SX8122ISTRT Semtech, SX8122ISTRT Datasheet - Page 9

• Manufacturer Part Number: SX8122ISTRT
• Description: IC PWR MGMT SINGLE CELL 8-SOIC
• Manufacturer: Semtech

Specifications of SX8122ISTRT

• Applications: General Purpose
• Current - Supply: 80µA
• Voltage - Supply: 0.9 V ~ 2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SX8122ISTR

ACS - Revision 2.2
© Semtech Corp.
5
1. Typical values.
5.1
5.2
5.3
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 TRIGGER pin. The LED and MOTOR pins are
set to ground.
The chip internally checks the VDD voltage each seconds and wakes up to Sleep mode when VDD > V
1.05V typical). NIMH pin is forced high until the VDD voltage goes below 0.9V (back to Safe mode), or above
1.41V (battery full).
The pin configuration in Low Batt mode corresponds to the Force Discharge mode.
Active modes
The chip reacts to the TRIGGER pin voltage. See
NIMH pin is set according to VDD voltage. See
Force charge
Continue charge
Force discharge
Continue discharge
Switch ON
Switch OFF
POR
VDD
SAFE
August 2010
BATT
LOW
Figure 3. Operating modes vs battery voltage
Page 9
ACTIVE or SLEEP
4.4. NiMH
Hysteresis
4.3. Active
pin.
modes.
1
BATT
LOW
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SAFE
1V Motor/LED timer
SX8122
DATASHEET
time
ON (