Thingmagic M6e Manuel d'utilisateur télécharger pdf (Page 27)

Hardware Interfaces

A DIVISION OF TRIMBLE

Hardware Overview 27

Note

The baudrate in the Boot Loader mode depends on whether the module

entered the bootloader mode after a power-up or through an assert or “boot

bootloader” user command. Upon power up if the Reset Line is LOW then the

default baud rate of 115200 will be used. If the module returns to the

bootloader from Application Firmware mode, then the current state and

baudrate will be retained.

USB Interface

Supports USB 2.0 full speed device port (12 Megabits per second) using the two USB

pins (USB_DM and USB_DP).

General Purpose Input/Output (GPIO)

The four GPIO connections, provided through the M6e Digital Connector Signal Definition,

may be configured as inputs or outputs using the MercuryAPI. The GPIO pins connect

through 100 ohm resistors to the high current PA0 to PA3 pins of the AT91SAM7X

processor. The processor data sheet can be consulted for additional details.

Pins configured as inputs must not have input voltages that exceed voltage range of -0.3

volts to +5.5 volts. In addition, during reset the input voltages should not exceed 3.3V.

Outputs may source and sink 16 mA. Voltage drop in the series 100 ohm resistor will

reduce the delivered voltage swing for output loads that draw significant current.

Input Mode

– TTL compatible inputs,

– Logic low < 0.8 V,

– Logic high > 2.0V.

– 5V tolerant

Output Mode

– 3.3 Volt CMOS Logic Output with 100 ohms in series.

– Greater than 1.9 Volts when sourcing 8 mA.

– Greater than 2.9 Volts when sourcing 0.3 mA.

– Less than 1.2 Volts when sinking 8 mA.

– Less than 0.2 Volts when sinking 0.3 mA.

Module power consumption can be adversely affected by incorrect GPIO configuration.

Similarly, the power consumption of external equipment connected to the GPIOs can also

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 99 100

Pas de commentaire

Thingmagic M6e Manuel d'utilisateur Page 27