Summary of Contents for unicore UFirebird II
- Page 1 用户手册 HARDWARE REFERENCE DESIGN WWW.UNICORECOMM.COM UFirebird II - UC6580 Dual-frequency GNSS Positioning Chip Copyright© 2009-2023, Unicore Communications, Inc. Data subject to change without notice.
- Page 2 UC6580 Hardware Reference Design Revision History Version Revision History Date R1.0 First release Sep., 2023...
- Page 3 This manual does not represent, and in any case, shall not be construed as a commitments or warranty on the part of Unicore with respect to the fitness for a particular purpose/use, the accuracy, reliability and correctness of the information contained herein.
- Page 4 UC6580 Hardware Reference Design Foreword This document gives the hardware reference design of the chip UC6580 from Unicore. Target Readers This document applies to technicians who possess the expertise on GNSS receivers.
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Page 5: Table Of Contents
Contents Reference Design ..................1 LDO Mode ......................... 1 DC/DC Mode........................2 Attention ....................3 Power ..........................3 Reset Signal ........................4 RTC ............................ 4 TCXO ..........................5 Recommended BOM ................6 Appendix Simplest Design to Replace UC6226 ..........8... -
Page 6: Reference Design
UC6580 Hardware Reference Design 1 Reference Design If you do not need the RTC and backup function, connect V_BCKP to VDD_IO. UC6580 RTC and backup function are the prerequisites of GNSS hot start. Refer to Datasheet for more details. LDO Mode Under the LDO mode: ... -
Page 7: Dc/Dc Mode
DC/DC Mode Under the DC/DC mode: DCDC_IN and VDD_IO use the same power supply; Use the internal DC/DC to power the system; Power the external TCXO by LDO_X; Connect RTC Crystal externally; Connect LNA and SAW externally; ... -
Page 8: Attention
UC6580 Hardware Reference Design 2 Attention Power DCDC_IN and VDD_IO use the same external power supply. For all the power supplies, the ripple voltages must not exceed 50 mV. The value of LDO_X must be lower than VDD_IO and the default is 1.7 V to 1.9 V. To improve the product stability, it is recommended to control the power on and off of UC6580 by the controlling terminal of the power supply. -
Page 9: Reset Signal
Reset Signal UC6580 supports system reset. The reset signal is active low and the active time should be no less than 5 ms. RTC is usually driven by an on-chip 32.768 kHz oscillator, which needs to be connected to an external 32.768 kHz crystal. Instead of this, UC6580 supports directly inputting RTC_I with an external 32.768 kHz digital clock signal. -
Page 10: Tcxo
UC6580 Hardware Reference Design TCXO The CLK_I pin connects an external TCXO of 26 MHz. The power supply of TCXO can be LDO_X or an external independent LDO power supply. In order to ensure the chip boots normally, the 26 MHz clock should work stably no later than 10 ms after the chip is powered. -
Page 11: Recommended Bom
3 Recommended BOM Table 3-1 Recommended BOM Category Description Type Manufacturer Capacitor 0402 surface mount CC0402MRX5R5BB106 YAGEO capacitor 10 μF, ± 20%, X5R, 6.3 V Capacitor 0201 surface mount GRM033C80J105ME05D Murata capacitor 1 μF, ± 20%, X6S, 6.3 V Capacitor 0201 surface mount C0603X7S1A104K030BC capacitor 100 nF, ±... - Page 12 UC6580 Hardware Reference Design Category Description Type Manufacturer Resistor Chip resistor AC0201JR-074K7L YAGEO 4.7 kΩ, 1/20 W, ± 5%, 0201 Resistor Chip resistor RC0402JR-0733RL YAGEO 33 Ω, 1/16 W, ± 5%, 0402 High gain, dual-band LNA MXDLN14TP MAXSCEND LGA 6-pin 1.5 mm ×...
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Page 13: Appendix Simplest Design To Replace Uc6226
UC6580 can replace the UC6226 (QFN40) in the circuits. If your product uses UC6226 (QFN40), you can upgrade it with UC6580. Please contact Unicore FAE if necessary. This section introduces the simplest way to fulfill the replacement. You can design your circuits according to Figure 0-1 and Table 0-1. - Page 14 UC6580 Hardware Reference Design Table 0-1 Simplest design to replace UC6226 Pin No. UC6226NI/AS UC6580 Description UC6580: floating VDD_ANA IF_OUT Not compatible Both floating XTAL_O Compatible Both connect a 1 μF capacitor externally LDO_F_OUT LDO_EX Compatible UC6580: can be floating or connect a 1 μF PIO17 V_DET capacitor externally...
- Page 15 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 www.unicorecomm.com...