QT102-ISG View Datasheet(PDF) - Quantum Research Group

Part Name

Description

Manufacturer

QT102-ISG

QTOUCH™ TOGGLE-MODE CHARGE-TRANSFER IC WITH POWER MANAGEMENT FUNCTIONS

Quantum Research Group 

Table 2.1 Pin Descriptions

PIN NAME TYPE

DESCRIPTION

1

OUT

O

To switched circuit and output polarity selection resistor (Rop)

2

VSS

P

Ground power pin

3

SNSK

IO To Cs capacitor and to sense electrode

4

SNS

IO

To Cs capacitor and multiplier configuration resistor (Rm)

Rm must be fitted and connected to either VSS or VDD. Refer to Section 3.5 for details.

5

VDD

P

Positive power pin

6

TIME

I

Timeout configuration pin, which must be connected to either VSS, VDD, OUT or an RC network. Refer to

Section 3.5 for details.

I Input only

O Output only, push-pull

OD Open drain output

IO Input and output

P Ground or power

Figure 2.1 Basic Circuit Configuration

(active high output, 15 minute auto switch-off)

SENSE

ELECTRODE

RS

VDD

5

Note: bypass capacitor to be tightly

wired between VDD and VSS and

kept close to QT102 pin 5.

VDD

3 SNSK

OUT 1

CS

4 SNS

Rop

Rm

TIME 6

VSS

2

Re Figure 2.1, check the following sections for component values:

• Section 2.2, page 5: Cs capacitor (Cs)

• Section 2.3, page 5: Sample resistor (Rs)

• Section 2.4, page 5: Voltage levels

• Section 3.5.2, page 8: Rm

• Section 3.3, page 7: Rop

lQ

6

QT102_2R3.04_0807

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