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1. Introducing of GPS MAX EASY

GPS MAX EASY or ATC-E22 is one of AT-COM's Easy Board product series. The product uses GPS MAX-8/MAX-M8 series module of UBLOX. The MAX-8/MAX-M8 series of standard precision GNSS modules features the reliable performance of the u-blox 8 positioning engine, which receives GPS, GLONASS, QZSS and SBAS signals. The MAX-8/MAX-M8 series delivers high sensitivity and minimal acquisition times in the ultra-compact MAX form factor.

2. Schematic

3. Feature

Module ATC-E22

ATCBus is a data bus that connects multiple hardware together, making it easier to research and use. "Plug-and-Play" with extremely compact size. It is suitable for most current protocols of electronic products. That's why AT-COM engineers can connect many applications of multiple hardware together easily. And at AT-COM we call it ATCBus.

Notable things in ATCBus of ATC-E22:

• The communication voltage at the IO pin of ATC-Bus depends on the jump voltage selection resistor.
• The power supply for the board is up to 5.5V and when powered, the MAX-8/MAX-M8 module of U-blox will default to Power On and led PWR always bright.

Max-8/ Max-M8 operates at 1.65 ~ 3.3V voltage range, with GPS MAX EASY product, the module is designed to operate at 3V voltage as recommended by the manufacturer to ensure the module works properly. with the LDO IC HTC's TJ62FP30GSF provides power up to 250mA.

- The main power supply for the module is 5V, via 5V and GND pins of ATCBus.

- The LDO IC TJ62FP30GSF ADJ is powered by a 5V power supply, producing a 3V voltage, the 250mA current is supplied to the active device.

Some feature of TJ62FP30GSF

• Input Operating Voltage Range: 2.5V to 10V
• 1µA typical Quiescent Current
• ±2% Output Voltage Accuracy
• Stable with 1µF MLCC
• Output current up to 250mA
• Over current protection
• Moisture sensitivity level 3

Logic Voltage Selection

To communicate with external devices with logic 5V/3V, the board has a interface with 3.3V/5V logic voltage selection for user can choose depend their application. When manufacturing, the default logic voltage is 5V logic level.

ATC-E22 uses bidirectional logic translator TXS0108EPW of Texas Instruments, it can use to convert logic level from 1.2~3.6V to 1.65~5.5V and directions with speed up to 100Mbps. Logic level of microcontroller normal is 3.3V/5V, so voltage translator IC need to use to compatible signal level.

How to change the communication voltage:

• Remove the 0R resistor (size 0603) at the unwanted position.
• Solder the 0R resistor (size 0603) to the desired position of 3.3V or 5V.