I am investigating the temperature reference for this device.
In figure 1 of the datasheet (the block diagram) the TS (temperature sense input) is fed to a comparator. The other input of the comparator comes from a voltage reference block. My question is is this derived from a band gap reference or is it divided down from the Vcc rail?
On page 9 in the section titled 'Temperature monitoring' the reference voltages are described as being
Vtco = 0.4*Vcc
Vhtf = 0.44*Vcc
Vltf = 0.6*Vcc
Which suggests that Vcc is divided down (and so eliminating inacurracies due to variation of Vcc when comparing to a thermistor divider network. Is this correct?
Thanks for your help.
