STR71XF datasheet(62/77 Pages) STMICROELECTRONICS

部件名	STR71XF

功能描述	ARM7TDMI??32-bit MCU with Flash, USB, CAN 5 timers, ADC, 10 communications interfaces

PDF	77 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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62 / 77 page

Electrical parameters

STR71xF

62/77

period of SCL signal.

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

fPCLK1, must be at least 8MHz to achieve max fast I

2C speed (400kHz).

The following table gives the values to be written in the I2CCCR register to obtain the required I2C SCL line

frequency.

Figure 33.

Typical Application with I2C Bus and Timing Diagram 4)

Legend:

RP = External pull-up resistance

fSCL = I

2C speed

NA = Not achievable

Note:

For speeds around 200 kHz, achieved speed can have

±5% tolerance

For other speed ranges, achieved speed can have

±2% tolerance

The above variations depend on the accuracy of the external components used.

Table 35.

SCL Frequency Table (fPCLK1=8 MHz.,V33 = 3.3 V)

fSCL

(kHz)

I2CCCR Value

RP=4.7kΩ

400

300

85h

200

8Ah

100

24h

4Ch

C4h

REPEATED START

START

STOP

START

tf(SDA)

tr(SDA)

tsu(SDA)

th(SDA)

tf(SCK)

tr(SCK)

tw(SCKL)

tw(SCKH)

th(STA)

tsu(STO)

tsu(STA)

tw(STO:STA)

SDA

SCL

4.7k

Ω

SDA

STR7

SCL

VDD

100

Ω

100

Ω

VDD

4.7k

Ω

I2CBUS

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