LC79 or LC29 recommendation

IoT Modules GNSS Module
1

For new design, would you recommend LC79 or LC29?

  1. what is the difference?
  2. we need dual-bands, GPS, BDS, Glonass, Galileo.
  3. For battery mobile device.
  4. NOT RTK, meters accuracy.
  5. EPO download by cellular phone module.
  6. which ‘full model number(string after LC79/LC29)’’ you recommend? for example, LC29HALMD
    Thanks

对于新设计，您推荐 LC79 还是 LC29？

  1. 有什么区别？
  2. 我们需要双频，GPS、北斗、格洛纳斯和伽利略。
  3. 用于电池供电的移动设备。
  4. 不是 RTK，而是米级精度。
  5. 通过手机模块下载 EPO。
  6. 您推荐哪种“完整型号（LC79/LC29 后的字符串）”？例如，LC29HALMD
    谢谢
2

Hi Wilson,

Thanks for selecting Quectel GNSS module. These two models share the same protocol and configurations.
The main difference is the mechanical size. It depends on your hardware design.
Another difference is the voltage domain. LC29HAA is 3.3V, LC79HAL is 1.8V.
For your requirement, you can consider LC29HAAMD or LC79HALMD.

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Best regards

3

(1) LC79 is 1.75–1.98 V, Typ. 1.8 V.

Can I use switch mode power supply to step down from Lithium cell ( 3.7 to 4.2 V)?

Will switching noise affect GNSS?

Any recommendation of switch mode power supply chip brand, model number and switch frequency?
thanks

(2) Does LC79 support flash-based 30 days EPO, EASY and LOTUS?

(1) LC79 的电压范围为 1.75–1.98 V，典型值 1.8 V。

我可以使用开关电源将锂电池（3.7 V 至 4.2 V）降压吗？
开关噪声会影响 GNSS 吗？
有没有推荐的开关电源芯片品牌、型号和开关频率？

(2) LC79 是否支持基于闪存的 30 天 EPO、EASY 和 LOTUS 系统？

谢谢

4

Hi Wilson,

It’s more recommended to use LDO instead of switch mode for power supply. LDO can provide stable and clear power, which has less ripple.
Please ensure that the VCC and V_BCKP have no rush or drop during the rising time, and then keep the voltage stable. The recommended ripple is < 50 mV.

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Best regards.

5

Many thanks for advises