Revision 1.1
7
DIGITAL I/O INTERFACE
Connection to target electronics is made a 40-pin connector (JP3), however only 26 pins of the
connector are used by the DLP-IO16.
Pin Number
Description
1
External Reset for the USB interface (input)
2
Target Microprocessor Reset (active high)(output)
3
USB Port Ground
4
USB Port VCC
13, 14, 24
Switched Ground
23
Switched Vcc
25
SLEEP# USB Standby Indicator
26
SW2 Test Switch
5,6,7,8,9,10,11,12
Digital Outputs
15,16,17,18,19,20,21,22
Digital Inputs
The External reset pin (pin 1) can be used by the target electronics to reset the USB interface on
the DLP-IO16. The target microcontroller reset signal (pin 2) is made available such that target
electronics can also be held in the reset state, if desired, during the firmware download process.
Five-volt power is made available for target electronics but care must be taken to not exceed a
total of 500mA drawn from the USB port.
The SW2 signal can be used by target electronics as a control signal (jumper JP2 removed) or
read by the DLP-IO16 via U11.
