Preliminary User's Manual l MBLS1012AL UM 0001 l © 2019, TQ-Systems GmbH
Page 18
4.2.11
SD card
TQMLS1012AL
ESD
Protection
MicroSD card
slot
eSDHC1
Illustration 17:
Block diagram SD card
A microSD card is used as non-volatile program memory. Alternatively, an eMMC memory can be used instead.
In the reset phase, the CPU requires a high signal (1.8 V) at signal SDHC1_CD#. For this reason, the signal is separated by a tristate
buffer during reset (see also (3), Table 5 and Figure 15). The pull-up is located on the TQMLS1012AL. All data lines provide ESD
protection.
Standard, high and extended capacity Card types are supported. For the transfer rates, the SD UHS-1 speed mode SDR104 with
theoretical max. 104 MB/s is supported in addition to Default Speed and High Speed Mode. The support of the UHS-1 speed
modes SDR12, SDR25, SDR50 and DDR50 is theoretically given but not verified.
The signals of the SDHC1 interface on the TQMLS1012AL are supplied via a separate PMIC controller, whose voltage value can be
set by the CPU to a 1.8 V or 3.3 V level (depending on the transmission mode). The conversion is usually done by the
corresponding driver and does not have to be done explicitly.
The signal SDHC1_WP is not used and is terminated accordingly.
Table 21:
Pinout microSD card X9
Pin
Pin name
Target pin / Net
Remark
1
DAT2
SDHC1_DAT2 (TP43)
34 kΩ Pull-Up
2
DAT3
SDHC1_DAT3 (TP44)
34 kΩ Pull-Up
3
CMD
SDHC1_CMD (TP40)
34 kΩ Pull-Up
4
VDD
V_3V3
–
5
CLK
SDHC1_CLK (TP39)
–
6
GND
GND
–
7
DAT0
SDHC1_DAT0 (TP41)
34 kΩ Pull-Up
8
DAT1
SDHC1_DAT1 (TP42)
34 kΩ Pull-Up
M1…4
SHIELD
GND
–
Illustration 18:
Position of microSD card socket X9
4.2.12
SPI
The SPI interface is available at X18 if the Reset Configuration Word (RCW) of the TQMLS1012AL is set accordingly.
