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| 型号： | ADM1069AST-REEL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 电源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP32 |
| 封装： | MS-026-BBA, LQFP-32 |
| 文件页数： | 5/36页 |
| 文件大小： | 763K |
| 代理商： | ADM1069AST-REEL7 |
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ADM1069
Rev. A | Page 13 of 36
INPUTS
SUPPLY SUPERVISION
The ADM1069 has eight programmable inputs. Four of these
are dedicated supply fault detectors (SFDs). These dedicated
inputs are called VH and VPn (VP1 to VP3) by default. The
other four inputs are labeled VXn (VX1 to VX4) and have dual
functionality. They can be used as either supply fault detectors,
with similar functionality as VH and VPn, or CMOS-/TTL-
compatible logic inputs to the device. Therefore, the ADM1069
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
available digital inputs. Table 6 shows the details of each input.
04735-
023
+
–
+
–
UV
COMPARATOR
VREF
FAULT TYPE
SELECT
OV
COMPARATOR
FAULT
OUTPUT
GLITCH
FILTER
VPn
MID
LOW
RANGE
SELECT
ULTRA
LOW
Figure 21. Supply Fault Detector Block
PROGRAMMING THE SUPPLY FAULT DETECTORS
The ADM1069 has up to eight supply fault detectors (SFDs) on
its eight input channels. These highly programmable reset gen-
erators 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 drops 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 ADM1069. 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 6.0 V)/255 = 32.9 mV
Table 5 lists the upper and lower limit of each available range,
the bottom of each range (VB), and the range itself (VR).
Table 5. 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
6.0 to 14.4
6.0
8.4
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-721 Application Note) is given by
N = 255 × (5 2.5)/3.5
Therefore, N = 182 (1011 0110 or 0xB6).
Table 6. 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 to 6.0
425 mV
13.7
0 to 100
6.0 to 14.4
1.02 V
32.9
0 to 100
VPn
Positive Analog Input
0.573 to 1.375
97.5 mV
3.14
0 to 100
1.25 to 3.00
212 mV
6.8
0 to 100
2.5 to 6.0
425 mV
13.7
0 to 100
VXn
High Z Analog Input
0.573 to 1.375
97.5 mV
3.14
0 to 100
Digital Input
0 to 5
N/A
0 to 100
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