Fix math: 8192 = 2 ** 13

Merges https://github.com/espressif/esp-idf/pull/3133

diff --git a/docs/en/api-reference/peripherals/ledc.rst b/docs/en/api-reference/peripherals/ledc.rst
index fe17cc425b86bd822aefa6d6abd6a79fb6189229..61ad949b921d50afae2f99f0ad9ae91b683d5071 100644 (file)
--- a/docs/en/api-reference/peripherals/ledc.rst
+++ b/docs/en/api-reference/peripherals/ledc.rst
@@ -139,7 +139,7 @@ For additional details regarding speed modes please refer to `ESP32 Technical Re
 Supported Range of Frequency and Duty Resolution
 ------------------------------------------------
 
-The LED PWM Controller is designed primarily to drive LEDs and provides wide resolution of PWM duty settings. For instance for the PWM frequency at 5 kHz, the maximum duty resolution is 13 bits. It means that the duty may be set anywhere from 0 to 100% with resolution of ~0.012% (13 ** 2 = 8192 discrete levels of the LED intensity).
+The LED PWM Controller is designed primarily to drive LEDs and provides wide resolution of PWM duty settings. For instance for the PWM frequency at 5 kHz, the maximum duty resolution is 13 bits. It means that the duty may be set anywhere from 0 to 100% with resolution of ~0.012% (2 ** 13 = 8192 discrete levels of the LED intensity).
 
 The LEDC may be used for providing signals at much higher frequencies to clock other devices, e.g. a digital camera module. In such a case the maximum available frequency is 40 MHz with duty resolution of 1 bit. This means that duty is fixed at 50% and cannot be adjusted.