1
Memory ICs
Non-volatile electronic potentiometer
BU9831 / BU9831F
The BU9831 / BU9831F is a non-volatile electronic potentiometer with an internal 2k bit EEPROM. The resistance
value can be set by means of serial communications, and because the product contains an internal memory, condi-
tions can be retained.
In addition, the 2k bit memory capacity enables digital data to be stored in the memory.
•
Absolute maximum ratings (Ta = 25°C)
Applied voltage
Power
dissipation
BU9831
BU9831F
Pd
Storage temperature
Operating temperature
Input voltage
*
1 Reduced by 5.0mW for each increase in Ta of 1°C over 25°C.
*
2 Reduced by 3.5mW for each increase in Ta of 1°C over 25°C.
VCC
Parameter Symbol
Tstg
Topr
—
– 0.3 ~ + 7.0
Limits
– 65 ~ + 125
– 20 ~ + 85
– 0.3 ~ VCC + 0.3
mW
V
Unit
°C
°C
V
Wiper current IW – 1.0 mA
500
* 1
350
* 2
•
Applications
Portable LCD backlight adjustment devices for notebook computers, and other sound adjustment devices for sets
•
Features
1) Internal 2k bit EEPROM
2) 100kW (1kW· 100 steps) electronic potentiometer
3) Data in memory is automatically read when power supply is turned on, and resistance value is set.
4) Resistance value can be set using serial communications.
5) Low current consumption
When operating: 3mA (max.)
In standby mode: 200m A (max.)
•
Recommended operating conditions
Power supply voltage
Power supply voltage for writing Vccwr
VCC
Parameter Symbol
V
V
Unit
2.7 ~ 5.5
Limits
2.8 ~ 5.5
Input voltage VIN V 0 ~ VCC
Voltage at resistor ends VRHL V 0 ~ VCC
Wiper pin voltage VW V 0 ~ VCC