Chengdu Ebyte Electronic Technology Co.,Ltd
E79-900DM2005S User Manual
Copyright ©2012–2019
，
Chengdu Ebyte Electronic Technology Co.,Ltd
8
achieve long-term stable operation of the system;
The installation location of the module should be as far away as possible from the power supply, transformers,
high-frequency wiring and other parts with large electromagnetic interference;
High-frequency digital routing, high-frequency analog routing, and power routing must avoid module locations. If the
wiring must pass under the module, assuming that the module is soldered to the Top Layer, the area where the module is in
contact with the Top Layer should be covered with copper (all copper is well grounded), and the area must be close to the digital
part of the module and routed in the Bottom Layer;
If the module is soldered or placed in the Top Layer, it is wrong to randomly route on the Bottom Layer or other layers,
which will affect the spurs and receiving sensitivity of the module to varying degrees;
If there is a device with large electromagnetic interference around the module, it will greatly affect the performance of the
module. It is recommended to maintain the distance from the module according to the strength of the interference. If
circumstances permit, it is recommended to do proper isolation and shielding;
If there are wirings with large electromagnetic interference around the module (such as high frequency digital, high
frequency analog, power line), the performance of the module will be greatly affected. It is recommended to do proper isolation
and shielding;
Try to keep the module away from some physical layers such as the 2.4GHz TTL protocol, for example: USB3.0;
The antenna installation structure has a great influence on the performance of the module. Make sure that the antenna is
exposed and preferably vertical. When the module is installed inside the casing, it is recommended to use a good antenna
extension cable to extend the antenna to the outside of the casing;
The antenna must not be installed inside the metal case, which will greatly reduce the transmission distance.
5.2 Programming
The core of this module is CC1352P, and the user can operate according to the CC1352P chip manual.
Recommended parameters of frequency accuracy
Adjust the parameter of SET_CCFG_MODE_CONF_XOSC_CAPARRAY_DELTA in
ccfg.c file
to 0xFA
Power grading: 20dBm, 17dBm, 14dBm, 11dBm, power configuration code is as follows:
20dBm - The code is as follows
：
// Overrides for CMD_PROP_RADIO_DIV_SETUP_PA
uint32_t pOverridesTx20[] =
{
// The TX Power element should always be the first in the list
TX20_POWER_OVERRIDE(0x0020AA1B),
// The ANADIV radio parameter based on the LO divider (0) and front-end (0) settings
(uint32_t)0x11C10703,
// override_phy_tx_pa_ramp_genfsk_hpa.xml
// Tx: Configure PA ramping, set wait time before turning off (0x1F ticks of 16/24 us = 20.3 us).
