5 Pre-Configurable Finite State Machine (PFSM) Settings
This section describes the default PFSM settings of the TPS6593-Q1 device. These settings cannot be changed
after device startup. They are only changed through reprogramming of the device.
5.1 Configured States
In this PDN, the following three power states are configured into the PMIC devices:
• Standby
• Active
• Safe
In
, the configured power states are described, along with the transition conditions required to move
between configured states. Additionally, the transitions to hardware states, such as SAFE RECOVERY, are
described.
SU
_AC
TI
VE
->
HI
G
H
1 -> HIGH
IMMED
IAT
E
_
SH
U
T
D
O
W
N
-
>
H
IG
H
IMMED
IATE
_SH
UTD
OWN
-> H
IGH
FO
RC
E_
ST
AN
DBY
->
HIG
H
GPIO3 -> RISE
GPIO3 -> FALL
GPIO4 -> RISE
GPIO4 -> FALL
GPIO10 -> RISE
GPIO10 -> FALL
ACTIVE
STANDBY
SAFE
SAFE_RECO...
Figure 5-1. Pre-Configurable State Machine (PFSM) States and Transitions
The definition for each power state is described below:
STANDBY
The PMIC is powered by a valid supply on the system power rail (VCCA > VCCA_UV) and waiting
for a start-up event or condition. All device resources are powered down in the STANDBY state. If
no changes are needed from the default interface settings, then the device can be re-programmed
in STANDBY state.
ACTIVE
The PMIC is powered by a valid supply and has received a start-up event, such as ENABLE
pin asserted high. The PMIC will keep the outputs of all resources off, but is now ready to be
programmed. The device must be programmed from ACTIVE state if needing to enable SPI or CRC,
or change the default I2C address. If programming is not required, the PMIC is now ready for I2C or
SPI commands (based on GPIO configuration) to configure and enable the output rails of the PMIC.
SAFE
In the event of a severe power error, such as a short circuit or thermal event, the SAFE state
provides a controlled way to shut down all resources safely and quickly before transitioning to SAFE
RECOVERY.
Pre-Configurable Finite State Machine (PFSM) Settings
16
Programmable PMICs: TPS6593-Q1 Default Configuration for TPS6593EVM
SLVUC24 – MAY 2021
Copyright © 2021 Texas Instruments Incorporated
