EVAL-ADM1063LFEB AD [Analog Devices], EVAL-ADM1063LFEB Datasheet - Page 13

• Manufacturer Part Number: EVAL-ADM1063LFEB
• Description: Multisupply Supervisor/Sequencer with ADC and Temperature Monitoring
• Manufacturer: AD [Analog Devices]

INPUTS
SUPPLY SUPERVISION
The ADM1063 has 10 programmable inputs. Five of these are
dedicated supply fault detectors (SFDs). These dedicated inputs
are called VH and VP1 to VP4 by default. The other five inputs
are labeled VX1 to VX5 and have dual functionality. They can
be used as either SFDs with similar functionality to VH and
VP1 to VP4, or CMOS-/TTL-compatible logic inputs to the
devices. Therefore, the ADM1063 can have up to 10 analog
inputs, a minimum of five analog inputs and five 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 10 analog inputs has no digital inputs available.
Table 5 shows the details of each of the inputs.
VPn
PROGRAMMING THE SUPPLY FAULT DETECTORS
The ADM1063 can have up to 10 SFDs on its 10 input
channels. These highly programmable reset generators enable
the supervision of up to 10 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 (an undervoltage or overvoltage). The thresholds
can be programmed to an 8-bit resolution in registers provided
in the ADM1063. This translates to a voltage resolution that is
dependent on the range selected.
Table 5. Input Functions, Thresholds, and Ranges
Input
VH
VPn
VXn
ULTRA
LOW
LOW
MID
Function
High V analog input
Positive analog input
High Z analog input
Digital input
SELECT
RANGE
Figure 22. Supply Fault Detector Block
VREF
+
–
+
–
COMPARATOR
COMPARATOR
OV
UV
Voltage Range (V)
2.5 to 6.0
4.8 to 14.4
0.573 to 1.375
1.25 to 3.00
2.5 to 6.0
0.573 to 1.375
0 to 5
FAULT TYPE
SELECT
GLITCH
FILTER
FAULT
OUTPUT
Maximum Hysteresis
425 mV
1.16 V
97.5 mV
212 mV
425 mV
97.5 mV
N/A
Rev. 0 | Page 13 of 36
The resolution is given by
Therefore, if the high range is selected on VH, the step size can
be calculated as follows:
Table 4 lists the upper and lower limits of each available range,
the bottom of each range (V
Table 4. Voltage Range Limits
Voltage Range (V)
0.573 to 1.375
1.25 to 3.00
2.5 to 6.0
4.8 to 14.4
The threshold value required is given by
where:
V
V
N is the decimal value of the 8-bit code.
V
Reversing the equation, the code for a desired threshold is given by
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
Therefore, N = 182 (1011 0110 or 0xB6).
T
R
B
is the desired threshold voltage (UV or OV).
is the voltage range.
is the bottom of the range.
Step Size = Threshold Range/255
(14.4 V − 4.8 V)/255 = 37.6 mV
V
N = 255 × (V
N = 255 × (5 − 2.5)/3.5
T
= (V
R
× N)/255 + V
Voltage Resolution (mV)
13.7
37.6
3.14
6.8
13.7
3.14
N/A
AN-698
T
− V
B
)/V
application note) is given by
B
R
B
), and the range itself (V
V
0.573
1.25
2.5
4.8
B
(V)
Glitch Filter (µs)
0 to 100
0 to 100
0 to 100
0 to 100
0 to 100
0 to 100
0 to 100
ADM1063
V
0.802
1.75
3.5
9.6
R
R
(V)
).