STW4811M STMicroelectronics, STW4811M Datasheet - Page 54

• Manufacturer Part Number: STW4811M
• Description: Power Management For Multimedia Processors
• Manufacturer: STMicroelectronics

Functional description
4.5
Figure 14. SD/MMC/SDIO block diagram
4.5.1
54/87
MCDATA31DIR
MCDATA0DIR
MCDATA2DIR
MCDATA[3:1]
MCFBCLK
MCCMDDIR
MCDATA0
MCCMD
MCCLK
SD/MMC/SDIO module
SD/MMC/SDIO LDO supply
The Vmmc LDO is supplied via the input Vbat_Vmmc. According to the protection diode
design, the voltage on this input pin Vbat_Vmmc must be always higher or equal to the
battery voltage.
By programming ‘vmmc_sel[2:0] bits of configuration 1 register (
provides the power supply (1.8 V, 1.85 V, 2.6 V, 2.7 V, 2.85 V, 3 V, 3.3 V) with a 150 mA
current compliance for any of the following peripherals.
●
●
●
If an application does not request to use the level shifter feature, this LDO can be used to
supply an other peripheral, in this case, to reduce the internal current consumption due to
level shifter it is recommended to set to “1” ‘mmc_ls_status’ bit of configuration 1 register
(
If an application, like HDD, requests more than 150 mA current supply and the use of the
internal level shifters, internal LDO must be disabled.
The application will be supplied by an external LDO and internal level shifter will be directly
supplied by the external LDO.
In this configuration, ‘pdn_vmmc’ bit is set to “0”, ‘mmc_ls_status’ is set to “0” (
‘external_vmmc’ bit is set to “1” (
Table 18
VIO_VMEM
Vbat_Vmmc >= Vbat
SD card
MMC card
SDIO card
5*RB
).
3*RA
SD/ MMC/SDIO interface
shifter
Level
Driver
Table 28
3*RA
150 mA
RB
LDO
).
VBAT_VMMC
VMMC
CLKOUT
CMDOUT
DATAOUT0
DATAOUT[3:1]
LATCHCLK
Table 18
EMIF
Dz
STw4811M/STw4811N
Rs
RC
Dz
), this LDO
Table 18
SD, MMC
SDIO OR
cards
) and