Datasheet

ADC081C021, ADC081C027
www.ti.com SNAS447C –FEBRUARY 2008–REVISED MARCH 2013
Alert Status Register
This register indicates if a high or a low threshold has been violated. The bits of this register are active high. That
is, a high indicates that the respective limit has been violated.
Pointer Address 01h (Read/Write)
Default Value: 00h
D7 D6 D5 D4 D3 D2 D1 D0
Reserved Over Range Under Range
Alert Alert
Bits Name Description
7:2 Reserved Always reads zeros. Zeros must be written to these bits.
1 Over Range Bit is set to 1 when the measured voltage exceeds the V
HIGH
limit stored in the programmable V
HIGH
Alert Flag limit register. Flag is reset to 0 when one of the following two conditions is met: (1) The controller writes
a one to this bit. (2) The measured voltage decreases below the programmed V
HIGH
limit minus the
programmed V
HYST
value (See Figure 27) . The alert will only self-clear if the Alert Hold bit is cleared in
the Configuration register. If the Alert Hold bit is set, the only way to clear an over range alert is to write
a one to this bit.
0 Under Range Bit is set to 1 when the measured voltage falls below the V
LOW
limit stored in the programmable V
LOW
Alert Flag limit register. Flag is reset to 0 when one of the following two conditions is met: (1) The controller writes
a one to this bit. (2) The measured voltage increases above the programmed V
LOW
limit plus the
programmed V
HYST
value. The alert will only self-clear if the Alert Hold bit is cleared in the
Configuration register. If the Alert Hold bit is set, the only way to clear an under range alert is to write a
one to this bit.
Configuration Register
Pointer Address 02h (Read/Write)
Default Value: 00h
D7 D6 D5 D4 D3 D2 D1 D0
Cycle Time [2:0] Alert Hold Alert Flag Enable Alert Pin Enable 0 Polarity
Cycle Time[2:0] Conversion Typical f
convert
Interval (ksps)
D7 D6 D5
0 0 0 Mode Disabled 0
0 0 1 T
convert
x 32 27
0 1 0 T
convert
x 64 13.5
0 1 1 T
convert
x 128 6.7
1 0 0 T
convert
x 256 3.4
1 0 1 T
convert
x 512 1.7
1 1 0 T
convert
x 1024 0.9
1 1 1 T
convert
x 2048 0.4
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