Datasheet

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STM32F401xD STM32F401xE Electrical characteristics
114
6.3.24 SD/SDIO MMC card host interface (SDIO) characteristics
Unless otherwise specified, the parameters given in Table 77 for the SDIO/MMC interface
are derived from tests performed under the ambient temperature, f
PCLK2
frequency and V
DD
supply voltage conditions summarized in Table 14, with the following configuration:
• Output speed is set to OSPEEDRy[1:0] = 10
• Capacitive load C = 30 pF
• Measurement points are done at CMOS levels: 0.5V
DD
Refer to Section 6.3.16: I/O port characteristics for more details on the input/output
characteristics.
Figure 44. SDIO high-speed mode
T
Coeff
(2)
Temperature coefficient - - 30 50 ppm/°C
t
START
(2)
Startup time - - 6 10 µs
1. Shortest sampling time can be determined in the application by multiple iterations.
2. Guaranteed by design, not tested in production
Table 75. Embedded internal reference voltage (continued)
Symbol Parameter Conditions Min
Typ
Max Unit
Table 76. Internal reference voltage calibration values
Symbol Parameter Memory address
V
REFIN_CAL
Raw data acquired at temperature of
30 °C V
DDA
= 3.3 V
0x1FFF 7A2A - 0x1FFF 7A2B
t
W(CKH)
CK
D, CMD
(output)
D, CMD
(input)
t
C
t
W(CKL)
t
OV
t
OH
t
ISU
t
IH
t
f
t
r
ai14887
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