ADCPWDN/
ADCBGPWD/
ADCREFPWD/
ADCENABLE
Request for ADC
Conversion
t
d(PWD)
87
TMS320F28069, TMS320F28068, TMS320F28067, TMS320F28066
TMS320F28065, TMS320F28064, TMS320F28063, TMS320F28062
www.ti.com
SPRS698F – NOVEMBER 2010 – REVISED MARCH 2016
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Detailed Description
Copyright © 2010–2016, Texas Instruments Incorporated
Table 6-28. ADC Power Modes
ADC OPERATING MODE
CONDITIONS
I
DDA
UNIT
Mode A – Operating Mode
ADC Clock Enabled
Bandgap On (ADCBGPWD = 1)
Reference On (ADCREFPWD = 1)
ADC Powered Up (ADCPWDN = 1)
16
mA
Mode B – Quick Wake Mode
ADC Clock Enabled
Bandgap On (ADCBGPWD = 1)
Reference On (ADCREFPWD = 1)
ADC Powered Up (ADCPWDN = 0)
4
mA
Mode C – Comparator-Only Mode
ADC Clock Enabled
Bandgap On (ADCBGPWD = 1)
Reference On (ADCREFPWD = 0)
ADC Powered Up (ADCPWDN = 0)
1.5
mA
Mode D – Off Mode
ADC Clock Enabled
Bandgap On (ADCBGPWD = 0)
Reference On (ADCREFPWD = 0)
ADC Powered Up (ADCPWDN = 0)
0.075
mA
(1)
The temperature sensor slope and offset are given in terms of ADC LSBs using the internal reference of the ADC. Values must be
adjusted accordingly in external reference mode to the external reference voltage.
(2)
ADC temperature coeffieicient is accounted for in this specification
(3)
Output of the temperature sensor (in terms of LSBs) is sign-consistent with the direction of the temperature movement. Increasing
temperatures will give increasing ADC values relative to an initial value; decreasing temperatures will give decreasing ADC values
relative to an initial value.
6.9.2.1.3.1 Internal Temperature Sensor
Table 6-29. Temperature Sensor Coefficient
PARAMETER
(1)
MIN
TYP
MAX
UNIT
T
SLOPE
Degrees C of temperature movement per measured ADC LSB change of the
temperature sensor
0.18
(2) (3)
°C/LSB
T
OFFSET
ADC output at 0°C of the temperature sensor
1750
LSB
(1)
Timings maintain compatibility to the ADC module. The 2806x ADC supports driving all 3 bits at the same time t
d(PWD)
ms before first
conversion.
6.9.2.1.3.2 ADC Power-Up Control Bit Timing
Table 6-30. ADC Power-Up Delays
PARAMETER
(1)
MIN
MAX
UNIT
t
d(PWD)
Delay time for the ADC to be stable after power up
1
ms
Figure 6-23. ADC Conversion Timing