Datasheet

Electrical characteristics STM32F20xxx
132/184 DS6329 Rev 16
6.3.23 V
BAT
monitoring characteristics
6.3.24 Embedded 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 14.
6.3.25 FSMC characteristics
Asynchronous waveforms and timings
Figure 57 through Figure 60 represent asynchronous waveforms and Table 72 through
Table 75 provide the corresponding timings. The results shown in these tables are obtained
with the following FSMC configuration:
• AddressSetupTime = 1
• AddressHoldTime = 1
• DataSetupTime = 1
• BusTurnAroundDuration = 0x0
In all timing tables, the T
HCLK
is the HCLK clock period.
Table 70. V
BAT
monitoring characteristics
Symbol Parameter Min Typ Max Unit
R Resistor bridge for V
BAT
-50-KΩ
QRatio on V
BAT
measurement - 2 -
Er
(1)
1. Guaranteed by design, not tested in production.
Error on Q –1 - +1 %
T
S_vbat
(2)(2)
2. Shortest sampling time can be determined in the application by multiple iterations.
ADC sampling time when reading the V
BAT
(1 mV accuracy)
5--µs
Table 71. Embedded 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)
1. Shortest sampling time can be determined in the application by multiple iterations.
ADC sampling time when
reading the internal reference
voltage
-10--µs
V
RERINT_s
(2)
2. Guaranteed by design, not tested in production.
Internal reference voltage
spread over the temperature
range
V
DD
= 3 V - 3 5 mV
T
Coeff
(2)
Temperature coefficient - - 30 50 ppm/°C
t
START
(2)
Startup time - - 6 10 µs
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