tmp19a43fzxbg TOSHIBA Semiconductor CORPORATION, tmp19a43fzxbg Datasheet - Page 372

• Manufacturer Part Number: tmp19a43fzxbg
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

4.9 SBI Timing
(1)
SCL clock frequency
Hold time for START condition
Low period of the SCL clock (Note 1)
SCL clock high width
Setup time for a repeated START
condition
Data hold time(Input)(Note3,4)
Data setup time
Setup time for STOP condition
Bus free time between STOP and
START conditions
Note1: SCL clock low width (output) is calculated with (2 (n – 1) + 4)T.
Note2: SCL clock high width (output) is caluculated with (2 (n – 1))T.
Note3: The output data hold time is equal to 12X.
Note4: The Philips I2C-bus specification states that a device must internally provide a hold time of at
Note5: Software-dependent.
Note6: To operate the SBI in I2C Fast mode, the fysy frequency must be no less than 20 MHz. To
I2C mode
Parameter
least 300 ns for the SDA signal to bridge the undefined region of the fall edge of SCL.
However,TMP1942CY/CZ SBI does not satisfy this requirement. Also, the output buffer for SCL
does not incorporate slope control of the falling edges; therefore, the equipment manufacturer
should design so that the input data hold time shown in the table is satisfied, including tr/tf of the
SCL and SDA lines.
operate the SBI in I2C Standard mode, the fysy fewquency must be no less than 4 MHz.
The letter n denotes the value of n programmed into the SCK[2:0] (SCL output frequency select)
field in the SBI0CR1.
In the table below, the letters x and T represent the fsys and φT0 cycle periods, respectively.
SDA
SCL
S: START condition
Sr: Repeated START condition
P; STOP condition
S
t
HD;STA
t
f
Symbol
t
t
t
t
t
t
t
t
t
SCL
HD:STA
LOW
HIGH
SU;STA
HD;DAT
SU;DAT
SU;STO
BUF
t
LOW
t
SU;DAT
Standard mode: 6 μsec @ Typ (fsys = 8 MHz, n = 4)
Fast mode:
Standard mode: 4 μsec @ Typ (fsys = 8 MHz, n = 4)
Fast mode:
t
SCL
TMP1942CY/CZ-371
Software
Software
t
(Note 5)
(Note 5)
r
Min
0
Equation
t
HIGH
Max
t
HD;DAT
1.5μsec @ Typ (fsys = 32 MHz, n = 4)
1μsec @ Typ (fsys = 32 MHz, n = 4)
fsys = 8 MHz, n = 4
Standard Mode
Min
250
4.0
4.7
4.0
4.7
4.0
4.7
0
0
t
Max
SU;STA
100
Sr
TMP1942CY/CZ
fsys = 32 MHz, n = 4
Min
100
0.6
1.3
0.6
0.6
0.6
1.3
0
0
t
Fast Mode
SU;STO
P
Max
t
BUF
400
Unit
kHz
μs
μs
μs
μs
μs
ns
μs
μs