Interlink-electronics VersaPad USB Manual de usuario descargar pdf (Pagina 18)

USB

ersaPad®

Integration Guide

www.interlinkelectronics.com

7.0 USB Information

Communication from the host to the microprocessor is done via USB and:

 Uses the low speed USB standard

 Is compatible with any USB 1.1 or 2.0 host

 Enumerates as a HID device

 Uses the standard Windows mouse driver

The microprocessor reports data to the host at a rate of 50 reports/sec.

7.1 Device PID and VID

 IC’s Product ID (PID): 0x0001

 Interlink Electronics’ Vendor ID (VID): 0x214A

7.2 Data Packet

The data packet from the chip is organized as.

 Byte 0

o Bit 0 is the Left Button status

o Bit 1 is the Right Button status

o Bit 2 is the Middle button status

 Byte 1 reports the X direction. The values range from -127 to +127 counts.

 Byte 2 reports the Y direction. The values range from -127 to +127 counts.

7.3 USB Suspend Mode

The module will respond to suspend command from the host by entering ‘sleep mode’ until

awakened by the host. While in suspend mode, the chip will go into a low current draw

mode.

7.4 Operating Voltage and Current

The USB VersaPad is bus powered; therefore, it operates at 5V. Under normal operation,

the device draws approximately 15mA. During suspend mode the chip enters a low current

mode. In this mode the chip will draw no more than 25nA.

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Interlink-electronics VersaPad USB Manual de usuario Pagina 18