Garmin GPS 15L Technical Specifications

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Garmin GPS 15L Technical Specifications Manual pdf 12 page image

190-00266-01 GPS 15H & 15L Technical Specifications Rev. DPage 82 GPS 15H & 15L WIRE DESCRIPTIONS AND WIRING DIAGRAMSThe GPS 15H-F & 15L-F use an eight-contact flex circuit LIF (low insertion force) connector. The GPS15H-W & 15L-W use an eight-pin JST connector (mating wire harness included). See section 1.5.1.3.2.1 GPS 15H & 15L WIRE DESCRIPTIONSPin # Signal Name Description1 BACKUPPOWERThis input provides external power to maintain the real-time clock. This enablesthe user to provide backup power if needed for longer than the on-board backupbattery provides (roughly 21 days). Input voltage must be between +2.8 and +3.4VDC.2 GROUND Power and Signal Ground3 POWER GPS 15L: +3.3 to +5.4 VDC (±100 mV ripple) input. Peak operating current is100 mA. Nominal operating current is 85 mA. This voltage drives an LDO with anominal 3.0 VDC output.GPS 15H: Unregulated 8.0 to 40 VDC input. Peak operating current is 40 mA @12 VDC input. Nominal operating current is 33 mA @ 12 VDC input. Thisvoltage drives a switching regulator with a nominal 3.3 VDC output. Although aregulated supply is not required, the peak-to-peak voltage ripple on this lineshould be kept to less than 100 mV.4 PORT 1DATA OUTSerial Asynchronous OutputRS-232 compatible output normally provides serial data which is formatted perNMEA 0183, Version 2.0. This output is also capable of outputting phase datainformation; see Appendix B: Binary Phase Output Format for details. TheNMEA 0183 baud rate is selectable in the range of 300 to 38400 baud. The defaultbaud rate is 4800.5 PORT 1DATA INFirst Serial Asynchronous InputRS-232 compatible with maximum input voltage range of -25 < V < 25. Thisinput may also be directly connected to standard 3 to 5 VDC CMOS logic thatutilizes RS-232 polarity. The low signal voltage requirement is < 0.6 V, and thehigh signal voltage requirement is > 2.4 V. Minimum load impedance is 500 Ω.This input may be used to receive serial initialization/ configuration data asspecified in section 4.1 Received NMEA 0183 Sentences.6 RF BIAS This input allows the user to supply an external RF bias voltage in the range of 4VDC to 8 VDC to the active antenna. The voltage should be from a clean,regulated supply and should be well isolated from potential sources ofinterference. The supply should not share RF current paths with other systemdevices such as microprocessors or other RF circuits. By default, the unit uses aninternal voltage to power the active antenna.Note: This pin is only operational on units whose serial numbers are higher thanthe serial numbers given below:010-00240-01 GPS 15H-W serial no. 81301857010-00240-02 GPS 15L-W serial no. 81408976010-00240-11 GPS 15H-F serial no. 81901632010-00240-12 GPS 15L-F serial no. 820014717 PPS One-Pulse-Per-Second OutputTypical voltage rise and fall times are 100 ns. Impedance is 250 Ω. The opencircuit output voltage toggles between the low (0 V) and the high (3.3 V for 15Hand 3.0 V for 15L). The default format is a 100 ms wide active-high pulse at a1 Hz rate, with the pulse width configurable in 20 ms increments. Rising edge issynchronized to the start of each GPS second. This output provides a nominal 450mVp-p signal into a 50 Ω load. The pulse time measured at the 50% voltage pointwill be approximately 15 ns earlier with a 50 Ω load than with no load.8 PORT 2DATA INSecond Serial Asynchronous InputThis input may be used to receive serial differential GPS data formatted perRTCM SC-104 Recommended Standards For Differential Navstar GPS Service,Version 2.2 (see section 4.5 for more details).Table 2: GPS 15H & 15L Wire Descriptions