SX8122ISTRT Semtech, SX8122ISTRT Datasheet - Page 12

• 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.
7
7.1
ADVANCED COMMUNICATIONS & SENSING
Power management
The internal system goes in a safe mode (IOs set as high impedance inputs) as long as the supply is below 0.6-
0.7 V. It starts reacting to TRIGGER when the supply reaches 1.1 V and continues to operate until the supply
goes back below 0.9V. When the supply goes below 0.9V, it goes back to safe mode. See
Modes.
Pin NIMH goes high when VDD is below the NIMH threshold of ~1.41V and low when VDD is above the same
threshold. Pin NIMH low means that if the power is coming from one NiMH cell, this one is full.
Low bat indicator for alkaline cell
The SX8122 can be used to indicate low bat of an alkaline cell, even when the cell voltage is below the LED
threshold voltage. It can either indicate it with a LED continuously on (simpler schematics, but is drains more
current), or with a blinking LED.
Figure 8. LED is continuously on when the supply voltage is below NiMH threshold
Figure 9. LED is blinking on when the supply voltage is below NiMH threshold
August 2010
DISCHARGE
DISCHARGE
TRIGGER
CHARGE
TRIGGER
CHARGE
NIMH
NIMH
Page 12
SX8122
SX8122
MOTOR
MOTOR
VDD
VSS
LED
VDD
VSS
LED
1.1 – 1.7 V
1.1 – 1.7 V
www.semtech.com/products/
LED
LED
1V Motor/LED timer
Alkaline
SX8122
Alkaline
DATASHEET
5. Operating