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 ¬ĶA
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