Rainbow-electronics MAX16043 Manual do Utilizador descarregar pdf (Página 10)

MAX16041/MAX16042/MAX16043

The following equation is provided to help estimate the

value of the resistors based on the amount of acceptable

error:

where e

is the fraction of the maximum acceptable

absolute resistive divider error attributable to the input

leakage current (use 0.01 for ±1%), V

INTH

is the voltage

at which the output (OUT_) should assert, and I

is the

worst-case IN_ leakage current (see the

Electrical

Characteristics

). Calculate R2 as follows:

Unused Inputs

Connect any unused IN_ and EN_ inputs to V

OUT_ Output

The MAX16041/MAX16042/MAX16043 feature open-drain

outputs. An OUT_ goes low when its respective IN_ input

voltage drops below its specified threshold or when its

EN_ goes low (see Table 1). OUT_ goes high when EN_

is high and V

IN_

is above its threshold after a time delay.

Open-drain outputs require an external pullup resistor to

any voltage from 0 to 28V.

RESET

Output

RESET asserts low when any of the monitored voltages

(IN_) falls below its respective threshold, any EN_ goes

low, or MR is asserted. RESET remains asserted for the

reset timeout period after all of the monitored voltages

exceed their respective thresholds, all EN_ are high, all

OUT_ are high, and MR is deasserted. All devices have

a push-pull, active-low reset output.

INTH TH

−

A INTH

1 =

Dual-/Triple-/Quad-Voltage, Capacitor-

Adjustable, Sequencing/Supervisory Circuits

10 ______________________________________________________________________________________

IN_

INTH

R1 = R2 x

(

)

INTH

MAX16041

MAX16042

MAX16043

-1

Figure 3. Setting the Adjustable Input

Table 1. Output State*

EN_ IN_ OUT_

Low V

IN_

< V

Low

High V

IN_

< V

Low

Low V

IN_

> V

Low

High V

IN_

> V

OUT_ = high impedance

When V

falls below the UVLO, all outputs go low regardless

of the state of EN_ and V

IN_

. The outputs are guaranteed to be

in the correct state for V

down to 1.2V.

Table 2. Input-Voltage Threshold Selector

TH1/TH0

LOGIC

IN1 (ALL

VERSIONS)

(V)

IN2 (ALL

VERSIONS)

(V)

IN3

(MAX16042)

(V)

IN4

(MAX16043)

(V)

Low/Low 3.3 2.5 1.8 1.5

Low/High 3.3 1.8 Adj Adj

Low/Open 3.3 1.5 Adj Adj

High/Low 3.3 1.2 1.8 2.5

High/High 2.5 1.8 Adj Adj

High/Open 3.3 Adj 2.5 Adj

Open/Low 3.3 Adj Adj Adj

Open/High 2.5 Adj Adj Adj

Open/Open Adj Adj Adj Adj

1 2 ... 5 6 7 8 9 10 11 12 13 14 15

MAX16041/MAX16042/MAX16043 1

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