SX812X SEMTECH [Semtech Corporation], SX812X Datasheet - Page 10

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

ACS - Revision 2.2
© Semtech Corp.
5
1. Typical values.
5.1
5.2
5.3
5.4
ADVANCED COMMUNICATIONS & SENSING
1.05V
0.95V
0.9V
0.6V
Operating Modes
Safe Mode
The internal system goes in Safe mode as soon as the battery voltage is above 0.6-0.7V. In this mode all pins
are set in high impedance and are inactive. This guarantees a safe start-up when a battery is inserted. The
power consumption is 10uA max and prevents the battery from leaking when it is empty.
Low Batt mode
The device is in Low Batt mode as soon as the battery voltage reaches the 0.9V POR threshold. In this mode,
each output pin is in a static state. The device will not react to the BUTTON pin. The LED pin is set to ground.
The MOTOR pin is off according to POLARITY pin, meaning at VSS if POLARITY was set to ‘1’ or at VDD if
POLARITY was set to ‘0’ . The chip internally checks the VDD voltage each seconds and wakes up to Sleep
mode when VDD > V
to Safe mode), or above 1.41V (battery full).
Sleep mode
The MOTOR pin is off according to POLARITY pin, meaning at VSS if POLARITY was set to ‘1’ or at VDD if
POLARITY was set to ‘0’ . LED pin is tied to ground. The chip reacts to the BUTTON pin and if a low pulse occurs,
the device switch to Active mode. NIMH pin is set according to VDD voltage (see
Active Mode
The MOTOR pin is on according to the POLARITY pin, meaning at VDD if POLARITY was set to ‘0’ or at VSS if
POLARITY was set to ‘1’ . The LED pin send 43kHz burst. The internal system is in Active mode until the timeout
occurs or the button is pulsed again and then goes back to the Sleep mode. NIMH pin is set according to VDD
voltage (see
Switch ON
Switch OFF
POR
VDD
4.5. NiMH
SAFE
August 2010
ON (
pin).
1.05V typical). NIMH pin is forced high until the VDD voltage goes below 0.9V (back
BATT
LOW
Figure 4. Operating modes vs battery voltage
Page 10
ACTIVE or SLEEP
Hysteresis
1
BATT
LOW
1V Motor/LED control timer
www.semtech.com/products/
SAFE
4.5. NiMH
SX8120/21
DATASHEET
pin).
time