Hi Sunil,
According to the Fig 3. State diagram the conditions from state change from OFF to STANDBY mode is:
VBAT > Vth(det)pon AND Tvj < Tth(rel)otp
And the conditions from state change from STANDBY to NORMAL mode is:
EN = 1 AND RSTN = 1.
The Vth(det)p threshold is defined between 3V and 5.25V. The VBAT operating range is from 4.5 V to 28 V.
The overtemperature protection release threshold Tth(rel)otp is defined as 138°C (126°C min; 150°C max).
The EN pin switching threshold voltage is defined in range 0.8V~2V.
The RSTN is output pin influenced mainly by VCC voltage level
The output voltage on pin VCC is monitored continuously and a system reset signal is generated (pin RSTN goes LOW) if an undervoltage event is detected (VCC < Vuvd for tdet(uv)(VCC)). Pin RSTN will go HIGH again once the voltage on VCC exceeds the undervoltage recovery threshold (Vuvr) for trst.
Where
Vuvd = 4.5~4.75V for VCC=5V
tdet(uv)(VCC) = 1~15us
Vuvr = 4.6~4.9V for VCC=5V
Trst = 2~8ms
Your version contains 5V regulator. Therefore you need to provide at least 5.5V to VBATT (there should be voltage in range 5.5 V to 28 V) AND at least 2V at EN pin AND temperature has to be below 126°C.
I hope it helps you.
Have a great day,
Radek
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