Datasheet

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STM32F427xx STM32F429xx Electrical characteristics
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6.3.23 V
BAT
monitoring characteristics
6.3.24 Reference voltage
The parameters given in Table 83 are derived from tests performed under ambient
temperature and V
DD
supply voltage conditions summarized in Table 17.
Table 82. 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 83. internal reference voltage
Symbol Parameter Conditions Min
Typ
Max Unit
V
REFINT
Internal reference voltage –40 °C < T
A
< +105 °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, not tested in production
Table 84. Internal reference voltage calibration values
Symbol Parameter Memory address
V
REFIN_CAL
Raw data acquired at temperature of 30 °C
VDDA
= 3.3 V 0x1FFF 7A2A - 0x1FFF 7A2B
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