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STM32F091XB Datasheet, PDF (95/127 Pages) STMicroelectronics – ARM-based 32-bit MCU, up to 256 KB Flash, CAN, 12 timers, ADC, DAC & comm. interfaces, 2.0 - 3.6V
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STM32F091xB STM32F091xC
Electrical characteristics
Table 67. I2C analog filter characteristics(1)
Symbol
Parameter
Min
Max
tAF
Maximum width of spikes that are
suppressed by the analog filter
50(2)
260(3)
1. Guaranteed by design, not tested in production.
2. Spikes with widths below tAF(min) are filtered.
3. Spikes with widths above tAF(max) are not filtered
Unit
ns
SPI/I2S characteristics
Unless otherwise specified, the parameters given in Table 68 for SPI or in Table 69 for I2S
are derived from tests performed under the ambient temperature, fPCLKx frequency and
supply voltage conditions summarized in Table 24: General operating conditions.
Refer to Section 6.3.14: I/O port characteristics for more details on the input/output alternate
function characteristics (NSS, SCK, MOSI, MISO for SPI and WS, CK, SD for I2S).
Table 68. SPI characteristics(1)
Symbol
Parameter
Conditions
Min
Max
Unit
fSCK
1/tc(SCK)
SPI clock frequency
Master mode
Slave mode
-
-
tr(SCK)
tf(SCK)
tsu(NSS)
th(NSS)
tw(SCKH)
tw(SCKL)
tsu(MI)
tsu(SI)
SPI clock rise and fall
time
NSS setup time
NSS hold time
SCK high and low time
Data input setup time
Capacitive load: C = 15 pF
Slave mode
Slave mode
Master mode, fPCLK = 36 MHz,
presc = 4
Master mode
Slave mode
-
4Tpclk
2Tpclk + 10
Tpclk/2 -2
4
5
th(MI)
Data input hold time
Master mode
4
th(SI)
Slave mode
5
ta(SO)(2) Data output access time Slave mode, fPCLK = 20 MHz
0
tdis(SO)(3) Data output disable time Slave mode
0
tv(SO)
Data output valid time Slave mode (after enable edge)
-
tv(MO)
Data output valid time Master mode (after enable edge)
-
th(SO)
Data output hold time
Slave mode (after enable edge)
11.5
th(MO)
Master mode (after enable edge)
2
DuCy(SCK)
SPI slave input clock
duty cycle
Slave mode
25
18
18
6
-
-
Tpclk/2 + 1
-
-
-
-
3Tpclk
18
22.5
6
-
-
75
MHz
ns
ns
%
1. Data based on characterization results, not tested in production.
2. Min time is for the minimum time to drive the output and the max time is for the maximum time to validate the data.
3. Min time is for the minimum time to invalidate the output and the max time is for the maximum time to put the data in Hi-Z
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