NCS37000

http://onsemi.com

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

NC

Tie to Ground or leave floating

8

NC

Float

9

NC

Tie to Ground or leave floating

10

NC

Tie to Ground or leave floating

11

NC

Tie to Ground or leave floating

12

NC

Tie to Ground or leave floating

13

NC

Float

14

NC

Float

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

NC

Tie to Ground or leave floating

7

NC

Float

8

NC

Tie to Ground or leave floating

9

NC

Tie to Ground or leave floating

10

NC

Tie to Ground or leave floating

11

Ground

Ground connection for IC

12

NC

Float

13

NC

Float

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