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Summary of Contents for unicore UM220-IV NL
- Page 1 HARDWARE REFERENCE DESIGN WWW.UNICORECOMM.COM UM220-IV NL Industry Grade Multi-GNSS Positioning Module Copyright© 2009-2023, Unicore Communications, Inc. Data subject to change without notice.
- Page 2 Unicore with respect to the fitness for a particular purpose/use, the accuracy, reliability and correctness of the information contained herein. Information, such as product specifications, descriptions, features and user guide in this manual, are subject to change by Unicore at any time without prior notice, which may...
- Page 3 UM220-IV NL Hardware Reference Design not be completely consistent with such information of the specific product you purchase. Should you purchase our product and encounter any inconsistency, please contact us or our local authorized distributor for the most up-to-date version of this manual along...
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Page 4: Table Of Contents
Contents Minimum System Reference Circuit ................. 1 Reference Circuit Using a Passive Antenna .............. 2 Antenna State Detection Reference Circuit ............... 3 Power Supply Requirements ..................4 Main Supply (VCC) ....................... 4 Backup Supply (V_BCKP) .................... 4 Attachment ......................5... -
Page 5: Minimum System Reference Circuit
UM220-IV NL Hardware Reference Design 1 Minimum System Reference Circuit Supply 3.0V~3.6V power VCC Ground all GND pins of the module Connect RF_IN signal to antenna, note the 50 Ω impedance match on the circuit Upgrade the module via port 1, ensuring that serial port 1 can interconnect with ... -
Page 6: Reference Circuit Using A Passive Antenna
2 Reference Circuit Using a Passive Antenna To ensure the system performance, low noise amplifier and filter should be added between the passive antenna and the module RF_IN If the user has a high requirement for ESD (> ± 2000 V), the user should consider ... -
Page 7: Antenna State Detection Reference Circuit
Antenna state detection uses the principle of feeding current detection, and the antenna state detection function is not supported when the antenna is not fed. The detection circuit for the antenna state is not integrated inside the UM220-IV NL module, the antenna state detection function can be realized through the external circuit. -
Page 8: Power Supply Requirements
4 Power Supply Requirements 4.1 Main Supply (VCC) The voltage range of VCC is 3.0 V ~ 3.6 V. Notes: The VCC initial level when power-on should be less than 0.4 V. The VCC ramp when power-on should be monotonic, without plateaus. ... -
Page 9: Attachment
The series resistance for UART, PPS or other GPIO can avoid the abnormal operation generated when the user connects UM220-IV NL to AP or MCU applications, there is voltage through the above interface to UM220IV NL while the module powers off but AP or MCU is still at work. - Page 10 Option 2 When the module is not powered on, make sure the IO port connected to the module is in high resistance state or low level to avoid leakage power. Note: Because of the series resistance, the user should assess that the external equivalent pull-up resistance should be large enough (for example, greater than 10k) to avoid affecting the correct identification of the logical level.
- Page 11 和芯星通科技（北京）有限公司 Unicore Communications, Inc. 北京市海淀区丰贤东路 7 号北斗星通大厦三层 F3, No.7, Fengxian East Road, Haidian, Beijing, P.R.China, 100094 www.unicorecomm.com Phone: 86-10-69939800 Fax: 86-10-69939888 info@unicorecomm.com...
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