23
VCC
2.7-3.3 V
VCC
2.7-3.6 V
Higher peak supply current
24
GND
GND
GND
GND
No difference
Table 32: Pin-out comparison NEO-4S vs. NEO-6
