BU94501AMUV Datasheet, PDF (15/73 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU9450xAxxx series
Datasheet
3. SD I/F
SD memory card SPI interface
Signal name I/O
Function
SD_CS O SD chip select
SD_CLK O SPI clock
SD_DI O SPI data input
SD_DO I SPI data output
SD_CON I SD card connect detection terminal
Remarks
-
-
-
-
H: Do not detect SD card connect,
L: Detect SD card connect
This interface connects to the SD memory card slot to communicate with the SD memory device.
Supports the SPI mode.
Supports SD, SDHC memory cards and MMC, mini-SD and micro-SD cards.
Does not supports CPRM.
Since the SD memory card slot needs to detect the insertion status of the SD memory device, be sure to use the slot
having the SD memory card insertion status detection terminal. The SD_CON terminal is pulled up within the device
and detects “SD card connect” when L is input.
The SD_CON terminal is pulled up within the device and detects “SD card connect” when L is input.
3.1 Timing
（Unless specified, Ta=25℃, VDD1=3.3V, Load=20pF, 10kΩ）
Rating
Item
Symbol
min
typ
SD_CS Setup time
Tcss
-
5
SD_CS Hold time
Tcsh
-
15
SD_CLK Clock Frequency
Tclk
-
13.5
SD_DI Output delay
Tod
-20
-
SD_DO Data in Setup time
Tds
18
-
SD_DO Data in Hold time
Tdh
5
-
Output High Voltage
Voh
0.625*VDD1
-
Output Low Voltage
Vol
-
-
max
-
-
-
20
-
-
-
0.25*VDD1
Unit
us
us
MHz
ns
ns
ns
V
V
Tcss
Tcsh
SD_CS
Tclk
SD_CLK
Voh
Vol
Tod
Remarks
SD_DI
MSB
SD_DO
MSB
Tds
Tdh
Figure 7. SPI I/F Timing
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TSZ02201-0V2V0E600070-1-2
2012.12.10 Rev.003