Datasheet

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STM32F745xx STM32F746xx Electrical characteristics
195
5.3.22 Temperature sensor characteristics
5.3.23 V
BAT
monitoring characteristics
5.3.24 Reference voltage
The parameters given in Table 71 are derived from tests performed under ambient
temperature and V
DD
supply voltage conditions summarized in Table 17.
Table 68. Temperature sensor characteristics
Symbol Parameter Min Typ Max Unit
T
L
(1)
V
SENSE
linearity with temperature - ±1 ±2°C
Avg_Slope
(1)
Average slope - 2.5 - mV/°C
V
25
(1)
Voltage at 25 °C - 0.76 - V
t
START
(2)
Startup time - 6 10 µs
T
S_temp
(2)
ADC sampling time when reading the temperature (1 °C accuracy) 10 - - µs
1. Guaranteed by characterization results.
2. Guaranteed by design.
Table 69. Temperature sensor calibration values
Symbol Parameter Memory address
TS_CAL1 TS ADC raw data acquired at temperature of 30 °C, V
DDA
= 3.3 V 0x1FF0 F44C - 0x1FF0 F44D
TS_CAL2 TS ADC raw data acquired at temperature of 110 °C, V
DDA
= 3.3 V 0x1FF0 F44E - 0x1FF0 F44F
Table 70. 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 71. 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
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