SX812X SEMTECH [Semtech Corporation], SX812X Datasheet - Page 7

• Manufacturer Part Number: SX812X
• Description: 1V Motor/LED control timer ADVANCED COMMUNICATIONS & SENSING
• Manufacturer: SEMTECH [Semtech Corporation]

ACS - Revision 2.2
© Semtech Corp.
TECHNICAL DESCRIPTION
4
4.1
ADVANCED COMMUNICATIONS & SENSING
System architecture
SX8120/21 architecture
The system is based on an integrated 5% precise counter. It starts and stops pulses based on the command of
a button and times-out after a selectable period of time.
The MOTOR output polarity is controlled by the POLARITY input. If POLARITY is connected the VDD that the
MOTOR will be active high, if POLARITY is connected the VSS, the MOTOR will be active low. MOTOR output is
usually followed by an NPN transistor to drive the motor, in this case it is active high.
In parallel with the motor there is a LED output that sends 3 us pulses at 43 kHz that can be used to drive a
white or green LED with an NPN transistor and a 40-200 uH coil.
POLARITY
BUTTON
NIMH
TO
August 2010
(counter )
1.4V
Start/Stop
debounce
Figure 2. SX8120/21 Architecture
Pulse
VDD
+
Page 7
SX8120/21
polarity
43kHz
Motor
Burst
MOTOR
1V Motor/LED control timer
VDD
VSS
LED
www.semtech.com/products/
SX8120/21
DATASHEET