ISL22449

Features:

• Four potentiometers in one package
• 128 resistor taps
• SPI serial interface
• Non-volatile storage of wiper position
• Wiper resistance: 70 typical
• Shutdown mode
• Shutdown current 6.5A max
• Power supply: 2.7V to 5.5V
• 50k or 10k total resistance
• High reliability
- Endurance: 1,000,000 data changes per bit per register
- Register data retention: 50 years @ T < +55°C
• 14 Lead TSSOP
• Pb-free plus anneal product (RoHS compliant)




Pinout






Specifications

Storage Temperature . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Voltage at any Digital Interface Pin
with Respect to GND . . . . . . . . . . . . . . . . . . . . . -0.3V to V_CC+0.3
V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
Voltage at any DCP pin with Respect to GND . . . . .. . -0.3V to Vcc
Lead Temperature (Soldering, 10s) . . . . . . . . . . . . . . . . .+300°C
IW (10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . ±6mA
Latchup (Note 4) . . . . . . . . . . . . . . . . Class II, Level B @ +125°C
ESD (HBM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5kV
(CDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........ . .1kV
Thermal Resistance (Typical, Note 3) JA (°C/W)
14 Ld TSSOP. . . . . . . . . . . . . . . . . . . . . . . . . . . . .................. . +100
Maximum Junction Temperature (Plastic Package) . . .. . . . .+150°C
Ambient Temperature . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
V_CC Voltage for DCP Operation . . . . . . . . . . . . ... . . . . . 2.7V to 5.5V
Wiper Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . -3mA to 3mA
Power Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5mW

CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the evice. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

Description

The ISL22449 integrates four digitally controlled potentiometers (DCP) and non-volatile memory on a monolithic CMOS integrated circuit. The digitally controlled potentiometers are implemented with a combination of resistor elements and CMOS switches. The position of the wipers are controlled by the user through the SPI serial interface. Each potentiometer has an associated volatile Wiper Register (WR) and a non-volatile Initial Value Register (IVR) that can be directly written to and read by the user. The contents of the WR controls the position of the wiper. At power-up the ISL22449  recalls the contents of the DCPs IVR to the corresponding WR. The DCP can be used as a voltage divider in a wide variety of applications including control, parameter adjustments, AC measurement and signal processing.