2004 Drives Four Single-Coil Latching Relays Relay-driver al
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SWITCHES MULTIPLEXERS
2004
Drives Four Single-Coil Latching Relays
Relay-driver allows 3-bit parallel interface independently open close each four latching relays. Single-coil latching relays, with applications signal routing, audio, automotive systems, pose design challenge because coil current must flow both directions through single coil. Current flowing direction latches relay "set" position. Current opposite direction latches "reset" position. relay maintains position even when coil current removed. Power saved removing coil current after relay latches. Figure current flowing from latches relay position, while current from resets
Figure Current flow single coil latches corresponding relay RESET position. 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 reset position turning corresponding output (OUTX). That output selected asserting digital address pins A2-A0 while /CS\ high. Activate output toggling /CS\ (Figure
Figure This circuit easily drives four single-coil latching relays.
Figure U1's open-drain outputs, from Figure
Figure Interface timing circuit Figure Current flows into enabled open drain output latches relay reset position, according direction coil current. Drive /RESET\ turn enabled open-drain outputs. Drive /RESET\ 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 /CS\ toggle ensures that selected relays will properly latch their intended positions. Clamping diodes each OUTX catch high-voltage transients that occur when coil current interrupted. Those diodes (shown Figure clamp OUTX voltage 0.7V.
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