APM32F003F6P6-R datasheet(35/56 Pages) GEEHY

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Page 34

Communication interface

5.10.1.

I2C interface characteristics

Table 40 I2C interface characteristics

Symbol

Parameter

Standard I2C

Fast I2C

Unit

Min

Max

Min

Max

tw(SCLL)

SCL clock low time

5.03

1.73

μs

tw(SCLH)

SCL clock high time

4.90

0.72

tsu(SDA)

SDA setup time

4420

1120

th(SDA)

SDA data holding time

313.09

0(1)

335.97

tr(SDA)

tr(SCL)

SDA and SCL rise time

300.12

301.24

tf(SDA)

tf(SCL)

SDA and SCL fall time

21.3

21.51

th(STA)

Start condition holding time

4.98

0.82

μs

tsu(STA)

Repeated start condition setup

time

4.95

0.87

tsu(STO)

Setup time of stop condition

4.94

0.84

μs

tw(STO:STA)

Time from stop condition to

start condition (bus idle)

5.4

2.08

μs

Note:

(1)

In order to facilitate bridging of undefined areas along the falling edge of SCL, it is recommended

that the device provide a minimum hold time of 300ns internally for the SDA signal.

Figure 8 Bus AC waveform and test circuit

I²C Bus

VDD

4.7KΩ

SCL

SDA

Repeated start condition

Start condition

tsu(STA)

tsu(STO)

tsu(STO:STA)

Stop condition

Start condition

th(SDA)

tf(STA)

SDA

tr(SDA)

tsu(SDA)

tf(SCL)

tw(SCLL)

SCL

th(STA)

tw(SCLH)

MCU

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