u-blox LEA-5 Series - Migration from NEO-4 S to NEO-5 Q;NEO-5 M

LEA-5, NEO-5, TIM-5H - Hardware Integration Manual
GPS.G5-MS5-09027-A2 Released Appendix
Page 64 of 68
A.5 Migration from NEO-4S to NEO-5Q/NEO-5M
The pin-outs of NEO-4S and NEO-5M/NEO-5Q differ slightly. Table 18 compares the modules and highlights the
differences to be considered.
Pin
NEO-4S
NEO-5Q/NEO-5M
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
NC/
SS_N
NC
NEO-5M: NC
NEO-5Q: SS_N
3
TIMEPULSE
VDDIO level I/O
TIMEPULSE
Output
4
EXTINT0
NC
EXTINT0
NC
5
USB_DM
NC
USB_DM
NC
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-0.1V
VCC_RF
VCC-0.1V
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 2.3 for more details.
15
MISO
NC
MISO//CFG_COM1/
NC
NC
16
SCK/
CFG_USB
RF_IN
SCK/CFG_GPS0/
NC
NC
Leave open if not used.
The function of the CFG pin has changed. See
Section 2.3 for more details.
17
NCS
NC
SCS1_N/
NC
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
1.5-3.6V
V_BCKP
1.4-3.6V
Wider voltage range but needs more current.
Check your backup supply, regarding the higher
consumption.
23
VCC
2.7-3.3V
VCC
2.7-3.6V
Higher peak supply current
24
GND
GND
GND
GND
No difference
: Pins to be checked carefully; NC: Not connected
Table 18: Pin-out comparison NEO-4S vs. NEO-5