Figure 7-5 Wake-up from SLEEP State to
STANDBY State Transition for HW Variant
Hand shake between controller and device during wake-up as follows:
- t0: Controller - nSLEEP asserted high to initiate device wake-up
- t1: Device internal state - Wake-up command registered by device (end of
Sleep state)
- t2: Device – nFAULT asserted
low to acknowledge wake-up and indicate device ready for communication
- t3: Device internal state - Initialization complete
- t4 (any time after t2): Controller – Issue nSLEEP reset pulse
to acknowledge device wake-up
- t5: Device - nFAULT
de-asserted as an acknowledgment of nSLEEP reset pulse. Device in STANDBY
state
Figure 7-6 Power-up to STANDBY State
Transition for HW Variant
Hand shake between controller and device during power-up as follows:
- t0: Device internal state - POR asserted based on under voltage of internal
LDO (VM dependent)
- t1: Device internal state – POR de-asserted based on recovery of internal
LDO voltage
- t2: Device – nFAULT asserted
low to acknowledge wake-up and indicate device ready for communication
- t3: Device internal state - Initialization complete
- t4 (any time after t2):
Controller – Issue nSLEEP reset pulse to acknowledge
device power-up
- t5: Device - nFAULT
de-asserted as an acknowledgment of nSLEEP reset pulse. Device in STANDBY
state