Single-coil latching relays found applications including signal routin

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Single-coil latching relays found applications including signal routin

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drives four single-coil latching relays
Single-coil latching relays found applications including signal routing, audio, automotive systems. These relays pose design challenge because coil current must flow both directions through single coil (Figure Current flowing from causes relay latch reset position, current flowing from latches relay position. relay maintains position even when coil current removed. Power saved removing coil current after relay latches. simple circuit that drives four single-coil latching relays (Figure includes parallelinterface relay driver (U1) with open-drain outputs (Figure inductive-kickback protection. Latch four relays their reset positions turning corresponding output (OUTX). That output selected asserting digital address pins while high. Activate output toggling (Figure Current flows into enabled open-drain output latches relay reset position, according direction coil current. Drive RESET turn enabled open-drain outputs, soon relays latch ensure lowest power consumption. Observe set/reset timing shown Figure pull RESET until required time (tSET/RESET) elapsed. Waiting tSET/RESET after last toggle ensures that selected relays will properly latch their intended positions. Clamping diodes each OUTX catch highvoltage transients that occur when coil current interrupted. Those diodes, shown Figure clamp OUTX voltage 0.7V. similar article appeared February, 2004 issue EET.
RESET
Figure Current flow single coil latches corresponding relay RESET position.
RELAY AROMAT AGN210A4HZ
0.1µF
OUT1 OUT2 OUT3 OUT4
RELAY AROMAT AGN210A4HZ
MAX4821 OUT6 OUT7 RESET OUT8 PGND
OUT5
RELAY AROMAT AGN210A4HZ
RELAY AROMAT AGN210A4HZ
Figure This circuit easily drives four, single-coil latching relays.
OUT1 VOUT
OUT2 RESET IOFF tSET/RESET
100ns tON, tOFF tSET/RESET GUARANTEED RESET TIME NEEDED RELAY LATCH (CONSULT RELAY DATA SHEET)
Figure This diagram shows eight open-drain outputs from circuit Figure
Figure Interface timing circuit Figure illustrates activated output.

Single-coil latching relays found applications including signal routin

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