STM32F051R4U7(2012) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32F051R4U7
(Rev.:2012)

Low- and medium-density advanced ARM™-based 32-bit MCU with 16 to 64 Kbytes Flash, timers, ADC, DAC and comm. interfaces

STMicroelectronics 

STM32F051x

Table 65. I2C analog filter characteristics(1)

Symbol

Parameter

Min

tSP

Pulse width of spikes that are

suppressed by the analog filter

50

1. Guaranteed by design, not tested in production.

Figure 25. I2C bus AC waveforms and measurement circuit

6$$

6$$

)#BUS

2

2

Ω

-#5

Ω

3$!

3#,

Electrical characteristics

Max

Unit

260

ns

3$ !

TF3$!

3 4!24

3 4!242%0%!4%$

TSU34!

3 4!24

TR3$!

TSU3$!

TH34!

TW3#,,

TH3$!

3 4/0

TW34/34!

3#,

TW3#,(

TR3#,

TF3#,

TSU34/

-36

1. Measurement points are done at CMOS levels: 0.3 VDD and 0.7 VDD.

SPI/I2S characteristics

Unless otherwise specified, the parameters given in Table 66 for SPI or in Table 67 for I2S

are derived from tests performed under ambient temperature, fPCLKx frequency and VDD

supply voltage conditions summarized in Table 20.

Refer to Section 6.3.13: 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 66. SPI characteristics

Symbol

Parameter

fSCK

1/tc(SCK)

tr(SCK)

tf(SCK)

SPI clock frequency

SPI clock rise and fall

time

Conditions

Master mode

Slave mode

Capacitive load: C = 15 pF

Min

Max

Unit

-

18

MHz

-

18

-

6

ns

Doc ID 022265 Rev 3

87/105

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