BU94605AKV Datasheet, PDF (14/84 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card +CD-ROM+MP3 Record

BU94605AKV BU94607AKV BU94702AKV BU94705AKV
Datasheet
3. SD I/F
SD memory card SPI interface
Signal name
I/O
Function
FL_CS
O Serial flash ROM chip select
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
SD_WP
I SD card write-protect detection terminal
Remarks
H: Do not detect SD card connect,
L: Detect SD card connect
H: SD write-protect valid,
L: SD write-protect invalid
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 support CPRM.
Since the SD memory card slot needs to detect the insertion status of the SD memory device and the write-protect status,
be sure to use the slot having the SD memory card insertion status detection terminal and the WP terminal and connect it
to the terminals. The SD_CON terminal is pulled up within the device and detects “SD card connect” when L is input.
The SD_WP terminal is pulled up within the device and detects “SD card no-write-protect” when L is input.
SD I/F is also used as an external serial flash ROM I/F.
3.1 Timing
Table 2. 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
Remarks
Figure 5. SPI I/F Timing
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2012.12.10 Rev.002