LM3S5D56 Datasheet, PDF (1087/1146 Pages) Texas Instruments – Stellaris® LM3S5D56 Microcontroller

Stellaris^® LM3S5D56 Microcontroller
Table 24-26. 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 24-17. I²C Timing
I2
I6
I5
I2CSCL
I1
I4
I7
I8 I3
I9
I2CSDA
24.16
24.17
Universal Serial Bus (USB) Controller
The Stellaris^® USB controller electrical specifications are compliant with the Universal Serial Bus
Specification Rev. 2.0 (full-speed and low-speed support) and the On-The-Go Supplement to the
USB 2.0 Specification Rev. 1.0. Some components of the USB system are integrated within the
LM3S5D56 microcontroller and specific to the Stellaris microcontroller design. An external component
resistor is needed as specified in Table 24-27.
Table 24-27. USB Controller Characteristics
Parameter
Parameter Name
Value
Unit
R_UBIAS
Value of the pull-down resistor on the USB0RBIAS pin
9.1K ± 1 %
Ω
Analog Comparator
Table 24-28. Analog Comparator Characteristics
Parameter
V_INP,V_INN
V_CM
V_OS
Parameter Name
Input voltage range
Input common mode voltage range
Input offset voltage
Min
Nom
Max
GND
-
V_DD
GND
-
V_DD-1.5
-
±10
±25
Unit
V
V
mV
January 23, 2012
Texas Instruments-Production Data
1087