TC1041 Datasheet, PDF(4/14 Page) Microchip Technology – Linear Building Block . Dual Low Power Comparator and Voltage Reference with Programmable Hysteresis

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TC1041 Datasheet, PDF (4/14 Pages) Microchip Technology – Linear Building Block . Dual Low Power Comparator and Voltage Reference with Programmable Hysteresis

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TC1041

3.0 DETAILED DESCRIPTION

The TC1041 is one of a series of very low power, linear

building block products targeted at low voltage

operation. The TC1041 contains two comparators and

a voltage reference and operates at a minimum supply

voltage of 1.8V with a typical current consumption of

10ÂµA. Both comparators have programmable

hysteresis.

3.1 Comparator

The TC1041 contains two comparators with program-

mable hysteresis. The inverting inputs of the

comparators are connected to the output of the voltage

reference, while the range of the non-inverting inputs

extend beyond both supply voltages by 200mV. The

comparator outputs will swing to within several

millivolts of the supplies depending on the load current

being driven.

The comparators exhibit a propagation delay and

supply current which are largely independent of supply

voltage. The low input bias current and offset voltage

make them suitable for high impedance precision

applications.

3.2 Voltage Reference

A 2.0 percent tolerance, internally biased, 1.20V band-

gap voltage reference is included in the TC1041. It has

a push-pull output capable of sourcing and sinking at

least 50ÂµA.

3.3 Programmable Hysteresis

Hysteresis is added to the comparators by connecting

a resistor, R1, between the VREF and HYST pins and

another resistor, R2, between the HYST pin and VSS.

For no hysteresis, VREF should be directly connected to

HYST. The hysteresis, VHB, is equal to twice the

voltage difference between the VREF and HYST pins

where:

VHB = 2VREF R1/(R1 + R2) (See Figure 3-1)

and is symmetrical around the normal (without

hysterersis) threshold of the comparator. The

maximum voltage allowed between the VREF and HYST

pins is 80mV, giving a maximum hysteresis of 160mV.

FIGURE 3-1:

TC1041 PROGRAMMABLE HYSTERESIS

IREF

6 VREF

HYST

R1 = VHB

(2) (IREF)

( ) R2 =

1.2V â VHB

IREF

VSS

TC1041

Note: Size R1 and R2 such that IREF â¤ 50ÂµA

DS21346B-page 4

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