LM3S5G51 Datasheet, PDF (1201/1266 Pages) Texas Instruments – Stellaris® LM3S5G51 Microcontroller

Stellaris^® LM3S5G51 Microcontroller
Table 25-26. I²C Characteristics (continued)
Parameter
No.
Parameter Parameter Name
Min Nom Max
Unit
I4^a
T_DH
Data hold time
2
-
-
system clocks
I5^c
T_SFT
I2CSCL/I2CSDA fall time (V_IH =2.4 V
-
9
10
ns
to V _IL =0.5 V)
I6^a
T_HT
Clock High time
24
-
-
system clocks
I7^a
T_DS
Data setup time
18
-
-
system clocks
I8^a
T_SCSR
Start condition setup time (for
repeated start condition only)
36
-
-
system clocks
I9^a
T_SCS
Stop condition setup time
24
-
-
system clocks
a. Values depend on the value programmed into the TPR bit in the I²C Master Timer Period (I2CMTPR) register; a TPR
programmed for the maximum I2CSCL frequency (TPR=0x2) results in a minimum output timing as shown in the table
above. The I ²C interface is designed to scale the actual data transition time to move it to the middle of the I2CSCL Low
period. The actual position is affected by the value programmed into the TPR; however, the numbers given in the above
values are minimum values.
b. Because I2CSCL and I2CSDA are open-drain-type outputs, which the controller can only actively drive Low, the time
I2CSCL or I2CSDA takes to reach a high level depends on external signal capacitance and pull-up resistor values.
c. Specified at a nominal 50 pF load.
Figure 25-17. I²C Timing
I2
I6
I5
I2CSCL
I1
I4
I7
I8 I3
I9
I2CSDA
25.16 Inter-Integrated Circuit Sound (I²S) Interface
Table 25-27. I²S Master Clock (Receive and Transmit)
Parameter No.
M1
M2
M3
M4
M5
M6
Parameter
T_{MCLK_PER}
T_MCLKRF
T_{MCLK_HIGH}
T_{MCLK_LOW}
T_MDC
T_MJITTER
Parameter Name
Cycle time
Rise/fall time
High time
Low time
Duty cycle
Jitter
Min
Nom
Max
20.3
-
-
See “Input/Output
Characteristics” on page 1196.
10
-
-
10
-
-
48
-
52
-
-
2.5
Table 25-28. I²S Slave Clock (Receive and Transmit)
Parameter No.
M7
M8
M9
M10
Parameter
T_{SCLK_PER}
T_{SCLK_HIGH}
T_{SCLK_LOW}
T_SDC
Parameter Name
Cycle time
High time
Low time
Duty cycle
Min
Nom
Max
80
-
-
40
-
-
40
-
-
-
50
-
Unit
ns
ns
ns
ns
%
ns
Unit
ns
ns
ns
%
January 23, 2012
Texas Instruments-Production Data
1201