ADM1063ASU datasheet(13/36 Pages) AD

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ADM1063

Rev. 0 | Page 13 of 36

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.

–

COMPARATOR

VREF

FAULT TYPE

SELECT

COMPARATOR

FAULT

OUTPUT

GLITCH

FILTER

VPn

MID

LOW

RANGE

SELECT

ULTRA

LOW

Figure 22. Supply Fault Detector Block

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.

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 limits 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)

High V analog input

2.5 to 6.0

425 mV

13.7

0 to 100

4.8 to 14.4

1.16 V

37.6

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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