STW4811MBRASLASHLF datasheet(30/85 Pages) STMICROELECTRONICS

30 / 85 page

Functional description

STw4811M/STw4811N

30/85

CD00131784

Registers controlled by main I2C BUS

I2C controlled registers are controlled through the main serial I2C interface, SCL and SDA

balls.

Configuration 1 register

In Flash OTP two registers allow to program STw4811 energy management part.

These two registers are at addresses 1E and 1F and must be programmed with

1F register

first followed by

1E register.

Table 18.

Configuration 1 register (11h)

pdn_vaux

it_warn

monitoring_vio_

vmem_vcore

mmc_ls_

status

vmmc_sel[2:0]

pdn_

vmmc

R/W

R(1)

These bits are reset (0) after reading

R/W

Bits

Name

Value

Settings

Default

pdn_vaux

Inactive

Enable LDO vaux

0(1)

In STw4811M, pdn_vaux = 0 is the default. In STw4811N, pdn_vaux = 1 is the default.

6it_warn

Below temperature threshold

Above temperature threshold

monitoring_vio_

vmem_vcore

Outputs in the good range

Outputs lower than expected on vio_vmem or vcore

mmc_ls_status

Level shifters ON, if ‘pdn_vmmc’ or

‘external_vmmc’ = 1

Level shifters High Impedance, if ‘pdn_vmmc’ or

‘external_vmmc’ =1

[3:1] vmmc_sel[2:0]

000

001

010

011

100

101

110

111

1.8V selection

2.85V selection

3V selection

1.85 V selection

2.6 V selection

2.7 V selection

3.3 V selection

000

pdn_vmmc

Inactive

Enable SD/MMC/SDIO function.

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