CC2340R2: Testing Clock Freqs and Startup Times

Luke,

Thanks for your inquiries.

Luke said:

min startup times for HFOSC, LFOSC, LFXT (found it for HFXT)

We currently don't provide characterization data for the minimum startup time for any of the clocks. As a general statement, however, RC oscillators usually reach steady state much faster than crystals. In this case, it is safe to day the timings are much lower than the startup time of HFXT.

Luke said:

block diagram of the system clock tree (using the same internal clock source names as above)

By clock tree you mean a system clock muxing diagram that is present on the other devices, right? If so, the CC2340R clock system is much simpler than the other devices but I will have to check the reason why a similar diagram was not added to the TRM of this family of devices.

Luke said:

is there a recommended port for measuring all oscillator sources (using our own special test code)

You can refer to the topic below on our BLE5 Stack User's guide

https://dev.ti.com/tirex/explore/content/simplelink_lowpower_f3_sdk_8_10_01_02/docs/ble5stack/ble_user_guide/html/ble-stack-5.x-guide/debugging-index-cc23xx.html?highlight=clock#debugging-lf-hf-clock-output

Luke said:

GPIO switching speed

We don't provide characterization data for this parameter.

Hope this helps,

Rafael

Luke,

I talked to some of the folks that worked on the CC2340R TRM and the messaging was that, in contrast with CC265x/CC267x, this family of devices has a very simple clock structure that is explained in section 6.6. Basically a single clock for the two domains, with no intermediate clock dividers and partitioning.

Cheers,

Rafael