APM32E103CCU6-R datasheet(52/79 Pages) GEEHY

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Symbol

Parameter

Standard I2C

Fast I2C

Unit

Min

Max

Min

Max

tsu(STA)

Repeated start condition setup time

4.7

0.6

tsu(STO)

Setup time of stop condition

4.0

0.6

tw(STO:STA)

Time from stop condition to start condition

(bus idle)

4.7

1.3

Note: It is obtained from a comprehensive evaluation and is not tested in production.

Figure 13 I2C Bus AC Waveform and Measurement 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

Note: The measuring points are set at CMOS levels: 0.3VDD and 0.7VDD .

5.10.2.

SPI peripheral characteristics

Table 39 SPI Characteristics (TA=25

℃, VDD=3.3V)

Symbol

Parameter

Conditions

Min

Max

Unit

fSCK

1/tc(SCK)

SPI clock frequency

Master mode

MHz

Slave mode

tr(SCK)

tf(SCK)

SI clock rise and fall time

Load capacitance: C = 30pF

tsu(NSS)

NSS setup time

Slave mode

4tPCLK

th(NSS)

NSS hold time

Slave mode

2tPCLK

tw(SCKH)

SCK high and low time

Main mode, fPCLK = 36MHz,

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