LM3S1G21 Datasheet, PDF (911/955 Pages) Texas Instruments – Stellaris® LM3S1G21 Microcontroller

Stellaris^® LM3S1G21 Microcontroller
Figure 21-22. ADC Input Equivalency Diagram
VDD
ESD
Clamp
R_ADC
V_IN
ESD
Clamp
I_L
Stellaris® Microcontroller
12-bit
converter
C_ADC
Sample and hold
ADC converter
21.15
Table 21-26. ADC Module External Reference Characteristics^a
Parameter Parameter Name
Min
External voltage reference for ADC, when the VREF field 2.97
in the ADCCTL register is 0x1^b
V_REFA
External voltage reference for ADC, when the VREF field
0.99
in the ADCCTL register is 0x3^c
I_L
External voltage reference leakage current
-
a. Care must be taken to supply a reference voltage of acceptable quality.
b. Ground is always used as the reference level for the minimum conversion value.
c. Ground is always used as the reference level for the minimum conversion value.
Nom
-
-
-
Table 21-27. ADC Module Internal Reference Characteristics
Parameter
V_REFI
Parameter Name
Internal voltage reference for ADC
Min
Nom
-
3.0
Synchronous Serial Interface (SSI)
Max
3.03
1.01
2.0
Max
-
Unit
V
V
µA
Unit
V
Table 21-28. SSI Characteristics
Parameter
No.
S1
S2
S3
S4
S5
S6
S7
S8
Parameter Parameter Name
Min Nom Max
T_{CLK_PER}
SSIClk cycle time^a
40
-
-
T_{CLK_HIGH}
SSIClk high time
-
0.5
-
T_{CLK_LOW}
T_CLKRF
SSIClk low time
SSIClk rise/fall time^b
-
0.5
-
-
4
6
T_DMD
Data from master valid delay time
0
-
1
T_DMS
Data from master setup time
1
-
-
T_DMH
Data from master hold time
2
-
-
T_DSS
Data from slave setup time
1
-
-
Unit
ns
t clk_per
t clk_per
ns
system clocks
system clocks
system clocks
system clocks
January 22, 2012
911
Texas Instruments-Production Data