RoyalTek REB-4315 - Manual (Page 7)

RoyalTek Confidential
6
REB-4315 Operational Manual
Input pulse is required to start the system, and switch the operation mode to
full-power mode or Hibernate mode.
(7) Wakeup：
Wakeup output indicate the chip states, when chip is working the output is high
level.
Wakeup output can control or enable the external regulator.(Ex. To control
external antenna power)
(8) Boot
Set this pin to high for programming flash.
Normal operation mode it is set to low voltage.
6 Power Design Consideration
Start the REB-4315(GSD4e)
After supply the 1.8v to the P12 VCC_IN_1V8,the REB-4315(GSD4e) awaits a pulse to
the ON_OFF input to start.
Switching to Hibernate State
By ON_OFF:assert an ON_OFF pulse when receiver is in full-power mode
Awakening from hibernate state
When the system is in simple hibernate state, an ON_OFF input pulse is required to start
the system.
Requirements:
‧ The REB-4315(GSD4e) is intended to be used with an always-ON, single voltage supply of
1.8V
‧ The REB-4315(GSD4e) requires an orderly shut-down process to properly stop internal
operation and complete any writes of critical data to BBRAM, EEPROM, or Flash memory
data area (if those functions are in use).
Cautions:
‧
Abrupt removal or droop of main power while the system is running has risks ranging from
fatal corruption of flash memory code area with BGA parts to minor impact on TTFF from lost
data.
‧ Complete removal of 1.8V even after orderly shutdown, will have performance
consequences