NCS37012

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3

Table 1. PIN FUNCTION DESCRIPTION − QFN

Pin #

Name

Pad Description

0

Ground

QFN center slug

1

MLD

Mains Level Detect (Zero Cross)

2

CTresGN

Determines IV converter gain for detection threshold / matched to CT turns ratio (Ground-Neutral)

3

CTbias

Direct connection to the CT

4

CTstim

Direct connection to the CT

5

CTresD

Determines IV converter gain for detection threshold / matched to CT turns ratio (Differential Current)

6

IDF

Front end noise filter capacitor

7

GFtest

Output to induce external differential current

8

TripEN

(H) Trip / (L) No Trip on Self Test Failure

9

PZ

Piezo output driver

10

NC

Tie to Ground or leave floating

11

PTT

Push to test input

12

TI

Tip indicator input

13

LED[0]

LED[0] output driver

14

LED[1]

LED[1] output driver

15

SCRdrv

Used to trigger the solenoid at a fault detection

16

Supply

Power supply

Table 2. PIN FUNCTION DESCRIPTION − TSSOP

Pin #

Name

Pad Description

1

CTstim

Differential and ground to neutral stimulus point for the current transformer

2

Ground

Ground connection for IC

3

CTresD

Determines IV converter gain for detection threshold / matched to CT turns ratio (Differential Current)

4

IDF

Determines corner frequency of the differential current path filter

5

GFtest

Output to induce external differential current

6

TripEN

(H) Trip / (L) No Trip on Self Test Failure

7

PZ

Piezo output driver

8

NC

Tie to Ground or leave floating

9

PTT

Push to test input

10

TI

Tip indicator input

11

Ground

Ground connection for IC

12

LED[0]

LED[0] output driver

13

LED[1]

LED[1] output driver

14

SCRdrv

Used to trigger the solenoid at a fault detection

15

DVDD

Internal digital 5 V regulated supply

16

AVDD

Internal analog 5 V regulated supply

17

Supply

12 V shunt regulated power supply

18

MLD

Mains Level Detect (Zero Cross) and AM slope detect (for oscillator sync/trim and AM init)

19

CTresGN

Determines IV converter gain for detection threshold / matched to CT turns ratio (Ground-Neutral)

20

CTbias

External 2 V bias for the current transformer