Data Sheet

FLC-BTM901 Datasheet
Flaircomm Microelectronics,Inc. - 20-
7 System Power States
In a system-wide low-power state, software moves between these static power states to
reduce total system power.
7.1 No Power State
When the BTM901 has no power at all, it is in the No Power state. When power is
present, for example on battery attach, the BTM901 automatically boots and moves to
Active state.
7.2 Active State No Power State
In Active state, the BTM901 clocks and power supplies are running, and all functions of
the BTM901 are available.
7.3 Shallow Sleep State
Shallow Sleep state is functionally the same as the Active state. However, individual
subsystems can autonomously enter Shallow Sleep state to conserve power. In Shallow
Sleep state, a subsystem can turn off or reduce the frequency of clocks and/or power
down memories.
7.4 Deep Sleep State
In Deep Sleep state, the main digital power rail is in state retention. To reduce leakage
the digital
voltage is typically reduced to 0.85 V. The main digital clocks are stopped and a limited
number of device features remain active, including:
■ Boot Manager
■ LED PWM drivers
■ PIO controller
BTM901 extensively uses digital power islands. Deep Sleep state current varies
significantly depending on which functions are active or in state retention.
The following events can move BTM901 to Active state (selectable via software) from
Deep Sleep state:
■ A rising edge on SYS_CTRL
■ A rising edge or a falling edge on VCHG