update readme

Readme.md

@@ -8,6 +8,35 @@ Library of Infineon's 3D magnetic sensor TLE493D family (currently supporting W2
 ## Summary
 The 3D Magnetic Sensor 2GO is a budget-priced evaluation board equipped with the magnetic sensor [TLE493D](https://www.infineon.com/cms/en/product/sensor/magnetic-position-sensor/3d-magnetic-sensor/tle493d-w2b6-a0/) for three dimensional measurement combined with an ARM® Cortex™-M0 CPU. The 3D Magnetic Sensor 2GO has a complete set of on-board devices, including an on-board debugger. Build your own application and gadget with the 3D Magnetic Sensor 2GO.
 
+## Usage
+Please follow the example sketches in the /examples directory in this library to learn more about the usage of the library.
+
+Currently you have to make sure which sensor type you are using. The default type is `A0`:
+```
+Tle493d(AccessMode_e mode = MASTERCONTROLLEDMODE, TypeAddress_e productType = TLE493D_A0);
+```
+## Known Issues
+- Reset sequence not working for TLE493d-W2B6. (Requires further testing)
+```
+mInterface.bus->begin();
+mInterface.bus->write(0xFF);
+mInterface.bus->end();
+
+mInterface.bus->begin();
+mInterface.bus->write(0xFF);
+mInterface.bus->end();
+
+mInterface.bus->begin();
+mInterface.bus->write(0x00);
+mInterface.bus->end();
+
+mInterface.bus->begin();
+mInterface.bus->write(0x00);
+mInterface.bus->end();
+```
+
+- TLE493D-A2B6 does not work with low power mode.
+
 ## Key Features and Benefits
 * TLE493D-A2B6 and TLE493D-W2B6 (three dimensional magnetic sensor)
 * XMC1100 (ARM® Cortex™-M0 based)
@@ -27,9 +56,6 @@ To install the 3D magnetic sensor 2GO library in the Arduino IDE, please go now
 
 ![Install Library](https://raw.githubusercontent.com/infineon/assets/master/Pictures/Library_Install_ZIP.png)
 
-## Usage
-Please follow the example sketches in the /examples directory in this library to learn more about the usage of the library.
-
 ## Processing
 This library supports the open-source software [Processing](https://processing.org/) for creating GUIs. It allows you to connect your evaluation board to a PC over serial communication and visualisation of the embedded system. Find out more on the Arduino homepage [here](http://playground.arduino.cc/Interfacing/Processing). The respective files are stored in the /processing folder of this repository.