Product Info

DWM1001C Datasheet

2 DWM1001C

ALIBRATION

Depending on the end-use applications and the system design, DWM1001C settings may need to be tuned. To

help with this tuning several built in functions such as continuous wave transmission and continuous packet

transmission can be enabled. See the DW1000 User Manual [3] for further details.

2.1.1 Crystal Oscillator Trim

DWM1001C modules are calibrated at production to minimise initial frequency error to reduce carrier frequency

offset between modules and thus improve receiver sensitivity. The calibration carried out at module production

will trim the initial frequency offset to less than 3 ppm, typically.

2.1.2 Transmitter Calibration

The DWM1001C is calibrated in module production, the calibrated values is permanently stored in the DW1000

OTP. This module is calibrated to meet the regulatory power spectral density requirement of less than -

41.3 dBm/MHz.

2.1.3 Antenna Delay Calibration

In order to measure range accurately, precise calculation of timestamps is required. To do this the antenna delay

must be known. The DWM1001C allows this delay to be calibrated and provides the facility to compensate for

delays introduced by PCB, external components, antenna and internal DWM1001C delays.

When using the pre-loaded embedded firmware of the DWM1001C module, the Antenna Delay has been pre-

calibrated for this configuration. The antenna delay is stored in OTP memory.

To calibrate the antenna delay, range is measured at a known distance using two DWM1001C systems. Antenna

delay is adjusted until the known distance and reported range agree.

Antenna delay calibration must be carried out as a once off measurement for each DWM1001C design

implementation. If required, for greater accuracy, antenna delay calibration should be carried out on a per

DWM1001C module basis, see DW1000 User Manual [3] for full details. Further details can be found in the

Antenna Delay Application Note [8].