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This commodity will attending at the best important appearance of the TLV7031 which is a nanoPower comparator from Texas Instruments. Two accessible applications for this low-power accessory will be briefly discussed.

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The TLV7031 has a quiescent accumulation accepted of 335 nA and its ascribe bent accepted is 2 pA. The nanoPower accessory exhibits a advancement adjournment of 3 abnormal and is provided in the tiny bales apparent in Figure 1. The accessory is adequate for space-critical designs like smartphones. Additionally, the accessory can be acclimated in actual low-power applications that crave nanoPower: beginning detectors, IR receivers, etc.

The anatomic block diagram of the TLV7031 is apparent in Figure 2.

The accessory incorporates a rail-to-rail ascribe date that can acquire a common-mode amount from $$V_{EE}$$ to 100 mV aloft $$V_{CC}$$. The ascribe bent accepted is about 2 pA. Even back the accessory is not powered or its accumulation is ramping up, the ascribe still exhibits a aerial impedance.

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The TLV7031 has a push-pull achievement but its sister device, the TLV7041, provides an open-drain output. The open-drain achievement agreement could be acclimated to change the voltage akin apery the argumentation aerial at the accessory output. This can be done by affairs the achievement to an alien accumulation abuse absolute from the accessory accumulation voltage. The open-drain affection could additionally be acclimated to affix the achievement of several TLV7041s calm to anatomy a wired-OR argumentation gate.

The accumulation voltage of the TLV7031 ranges from 1.6 V to 6.5 V. The block diagram in Figure 2 shows that the accessory has a “Power-on-reset” (POR) bore that is affiliated to the accessory “Bias” circuit. If the accumulation voltage goes beneath the minimum adequate value, i.e. 1.6 V, the POR ambit gets activated and sets the achievement of the TLV7031 to argumentation low. For a TLV7041 device, the achievement will be aerial impedance back the POR ambit is activated. Note that these comparators accept a power-up time of $$t_{ON}=200 ; mu s$$. Hence, during power-up, the accumulation voltage charge be aloft 1.6 V for about $$200 ; mu s$$ afore the comparator achievement can aftermath a accurate result. This is apparent in Figure 3. In this archetype waveform, we accept $$V_{IN } > V_{IN-}$$.

Now, let’s attending at two archetype applications for these nanoPower comparators.

Infrared (IR) advice can be an absorbing band-aid back there’s a line-of-sight aisle amid the transmitter and the receiver. This advice address is not alone bargain but additionally accustomed to RF interference. These advantages accomplish the IR advice adequate for applications such as hermetically closed account metering. In this application, aspersing the arrangement ability burning can advice us to access the array activity and, consequently, abate the amount of maintenance. To abbreviate the ability consumption, we can use the arrangement depicted in Figure 4. The low-power analog advanced end (AFE) is consistently powered but the host microcontroller (MCU) is in the shut-down ability state. Back a accurate IR arresting is received, the AFE wakes up the MCU.

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The ambit accomplishing of the abstraction apparent aloft is depicted in Figure 5.

This circuit, presented by TI, uses an IR LED emitter instead of a receiver to abate amount at the amount of sensitivity.  When IR ablaze strikes the LED, the photoelectric aftereffect frees electrons in the LED, creating a current.

The accepted induced by the adventure IR ablaze goes through resistor R1  and generates a voltage signal. This voltage is activated to the inverting ascribe of the TLV7031. R2 and C1 anatomy a lowpass clarify which determines the beggarly amplitude of the adventure IR signal. This beggarly amount is affiliated to the non-inverting ascribe of the comparator through the R3 resistor. In fact, the RC arrangement gives us a beginning that automatically adapts to the ambient ablaze level.

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The absolute acknowledgment bend formed by R4 and R3 produces a hysteresis aftereffect in accession to the centralized hysteresis of the TLV7031 (See the datasheet for added details). The hysteresis prevents the achievement from affected toggles. The waveforms for the IR receiver AFE are apparent in Figure 6.

Figure 41 of the accessory datasheet gives the afterward waveforms for the IR receiver AFE. Note that this ambit is not actual because $$V_{OUT}$$ charge accept a appearance about-face of $$180^{circ}$$ about to the $$V_{IN}$$ arresting apparent in Figure 5.

For the IR receiver AFE, two appearance of the TLV7031 are important:

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The aboriginal affection allows us to accept a nanoPower comparator. The additional one allows us to access the amount of R1 after sacrificing linearity. Consequently, a beyond R1 leads to a abate accumulation accepted fatigued by the LED-R1 branch.

As apparent in Figure 8, we can use two TLV7041 accessories to authorize a window comparator.

This ambit creates two thresholds appliance a arresting voltage affiliate formed by the R1, R2, and R3 network. The low beginning activated to the inverting ascribe of the the lower TLV7041 is

$$V_{th, low}= frac{R_3}{R_1 R_2 R_3}times 3.3 ; V$$

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The aerial beginning activated to the non-inverting ascribe of the aerial comparator is

$$V_{th, high}= frac{R_2 R_3}{R_1 R_2 R_3}times 3.3 ; V$$

We accept three cases:

Therefore, back an undervoltage or an overvoltage action occurs, the achievement of the window comparator is set to argumentation low and the microcontroller is alerted. Note that the open-drain affection of the TLV7041 accustomed us to cautiously affix the achievement of the two accessories together.

Another absorbing appliance for the TLV7041 accessory is in headphone jack detection. See this  TI certificate for details.

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In this article, we looked at some of the important appearance of the TLV7031 and TLV7041. We additionally briefly discussed two appliance examples for these comparators. If you accept any acquaintance with these comparators or added agnate parts, amuse let us apperceive in the comments below.

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