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Si85xx Si85

XXUNIDIRECTIONAL

AC

CURRENTSENSORS

Features

Pin Assignments:See page20 Single-chip ac current sensor/conditioner FAULT output helps safeguard operation Low loss: Less than 1.3 m 1,000VDC isolation primary series resistance; less than 2nH primary inductance at 25ºC Accurate to ±5% of measurement 12-Pin QFN Large 2V
PP output pins signal at full scale Leading-edge noise suppression eliminates need for leading-edge blanking High-side or low-side current sensing
R1R2GND2GND3OUTNC 1 IINIOUT "Ping-Pong" output version allows one Si85xx to replace two current transformers in full-bridge applications –40 to 125 ºC operating range (Si85x4/5/6)

Si850x

Small 4x4x1mm package Low cost 5, 10, and 20A full-scale versions

Applications

TRSTGND1VDD2VDD1 Power supplies Lighting equipment Motor controls Industrial equipment

Description

R1R2R3R4OUT1OUT2 1 IINIOUT The Si85xx products are unidirectional ac current sensors available in full-scale ranges of 5, 10, and 20A. Si85xx products are ideal upgrades forolder current-sensing technologies offering size, performance and costadvantages over current transformers, Hall effect devices, DCR circuitsand other approaches. The Si85xx are extremely low loss, adding lessthan 1.3m

Si851x

of series resistance and less than 2nH series inductance inthe sensing path at 25ºC. Current-sensing terminals are isolated from theother package pins to a maximum voltage of 1,000VDC.
TRST/FAULTGNDMODEVDD

Functional Block Diagram

Patents pending
R1 R2 R3 R4 Si851x VDD RESET LOGIC MODE LOGIC MODE TRST IINIOUT R2 GND1 Si850x OUT1 INTEGRATOR SIGNAL CONDITIONING GND2 VIN OUT2 PH1PH2 R1OUTVDD1 Q1Q2 METAL SLUG L VOUT C TEMP SENSOR ADC AUTO CALIBRATION LOGIC Typical Application GND VDDTRST/FAULTIOUT IIN Preliminary Rev. 0.1 7/07Copyright © 2007 by Silicon LaboratoriesSi85xx This information applies to a product under development. Its characteristics and specifications are subject to change without notice.Silicon Laboratories Confidential. Information contained herein is covered under non-disclosure agreement (NDA).