Programmable digital delays
16 May 2012
Analogue, Mixed Signal, LSI
LSI/CSI announced the addition of four new devices to its family of programmable digital delay timer ICs. Designated LS7211N, LS7212N, LS7215 and LS7216, they provide delay times programmable from microseconds to days using eight binary-weighted delay bits.
An external clock or oscillator can be used as the time base for these ICs. The on-chip oscillator for the LS7211N and LS7215 is controlled by an external RC while the on-chip oscillator for the LS7212N and LS7216 is controlled by an external crystal.
The ICs can be operated in either of four operating modes: one-shot, delayed operate, delayed release and dual delay. Selectable prescalers are available to generate delays in units of minutes from 50 Hz/60 Hz frequency sources (LS7211N, LS7215) and delays in units of seconds or minutes from a watch crystal (LS7212N, LS7216).
The ability of the LS7215 and LS7216 to latch binary-weighted delay bits from a shared 8-bit bus opens up applications for use in a wide range of microcontroller-based systems. Typical applications include time delay relays for medical equipment, HVAC, automotive, security systems and lighting controls.
Providing added flexibility, the LS7215 and LS7216 have an open-drain output in addition to the standard push-pull output available on the LS7211N and LS7212N. This added output allows the IC to directly drive a relay coil returned to the same voltage as the chip VDD or, using one external transistor, the IC can control a relay coil returned to a voltage as high as 110 V with a chip VDD as low as 3 V. The push-pull output can be used to light an LED to indicate that the relay coil is energised.
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