str712 STMicroelectronics, str712 Datasheet - Page 62

• Manufacturer Part Number: str712
• Description: 144/64-pin Arm7tdmi Mcu With Up To 256kb Flash, 64kb Ram And Emi
• Manufacturer: STMicroelectronics

Electrical parameters
62/78
Figure 33. Typical application with I
Table 37.
Legend:
R
f
NA = Not achievable
Note:
SCL
P
= External pull-up resistance
= I
2
C speed
SDA
SCL
For speeds around 200 kHz, achieved speed can have
For other speed ranges, achieved speed can have
The above variations depend on the accuracy of the external components used.
I
2
t
C BUS
f(SDA)
SCL Frequency Table (
t
h(STA)
START
(kHz)
f
400
300
200
100
SCL
50
20
4.7kΩ
t
w(SCKH)
t
r(SDA)
V
DD
t
w(SCKL)
4.7kΩ
V
DD
t
su(SDA)
f
PCLK1
t
r(SCK)
100Ω
100Ω
2
C bus and timing diagram
=8 MHz.,V
t
h(SDA)
t
f(SCK)
SDA
SCL
STR7
33
= 3.3 V)
±
I2CCCR Value
2% tolerance
R
±
P
=4.7kΩ
4Ch
C4h
8Ah
85h
24h
5% tolerance
t
su(STA)
83
t
su(STO)
t
w(STO:STA)
STOP
REPEATED START
STR71xF
START