STRT71XF datasheet(61/74 Pages) STMICROELECTRONICS

部件名	STRT71XF

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

PDF	74 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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61 / 74 page

STR71xF

Electrical parameters

61/74

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 I

2C 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.

USB Characteristics

The USB interface is USB-IF certified (Low Speed and Full Speed).

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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