NCS37000
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3
Table 1. PIN FUNCTION DESCRIPTION ï 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 ï 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
