BU9831 Datasheet, PDF (1/13 Pages) Rohm – Non-volatile electronic potentiometer

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.
•^Applications
Portable LCD backlight adjustment devices for notebook computers, and other sound adjustment devices for sets
•^Features
1) Internal 2k bit EEPROM
2) 100kΩ (1kΩ × 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: 200µA (max.)
•^{Absolute maximum ratings (Ta = 25°C)}
Parameter
Symbol
Limits
Applied voltage
VCC
Power
BU9831
dissipation _BU9831F
Pd
– 0.3 ~ + 7.0
500^∗1
350^∗2
Storage temperature
Tstg
– 65 ~ + 125
Operating temperature
Topr
– 20 ~ + 85
Input voltage
—
– 0.3 ~ VCC + 0.3
Wiper current
IW
± 1.0
∗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.
•^{Recommended operating conditions}
Parameter
Symbol
Power supply voltage
VCC
Power supply voltage for writing
Vccwr
Input voltage
VIN
Voltage at resistor ends
VRHL
Wiper pin voltage
VW
Limits
2.7 ~ 5.5
2.8 ~ 5.5
0 ~ VCC
0 ~ VCC
0 ~ VCC
Unit
V
mW
°C
°C
V
mA
Unit
V
V
V
V
V
1