Datasheet

Electrical characteristics STM32F446xC/E
148/202 DocID027107 Rev 6
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 16.
6.3.25 DAC electrical characteristics
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.
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
Table 85. DAC characteristics
Symbol Parameter Conditions Min Typ Max Unit Comments
V
DDA
Analog supply
voltage
-1.7
(1)
-3.6 V -
V
REF+
Reference supply
voltage
-1.7
(1)
-3.6VV
REF+
≤ V
DDA
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