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--- resources:healthcare:faq [25 May 2021 10:45] – Updated 0.4 Rajiv Mulay
+++ resources:healthcare:faq [25 May 2021 10:46] – Updated 0.4 Rajiv Mulay
@@ Line 96: / Line 96: @@
 </WRAP>
-==== B. Photo Plethysmography ====
+**B. Photo Plethysmography**
+<fc #4682b4>**1. How is the PPG and acceleration data synchronized?**</fc>
+<WRAP center round box 100%>
+The PPG sensor (ADPD) and the acceleration sensor (ADXL) are synchronized by hardware on the PPG application. The PPG algorithm requires the same sampling frequency on both devices to perform properly under motion conditions. The ADPD and ADXL devices are configured to run in external sampling mode. The MCU triggers both the devices based on the ODR configured. Since the trigger pulses are generated from a single clock source, both are synchronized. ADPD and ADXL are also tested for synchronization when they are integer multiples of the source clock. ADPD has been tested at ODR values of 12.5,25,50,100,250,300,400,500 and 1000Hz.ADXL has been tested at ODR values of 12.5,25,50,100,200,400.
+</WRAP>
+----

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