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NAVSYNC CW25 User Manual
Also see for CW25: User manual
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CW25 Software User Manual Page 14 of 50 Rev 03 Date: 06/16/08Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.4.5 I/O Signals continuedEVENT_IN Type: I/O Direction: Input/Output Pin: 37The event input signal. This is normally an event timer or counter. Events are timed againstGPS time. Under software control, this input can be used as an external 48 MHz input for theUSB interface or this input can also be used for general purpose I/O. The signal return pathis DIG_GND.N2WCK Type: I/O Direction: Input/Output Pin: 28The NavSync 2 Wire Clock signal. This is the open collector I 2 C compatible clock signal forthe 2 wire serial interface. The signal return path is DIG_GND. 4N2WDA Type: I/O Direction: Input/Output Pin: 29The NavSync 2 Wire Data signal. This is the open collector I2C compatible data signal for the2 wire serial interface. The signal return path is DIG_GND. 4USBP Type: I/O Direction: Input/Output Pin: 30The positive USB signal. The signal return path is DIG_GND. 5USBN Type: I/O Direction: Input/Output Pin: 31The negative USB signal. The signal return path is DIG_GND. 5LED_RED Type: I/O Direction: Output Pin: 8This is a dual function signal. Normally this signal is used to drive a red LED. Standardsoftware builds use this signal to indicate GPS status. In special software builds, this signalcan be used as GPIO. This signal has a 3.3V CMOS drive. A series limiting resistor isrequired to limit output current to ±5mA (typically 270 ohms).The signal return path is DIG_GND.LED_GRN Type: I/O Direction: Output Pin: 9This is a dual function signal. Normally this signal is used to drive a green LED. Standardsoftware builds use this signal to indicate GPS status. In special software builds, this signalcan be used as GPIO. This signal has a 3.3V CMOS drive. A series limiting resistor isrequired to limit output current to ±5mA (typically 270 ohms).The signal return path is DIG_GND.GPIO[0]/PWM Type: I/O Direction: Input/Output Pin: 39Normally the GPIO[0]/PWM output provides a Frequency Output that defaults to 10 MHz, and isuser configurable from 10 Hz to 30 MHz signal. The output is enabled on power-up and issteered by the GPS solution. Custom software versions can also configure this pin forgeneral I/O, PWM or EPOCH output. The signal return path is DIG_GND.GPIO[1]/TIME_SYNC Type: I/O Direction: Input/Output Pin: 40The GPIO[1]/TIME_SYNC pin provides a synchronization pulse generated by the onboardRTC. Custom software versions can also configure this pin for general pupose I/O, or anadditional PPS output. The signal return path is DIG_GND.GPIO[2]/NEXT_INT Type: I/O Direction: Input/Output Pin: 41The GPIO[2]/NEXT_INT output provides an active high status indicator for the FrequencyOutput available on pin 39 (GPIO[0]/PWM). Custom software versions can also configure thispin for general pupose I/O. The signal return path is DIG_GND.GPIO[3]/FREQ_IN Type: I/O Direction: Input/Output Pin: 42The GPIO[3]/FREQ_IN output provides an activehigh status 3D fix indicator. This indicatorcan also be used to determine the validity of the pin 38 (1PPS) output. The signal returnpath is DIG_GND.Notes4. Accessible with custom software only.5. USB is not supported in the current software build. Leave these two pins unconnected.4. SIGNAL DESCRIPTION continued |
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