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STM32L021D4 데이터시트(PDF) 91 Page - STMicroelectronics

부품명 STM32L021D4
상세설명  Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, 16KB Flash, 2KB SRAM, 512B EEPROM, ADC, AES
PDF  114 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STM32L021D4 데이터시트(HTML) 91 Page - STMicroelectronics

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STM32L021x4
Electrical characteristics
93
Table 65. SPI characteristics in voltage Range 3 (1)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fSCK
1/tc(SCK)
SPI clock frequency
Master mode
--
2
MHz
Slave mode
2(2)
Duty(SCK)
Duty cycle of SPI clock
frequency
Slave mode
30
50
70
%
tsu(NSS)
NSS setup time
Slave mode, SPI presc = 2
4Tpclk
-
-
ns
th(NSS)
NSS hold time
Slave mode, SPI presc = 2
2Tpclk
-
-
tw(SCKH)
tw(SCKL)
SCK high and low time
Master mode
Tpclk-2
Tpclk
Tpclk+2
tsu(MI)
Data input setup time
Master mode
3
-
-
tsu(SI)
Slave mode
3
-
-
th(MI)
Data input hold time
Master mode
16
-
-
th(SI)
Slave mode
14
-
-
ta(SO
Data output access time
Slave mode
30
-
70
tdis(SO)
Data output disable time
Slave mode
40
-
80
tv(SO)
Data output valid time
Slave mode
-
26.5
47
Master mode
-
4
6
tv(MO)
Data output hold time
Slave mode
20
-
-
th(SO)
Master mode
3
-
-
1. Guaranteed by characterization results, not tested in production.
2. The maximum SPI clock frequency in slave transmitter mode is determined by the sum of tv(SO) and tsu(MI) which has to fit
into SCK low or high phase preceding the SCK sampling edge. This value can be achieved when the SPI communicates
with a master having tsu(MI) = 0 while Duty(SCK) = 50%.



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