Semtech Corp.'sSX8120 and SX8121 devices operate
intrinsically at 0.9V to control a dc motor or other continuous low-voltage
element and drive a high-brightness LED directly from a single battery. The devices do not require an external boost
converter 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 to
operate from one AA or AAA alkaline, NiMH or NiCd battery. The devices have a
continuous output that can be activated on the press of a button to control
either a dc motor or other continuous low voltage function, as well as a burst
output to drive a high-brightness white or green LED, or other feature
requiring a voltage boost.
SX8120 and SX8121 are battery safe. They start
controlling 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 or
NiCd chargers management. At power down (low battery), the I/Os are controlled
again down to 0.6V and the current consumption is guaranteed less than 10 ÂµA
over the full industrial temperature range to avoid battery leakage. The
circuits will not start a load when the battery is low and it will stop a load
if it drops the battery too low.
The SX8120 provides an on/off switch
to 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 10
min timeout for applications such as electric razors, trimmers or epilators, or
a no timeout for direct motor and LED control in devices like portable LED
torchlights. Timeout and motor control polarity are pin-programmable.
Features of SX8120 and SX8121 Timeout Controllers:
Single-cell operation: AA or AAA alkaline, NiMH or NiCd battery
Battery safe operation with 0.6V I/O control
0.9 to 2V operation over the full industrial temperature range (-40 to +85C)
1-button operation with 15 or 30 sec timeout (SX8120) and 10 min or no timeout (SX8121)
dc motor control and boost control for high-brightness white or green LEDs
No external boost converter and inductor required
No software development needed
Packaging:SOIC 8-pin, lead-free, halogen-free, fully RoHS and WEEE compliant
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