Electrical characteristics
STM32F031x4 STM32F031x6
84/113
DocID025743 Rev 3
Figure 28. SPI timing diagram - master mode
1.
Measurement points are done at CMOS levels: 0.3 V
DD
and 0.7 V
DD
.
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Table 60. I
2
S characteristics
(1)
Symbol
Parameter
Conditions
Min
Max
Unit
f
CK
1/t
c(CK)
I
2
S clock frequency
Master mode (data: 16 bits, Audio
frequency = 48 kHz)
1.597
1.601
MHz
Slave mode
0
6.5
t
r(CK)
I
2
S clock rise time
Capacitive load C
L
= 15 pF
-
10
ns
t
f(CK)
I
2
S clock fall time
-
12
t
w(CKH)
I2S clock high time
Master f
PCLK
= 16 MHz, audio
frequency = 48 kHz
306
-
t
w(CKL)
I2S clock low time
312
-
t
v(WS)
WS valid time
Master mode
2
-
t
h(WS)
WS hold time
Master mode
2
-
t
su(WS)
WS setup time
Slave mode
7
-
t
h(WS)
WS hold time
Slave mode
0
-
DuCy(SCK)
I2S slave input clock duty
cycle
Slave mode
25
75
%
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http://www.vicor.top/
021-31660491