IL33197 datasheet(5/5 Pages) INTEGRAL

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IL33197

The following table summarizes all T1 debounce timings:

Condition

Debounce Time

INT Active

4 x tb1 to 2 x 4 x tb1

INT Inactive

4 x tb1 to 2 x 4 x tb1

W/W Active When INT Inactive

4 x tb1 to 2 x 4 x tb1

W/W Active When INT Active During T3

4 x tb1 to 2 x 4 x tb1

W/W Active When INT Active During T4

4 x tb2 to 2 x 4 x tb2

Two IL33197A Devices Using One Decoupling Resistor and Capacitor

Two devices may be connected to the power source using a common R1 resistor for protection against

overvoltages. If this is done it should be noted that the current flowing through R1 is increased and hence

the voltage drop across R1 is increased.

Overvoltage Protection

In reference to the Block Diagram and Typical Application, all of the foregoing operational cases

require: R1

≥ 100 Ω, C1 ≥ 47 µF

≥ 1.0 kΩ, R4 ≥ 4.7 kΩ, R5 ≥ 4.7 kΩ

The circuit will not operate during the transient conditions. By using the above component values, the

circuit will be able to sustain the following overvoltages on Vbb without permanent damage: 1. +28 V for 5

minutes 2. –15 V for 5 minutes 3. –16 V cycled off for 1.0 minute 4. +80 V pulse decaying exponentially to

8.0 V in 400 ms repeated 3 times at 1.0 minute intervals.

5. 

±300 V pulse decaying exponentially to 30 V in 300 ms with a maximum energy of 1.0 Joule.

±100 V pulse decaying exponentially to 10 V in 2 ms.

Recommended External Component Values

Below are the recommended component values to ensure the device will operate properly, and that all

specified parameters will stay within their tolerances.

R1 should be greater than 100

Ω; recommended value of 220 Ω. R1 can be up to 500 Ω, but in this

case the tb2v parameter could be out of it’s specified value (see Electrical Characteristics and Note 1).

Also, the minimum operating voltage range should be greater than 8.0 V. The following values should be

adhered to:

10 k

Ω ≤ R2 ≤ 68 kΩ; 1.5 kΩ ≤ R3 ≤ 47 kΩ; R4 ≥ 4.7 kΩ; R5 ≥ 4.7 kΩ; C1 ≥ 47 uF; 47 nF ≥ C2 ≥ 470 nF

Application Information

The following is an example of timing calculations using the following external components values:

R2 = 22 k

Ω, R3 = 2.2 kΩ, C2 = 100 nF (Referring to Block Diagram and Typical Application).

Oscillator Time Base Calculation:

tb1 duration = tb1 x 4 x R2 x C2 = 1 x 4 x 27e3 x 100e–9 = 10.8 ms;

tb2 duration_g (INT to Gnd) = tb2g x R3 x C2 = 15.5 x 2.2e3 x 100e–9 = 3.41 ms

tb2 duration_v (INT to Vbb) =

tb2v x R3 x C2 = 12.1 x 2.2e3 x 100e–9 = 2.66 ms

Intermittent timing calculation:

T3 = 16 x 4 x tb1 duration = 16 x 4 x 10.8 ms = 691 ms

T4 = 144 x 4 x tb2 duration_g = 144 x 4 x 3.41 ms = 1.96 s (INT connected to Gnd)

T4 = 144 x 4 x tb2 duration_v = 144 x 4 x 2.66 ms = 1.53 s (INT connected to Vbb)

Wash wipe timing calculation:

T2 = 96 x 4 x tb1 = 96 x 4 x 10.8 ms = 4.15 s

T1 Debounce Time Calculation (see T1 Debounce Timing)

When oscillator is oscillating at tb1:

T1 minimum = 4 x tb1 = 4 x 10.8 ms = 43.2 ms

T1 maximum = 2 x 4 x tb1 = 2 x 4 x 10.8 ms = 86.4 ms

When oscillator is oscillating at tb2: T1 minimum (INT connected to Gnd, tb2g) = 4 x tb2 = 4 x 3.41 ms =

13.6 ms T1 maximum (INT connected to Gnd, tb2g) = 2 x 4 x tb2 = 2 x 4 x 3.41 ms = 27.3 ms

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