Datasheet

DS9716 Rev 11 111/139
STM32F401xB STM32F401xC Electrical characteristics
113
6.3.22 V
BAT
monitoring characteristics
6.3.23 Embedded reference voltage
The parameters given in Table 75 are derived from tests performed under ambient
temperature and V
DD
supply voltage conditions summarized in Table 14.
6.3.24 SD/SDIO MMC card host interface (SDIO) characteristics
Unless otherwise specified, the parameters given in Table 7 7 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
Table 74. V
BAT
monitoring characteristics
Symbol Parameter Min Typ Max Unit
R Resistor bridge for V
BAT
-50-KΩ
Q Ratio on V
BAT
measurement - 4 - -
Er
(1)
Error on Q –1 - +1 %
T
S_vbat
(2)(2)
ADC sampling time when reading the V
BAT
1 mV accuracy
5--µs
1. Guaranteed by design.
2. Shortest sampling time can be determined in the application by multiple iterations.
Table 75. Embedded internal reference voltage
Symbol Parameter Conditions Min Typ Max Unit
V
REFINT
Internal reference voltage –40 °C < T
A
< + 125 °C 1.18 1.21 1.24 V
T
S_vrefint
(1)
ADC sampling time when reading the
internal reference voltage
-10--µs
V
RERINT_s
(2)
Internal reference voltage spread over the
temperature range
V
DD
= 3V ± 10mV - 3 5 mV
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.
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
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