SX812X Datasheet, PDF (1/17 Pages) Semtech Corporation – 1V Motor/LED control timer ADVANCED COMMUNICATIONS & SENSING

ADVANCED COMMUNICATIONS & SENSING
SX8120/21
1V Motor/LED control timer
DATASHEET
Description
The SX8120/21 is a series of 1 V motor/LED control
timers.
The SX8120/21 goes active on the press of a button.
The output goes back to sleep on the next button
press or after a preset time-out (15 sec or 30 sec on
SX8120, 10 minutes or never on the SX8121). The
time-out duration and the motor control polarity are
pin-selected.
When the SX8120/21 is active, it sets its MOTOR
control pin to high or low and sends a burst on its
LED pin to control a LED or boost a command
voltage.
One output goes low when VDD is higher than the
full charge voltage of an NiMH cell to control a
minimal charger.
The SX8120/21 controls its IO state starting at 0.6V to
facilitate power-up.
Features
1 V operation
1 button operation
Pin selection of time-out
Pin selection of motor polarity
Boosted LED control (drives bright white and green
LEDS)
NiMH cell charger control (allows USB recharge)
Applications
Electric toothbrushes
Electric razors
Toys - LED animation
LED pointer
USB rechargeable
Ordering Informations
Part number
Function
SX8120ISTRT
1V motor controller
SX8121ISTRT
1V motor controller
- Available in tape and reel only
- WEEE/RoHS compliant- Pb-Free and Halogen Free.
Time out
15 or 30 second
10 minute or none
Functional Block Diagram
SX8120 / SX8121
15 sec / 10 min
30 sec / None
Start and Stop
High
Low
TO
Pulse
(counter )
BUTTON
Start/Stop
+
debounce
POLARITY
VDD
NIMH
1.4V
3 - 5V
charger
SX8120/21
VDD
Motor
polarity
MOTOR
VSS
Burst
43kHz
LED
ACS - Revision 2.2
© Semtech Corp.
August 2010
Page 1
Motor
1 – 2 V Alkaline
NiMH or NiCd cell
www.semtech.com/products/