Semtech Single-Cell LED and Motor Timer-Controllers

Semtech Corp.'s SX8120 and SX8121 devices operateintrinsically at 0.9V to control a dc motor or other continuous low-voltageelement and drive a high-brightness LED directly from a single battery. The devices do not require an external boostconverter and inductor, saving board space and cost.

SX8120 and SX8121 timer-controllers operate between 0.9 and 2V over the full industrial temperature range of -40 to +85C, making them ideally suited tooperate from one AA or AAA alkaline, NiMH or NiCd battery. The devices have acontinuous output that can be activated on the press of a button to controleither a dc motor or other continuous low voltage function, as well as a burstoutput to drive a high-brightness white or green LED, or other featurerequiring a voltage boost.

SX8120 and SX8121 are battery safe. They startcontrolling I/Os at 0.6V to prevent unexpected behavior in external components and current drain during start-up phase. They also feature a battery overload indicator for slow NiMH orNiCd chargers management. At power down (low battery), the I/Os are controlledagain down to 0.6V and the current consumption is guaranteed less than 10 AmuAover the full industrial temperature range to avoid battery leakage. Thecircuits will not start a load when the battery is low and it will stop a loadif it drops the battery too low.

The SX8120 provides an on/off switchto start/stop a motor with a 15 or 30 sec timeout which is useful for toys, electric toothbrushes and LED pointers.

SX8121 offers the option of a 10min timeout for applications such as electric razors, trimmers or epilators, ora no timeout for direct motor and LED control in devices like portable LEDtorchlights. Timeout and motor control polarity are pin-programmable.

Features of SX8120 and SX8121 Timeout Controllers:

Semtech Single-Cell LED and Motor Timer-Controllers