adc081c027cimkx National Semiconductor Corporation, adc081c027cimkx Datasheet - Page 17

• Manufacturer Part Number: adc081c027cimkx
• Description: I2c-compatible, 12-bit Analog-to-digital Converter Adc With Alert Function
• Manufacturer: National Semiconductor Corporation

1.6.4 Configuration Register
Pointer Address 02h (Read/Write)
Default Value: 00h
1.6.5 V
This register holds the lower limit threshold used to determine the alert condition. If the conversion moves lower than this limit, a
V
Pointer Address 03h (Read/Write)
Default Value: 0000h
Cycle Time [2:0]
Bits
7:5
4
3
2
1
0
Bits
15:12
11:4
3:0
D7
D7
LOW
0
Cycle Time[2:0]
D15
alert is generated.
D7
D6
LOW
D6
0
Name
Cycle Time
Alert Hold
Alert Flag Enable
Alert Pin Enable
Reserved
Polarity
Name
Reserved
V
Reserved
LOW
-- Alert Limit Register - Under Range
D5
Limit
D5
0
Alert
Hold
D4
D14
D6
V
LOW
Enable
Reserved
Alert
Flag
D3
Mode Disabled
Conversion
Limit [3:0]
Interval
Description
Configures Automatic Conversion mode. When these bits are set to zeros, the automatic
conversion mode is disabled. This is the case at power-up.
When these bits are set to a non-zero value, the ADC will begin operating in automatic conversion
mode. (See Section 1.9 AUTOMATIC CONVERSION MODE). The Cycle Time table shows how
different values provide various conversion intervals.
0: Alerts will self-clear when the measured voltage moves within the limits by more than the
hysteresis register value.
1: Alerts will not self-clear and are only cleared when a one is written to the alert high flag or the
alert low flag in the Alert Status register.
0: Disables alert status bit [D15] in the Conversion Result register.
1: Enables alert status bit [D15] in the Conversion Result register.
0: Disables the ALERT output pin. The ALERT output will TRI-STATE when the pin is disabled.
1: Enables the ALERT output pin.
*This bit does not apply to the ADC081C027.
Always reads zeros. Zeros must be written to these bits.
This bit configures the active level polarity of the ALERT output pin.
0: Sets the ALERT pin to active low.
1: Sets the ALERT pin to active high.
*This bit does not apply to the ADC081C027.
Description
Always reads zeros. Zeros must be written to these bits.
Sets the lower limit threshold used to determine the alert condition. If the conversion moves lower
than this limit, a V
Always reads zeros. Zeros must be written to these bits.
Enable
Alert
Pin
D2
D13
D5
D1
0
LOW
Typical
f
(ksps)
Polarity
convert
D12
D4
0
D0
alert is generated.
17
0
0
0
1
1
1
1
D11
D3
0
1
1
0
0
1
1
1
0
1
0
1
0
1
D10
D2
V
LOW
Reserved
Limit [7:4]
T
T
T
T
T
T
T
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D9
D1
x 1024
x 2048
x 128
x 256
x 512
x 32
x 64
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D8
D0
13.5
6.7
3.4
1.7
0.9
0.4
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