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IMU383 Series User's Manual
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2.1.2
Power Input and Power Input Ground
Power is applied to the unit on pins 10 through 15. Pins 13-15 are ground; Pins 10-12 accepts 3
to 5 VDC unregulated input. Note that these are redundant power ground input pairs.
WARNING
Do not reverse the power leads or damage may occur. Do not add greater than 5.5 volts on the
power pins or damage may occur. This system has no reverse voltage or over-voltage protection.
2.1.3
Serial Data Interface
The user can select the serial interface used with the unit by controlling the logic level on
connector pin 7 at system startup. If pin 7 is left floating then the unit is configured for SPI
communications on pins 3-6. Pin 7 is set as an output and used as the DATA READY discrete
for SPI communications. Additionally, the user can synchronize the output data on the SPI port
by providing a 1 kHz input pulse on Pin 2. For the complete SPI interface definition, please refer
to Section 4.
If the connector pin 7 is grounded then the unit is configured for low-level UART output on pins
3 and 4. This is a standard UART asynchronous output data port. For the complete UART
interface definition, please refer to Sections 5-8. Note that the two output port interface methods
are controlled independently from each other. The UART port output controls apply only to data
being output over the UART port, and the SPI output controls apply only to data being output
over the SPI port.
Doc# 7430-1398-01
External Reset (NRST)
Reserved – factory use only
Power VIN (3-5 VDC)
Power VIN (3-5 VDC)
Power VIN (3-5 VDC)
Power GND
Power GND
Power GND
Reserved – factory use only
Reserved
Reserved – factory use only
Reserved
Reserved – factory use only
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