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TMS570LC4357: on-board temperature sensors

Part Number: TMS570LC4357

Hello,
I am using TMS570LC43 trying to read the internal temperature sensors for now I am testing T1 which is connected to AD1IN[31]

my first question, can I use this temperature sensor to read the room temperature or its a kind of indication for the internal processor temperature which will be different than the room temperature 

second question, regarding the calibration values of the sensor according to reference manual table 7-8 ,

-- ADC value Temperature 
lowest calibration 1957 303
midpoint 1543 233
highest calibration 2528 398

how are the values of the midpoint lower than the lowest calibration !!! this is very strange for me
according to this table the linear equation of the temperature is (Temp = 0.169082 X ADC_Value -27.8937
so for example I am reading 3051 at the room temperature and this means 214.9758454 which doesn't make any sense for me