We have been using TI CC2640 SimpleLink™ Bluetooth® Wireless MCU (part number: CC2640F128RGZR) for about 3 years: performance is OK, no issues for our circuit board and for our device Bluetooth operation over the air.
We have an old FCC report from 2017 for max conducted power (dBm): 0.9 (Low 2402 MHz)/ 0.5 (Mid 2440 MHz)/ 0.17 (High 2480 MHz).
The power is measured using a soldered RF SMA cable on the circuit board.
We are certifying now a new device model with the same TI MCU, no RF changes, same RF circuit, just another IMU (non-RF) chip added outside the RF circuit.
During the new Compliance power measurements test, we use the same FW and the same API: HCI_EXT_ModemTestTxCmd() to transmit modulated or unmodulated carrier on a particular frequency channel.
For the new device a different lab measured max conducted power (dBm) as: -0.2 (Low 2402 MHz) / -0.7 (Mid 2440 MHz) / -0.8 (High 2480 MHz)
This lab is asking: Is it possible that the difference around 1 dB (power reduction on all frequencies), could be caused by CC2640 chip-to-chip max power variation? i.e. do we have such possible range for repeatability between MCU chips?
I looked at the CC2640 specification released by TI, but could not find such information (RF GFSK table on page 16).
