Name: Ultimate GPS GNSS with USB - 99 channel w/10 Hz updates
Brand: Adafruit
SKU: 4279

Logical pinout · physical placement not verified

VIN
Power input for the GPS breakout, source states connect to a clean 3-5VDC supply.
Type · PowerVoltage · 3-5VDC input
GND
Power and signal ground, connect to power supply and microcontroller ground.
Type · GroundVoltage · 0V
VBAT
Optional RTC battery-backup input for the GPS real time clock battery backup.
Type · PowerVoltage · Under 3.3V battery input per source note
EN
Enable pin pulled high with 10K; pulling to ground turns off the GPS module.
Type · Control
3.3V
Output from the onboard 3.3V regulator, source states it can provide at least 100mA.
Type · PowerVoltage · 3.3V output, at least 100mA
TX
Serial data transmitted from the GPS module to a microcontroller or computer; default 9600 baud.
Type · UARTVoltage · 3.3V logic output
RX
Serial data input to the GPS; source states 3.3V or 5V logic is accepted via level shifter, default 9600 baud.
Type · UARTVoltage · 3.3V or 5V logic input accepted
FIX
Fix-status output shared with the red LED; pulses once per second with no fix, mostly low with a brief pulse every 15 seconds when fixed.
Type · UnknownVoltage · 0V low, pulses high per source
PPS
Pulse-per-second output on V3 modules; mostly logic low and pulses high once per second for 50-100ms.
Type · UnknownVoltage · 3.3V pulse output

Pin	Type	Function	Voltage
VIN	Power	Power input for the GPS breakout, source states connect to a clean 3-5VDC supply.	3-5VDC input
GND	Ground	Power and signal ground, connect to power supply and microcontroller ground.	0V
VBAT	Power	Optional RTC battery-backup input for the GPS real time clock battery backup.	Under 3.3V battery input per source note
EN	Control	Enable pin pulled high with 10K; pulling to ground turns off the GPS module.
3.3V	Power	Output from the onboard 3.3V regulator, source states it can provide at least 100mA.	3.3V output, at least 100mA
TX	UART	Serial data transmitted from the GPS module to a microcontroller or computer; default 9600 baud.	3.3V logic output
RX	UART	Serial data input to the GPS; source states 3.3V or 5V logic is accepted via level shifter, default 9600 baud.	3.3V or 5V logic input accepted
FIX	Unknown	Fix-status output shared with the red LED; pulses once per second with no fix, mostly low with a brief pulse every 15 seconds when fixed.	0V low, pulses high per source
PPS	Unknown	Pulse-per-second output on V3 modules; mostly logic low and pulses high once per second for 50-100ms.	3.3V pulse output

Logical pinout · physical placement not verified

Pin details

9 connections

VIN
Power input for the GPS breakout, source states connect to a clean 3-5VDC supply.
PowerVoltage · 3-5VDC input
GND
Power and signal ground, connect to power supply and microcontroller ground.
GroundVoltage · 0V
VBAT
Optional RTC battery-backup input for the GPS real time clock battery backup.
PowerVoltage · Under 3.3V battery input per source note
EN
Enable pin pulled high with 10K; pulling to ground turns off the GPS module.
Control
3.3V
Output from the onboard 3.3V regulator, source states it can provide at least 100mA.
PowerVoltage · 3.3V output, at least 100mA
TX
Serial data transmitted from the GPS module to a microcontroller or computer; default 9600 baud.
UARTVoltage · 3.3V logic output
RX
Serial data input to the GPS; source states 3.3V or 5V logic is accepted via level shifter, default 9600 baud.
UARTVoltage · 3.3V or 5V logic input accepted
FIX
Fix-status output shared with the red LED; pulses once per second with no fix, mostly low with a brief pulse every 15 seconds when fixed.
UnknownVoltage · 0V low, pulses high per source
PPS
Pulse-per-second output on V3 modules; mostly logic low and pulses high once per second for 50-100ms.
UnknownVoltage · 3.3V pulse output

Start wiring

UART · I2C · USB · 3.3 – 5 V · Breakout

Verify supply voltage and logic levels before powering up.

Module pins: VIN, VBAT, 3.3V, GND, TX, RX. Schematik maps them to your board in the app.

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