EFP01 datasheet(22/158 Pages) SILABS

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3.3 Energy Modes

The EFP01 operates in 3 different energy modes to optimize efficiency based on the expected load.

Table 3.8. Energy Modes Overview

Energy Mode Maximum Out-

put Current (per

output)

BIAS_SW Regis-

ter Programming

Coarse Regula-

tor

DCDCs and

LDOs

ADC

Coulomb Coun-

ter

EM0

Full Output Cur-

rent (value de-

pends on mode

and configuration)

BIAS0 = 7

Disabled

On, if enabled

Available

EM2

~20 mA (value

depends on mode

and configuration)

BIAS2 = 1

Disabled

On, if enabled.

Note that if

BB_CTRL6.BB_I

PK_NOADJ is set

in Boost modes,

no peak current

adjustment will

occur in EM2.

Available

EM4

~100 uA

N/A

Enabled accord-

ing to setting of

CRSREG_EN_X

bits in

EM_CRSREG_C

TRL

All DCDCs and

LDOs disabled

Disabled

Not supported

3.3.1 Energy Mode Control

The energy mode state of EFP01 can be changed either by I2C or via direct pin control.

3.3.1.1 I2C Control

Using standard I2C control, the EFP01's energy mode can be set by writing the EM_STSEL bitfield in the EM_CRSREG_CTRL register.

The EFP01's internal pull up resistors on I2C_SDA and I2C_SCL pins will continue to be enabled in EM2 and EM4 modes when using

this method.

EFP01 Energy Friendly PMIC Family Data Sheet

System Overview

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