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ADM1068ACP-REEL Scheda tecnica(PDF) 11 Page - Analog Devices

Il numero della parte ADM1068ACP-REEL
Spiegazioni elettronici  Super Sequencer??and Monitor
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Homepage  http://www.analog.com
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ADM1068ACP-REEL Scheda tecnica(HTML) 11 Page - Analog Devices

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Preliminary Technical Data
ADM1068
Rev. PrB | Page 11 of 28
INPUTS
SUPPLY SUPERVISION
The ADM1068 has eight programmable inputs. Four of these
are dedicated supply fault detectors (SFDs). These dedicated
inputs are called VH and VP1–3 by default. The other four
inputs are labeled VX1–VX4 and have dual functionality. They
can be used as either supply fault detectors, with similar
functionality to VH and VP1–3, or CMOS/TTL-compatible
logic inputs to the devices. Therefore, the ADM1068 can have
up to eight analog inputs, a minimum of four analog inputs and
four digital inputs, or a combination. If an input is used as an
analog input, it cannot be used as a digital input. Therefore, a
configuration requiring eight analog inputs has no digital inputs
available. Table 5 shows the details of each of the inputs.
+
+
UV
COMPARATOR
VREF
FAULT TYPE
SELECT
OV
COMPARATOR
FAULT
OUTPUT
GLITCH
FILTER
VPn
MID
LOW
RANGE
SELECT
ULTRA
LOW
Figure 15. Supply Fault Detector Block
PROGRAMMING THE SUPPLY FAULT DETECTORS
The ADM1068 has up to eight supply fault detectors (SFDs) on
its eight input channels. These highly programmable reset
generators enable the supervision of up to eight supply voltages.
The supplies can be as low as 0.573 V and as high as 14.4 V. The
inputs can be configured to detect an undervoltage fault (the
input voltage droops below a preprogrammed value), an
overvoltage fault (the input voltage rises above a
preprogrammed value) or an out-of-window fault
(undervoltage or overvoltage). The thresholds can be
programmed to an 8-bit resolution in registers provided in the
ADM1068. This translates to a voltage resolution that is
dependent on the range selected.
The resolution is given by
Step Size = Threshold Range/255
Therefore, if the high range is selected on VH, the step size can
be calculated as follows:
(14.4 V − 4.8 V)/255 = 37.6 mV
Table 4 lists the upper and lower limit of each available range,
the bottom of each range (VB), and the range itself (VR).
Table 4. Voltage Range Limits
Voltage Range (V)
VB (V)
VR (V)
0.573 to 1.375
0.573
0.802
1.25 to 3.00
1.25
1.75
2.5 to 6.0
2.5
3.5
4.8 to 14.4
4.8
9.6
The threshold value required is given by
VT = (VR × N)/255 + VB
where:
VT is the desired threshold voltage (UV or OV).
VR is the voltage range.
N is the decimal value of the 8-bit code.
VB is the bottom of the range.
Reversing the equation, the code for a desired threshold is
given by
N = 255 × (VT − VB)/VR
For example, if the user wants to set a 5 V OV threshold on VP1,
the code to be programmed in the PS1OVTH register
(discussed in the AN-698 application note) is given by
N = 255 × (5 − 2.5)/3.5
Therefore, N = 182 (1011 0110 or 0xB6).
Table 5. Input Functions, Thresholds, and Ranges
Input
Function
Voltage Range (V)
Maximum Hysteresis
Voltage Resolution (mV)
Glitch Filter (µs)
VH
High V Analog Input
2.5–6.0
425 mV
13.7
0–100
4.8–14.4
1.16 V
37.6
0–100
VPn
Positive Analog Input
0.573–1.375
97.5 mV
3.14
0–100
1.25–3.00
212 mV
6.8
0–100
2.5–6.0
425 mV
13.7
0–100
VXn
High Z Analog Input
0.573–1.375
97.5 mV
3.14
0–100
Digital Input
0–5
N/A
N/A
0–100


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