Baseband Technologies Inc.
Title: Stamp-size Ultra Low-Power GPS Receiver Module User Guide Rev 1.0
Page 5
The IC on the bottom side, U3, is the MAX14690 Power Management IC (PMIC). This IC contains
several regulators which provide voltages required by other components. It also automatically
detects when 5V is being received.
There are two 6-pin headers to interface with the Stamp Module.
The UART header (J5) is intended to connect the Stamp Module to a UART port. During the initial
testing phase, customers are advised to connect the Stamp Module to a PC using a FTDI or similar
device with 3.3V I/O. A suitable FTDI device is made by SparkFun Electronics and can be purchased
at Digikey
https://www.digikey.ca/en/products/detail/sparkfun-electronics/BOB-13263/7675364
.
IMPORTANT NOTES
The UART I/O voltage must be 1.8V to 3.3V.
The pin-out of the UART header is:
Pin-1: RTS
Pin-2: GND
Pin-3: CTS
Pin-4: RX
Pin-5: GND
Pin-6: TX
The PWR header (J4) is a multi-purpose connector.
Pin-1 (GND), Pin-3 (GND) and Pin-4 (5V) supplies power to the Stamp Module.
Pin-2 (\RESET) is hardware reset. When Pin-2 is pulled low briefly, the Stamp Module will perform
a hardware reset that is equivalent to turning the power ON/OFF.
Pin-5 (PWRSW) serves as an ON/OFF switch to the Stamp Module when Pin-6 (BAT) is connected
to an optional rechargeable battery and is not powered by Pin-4 (5V).
To turn ON the Stamp Module, pull Pin-5 (PWRSW) low briefly.
To turn OFF the Stamp Module, pull Pin-5 (PWRSW) low for 12 seconds or more. This will
shutdown the Stamp Module completely and RTC time will be lost.
To control when the Stamp Module is awake or asleep, use the @WAKE command and the WAKE
pin (Pin-1 one the of the PGM/I2C header (J3)) (refer to section 4.1 for further detail). If the WAKE
pin is not connected, the Stamp Module will remain in the wake state.
