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AMC7812B_14 Datasheet, PDF (68/93 Pages) Texas Instruments – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors
AMC7812B
SBAS625A – SEPTEMBER 2013 – REVISED SEPTEMBER 2013
www.ti.com
Alarm Control Register (Read or Write, Address = 4Eh, Default = 0000h)
The alarm control register determines whether the ALARM pin is accessed when a corresponding alarm event
occurs. However, this register does not affect the status bit in the status register. Note that the thermal alarm is
always enabled. When the THERM_ALR bit is '1', the ALARM pin goes low if the pin is enabled.
Table 21. Alarm Control Register
BIT
NAME
DEFAULT
15
—
0
14
EALR-CH0
0
13
EALR-CH1
0
12
EALR-CH2
0
11
EALR-CH3
0
10 EALR-LT-Low
0
9 EALR-LT-High
0
8 EALR-D1-Low
0
7 EALR-D1-High
0
6 EALR-D2-Low
0
5 EALR-D2-High
0
R/W
DESCRIPTION
R Reserved. Writing to this bit causes no change. Reading this bit returns '0'.
CH0 and (CH0+, CH1–) alarm enable bit.
0 = The alarm is masked. When the input of CH0 or (CH0+, CH1–) is out of range, the
R/W ALARM pin does not go low, but the CH0-ALR bit is set.
1 = The alarm is enabled, the CH0-ALR bit is set, and the ALARM pin goes low (if enabled)
when the input of CH0 or (CH0+, CH1–) is out of range.
CH1 alarm enable bit.
0 = The alarm is masked. When the input of CH1 is out of range, the ALARM pin does not
R/W go low, but the CH1-ALR bit is set.
1 = The alarm is enabled, the CH1-ALR bit is set, and the ALARM pin goes low (if enabled)
when the input of CH1 is out of range.
CH2 and (CH2+, CH3–) alarm enable bit.
0 = The alarm is masked. When the input of CH2 or (CH2+, CH3–) is out of range, the
R/W ALARM pin does not go low, but the CH2-ALR bit is set.
1 = The alarm is enabled, the CH2-ALR bit is set, and the ALARM pin goes low (if enabled)
when the input of CH2 or (CH2+, CH3–) is out of range.
CH3 alarm enable bit.
0 = The alarm is masked. When the input of CH3 is out of range, the ALARM pin does not
R/W go low, but the CH3-ALR bit is set.
1 = The alarm is enabled, the CH3-ALR bit is set, and the ALARM pin goes low (if enabled)
when the input of CH3 is out of range.
Local sensor low alarm enable bit.
0 = The LT-Low alarm is masked. When LT is below the specified range, the ALARM pin
R/W does not go low, but the LT-Low-ALR bit is set.
1 = The LT-Low alarm is enabled. When LT is below the specified range, the LT-Low-ALR
bit is set ('1') and the ALARM pin goes low (if enabled).
Local sensor high alarm enable bit.
0 = The LT-High alarm is masked. When LT is above the specified range, the ALARM pin
R/W does not go low, but the LT-High-ALR bit is set.
1 = The LT-High alarm is enabled. When LT is above the specified range, the LT-High-ALR
bit is set ('1') and the ALARM pin goes low (if enabled).
D1 low alarm enable bit.
0 = The D1-Low alarm is masked. When D1 is below the specified range, the ALARM pin
R/W does not go low, but the D1-Low-ALR bit is set.
1 = The D1-Low alarm is enabled. When D1 is below the specified range, the D1-Low-ALR
bit is set ('1'), and the ALARM pin goes low (if enabled).
D1 high alarm enable bit.
0 = The D1-High alarm is masked. When D1 is above the specified range, the ALARM pin
R/W does not go low, but the D1-High-ALR bit is set.
1 = The D1-High alarm is enabled. When D1 is above the specified range, the D1-High-
ALR bit is set ('1'), and the ALARM pin goes low (if enabled).
D2 low alarm enable bit.
0 = The D2-Low alarm is masked. When D2 is below the specified range, the ALARM pin
R/W does not go low, but the D2-Low-ALR bit is set.
1 = The D2-Low alarm is enabled. When D2 is below the specified range, the D2-Low-ALR
bit is set ('1'), and the ALARM pin goes low (if enabled).
D2 high alarm enable bit.
0 = The D2-High alarm is masked. When D2 is above the specified range, the ALARM pin
R/W does not go low, but the D2-High-ALR bit is set.
1 = The D2-High alarm is enabled. When D2 is above the specified range, the D2-High-
ALR bit is set ('1'), and the ALARM pin goes low (if enabled).
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