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PDF BU9831 Data sheet ( Hoja de datos )
| Número de pieza | BU9831 | |
| Descripción | Non-volatile electronic potentiometer | |
| Fabricantes | ROHM Semiconductor | |
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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
Power
BU9831
dissipation BU9831F
VCC
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
1 page  
Memory ICs
1MHz Clock
Input
VIL
SK
DIO
CS
VCC
A ICC
VCC
GND
VCC
SK
DIO
CS
BU9831 / BU9831F
VCC
A ISB
VCC
VCC
VH, VL, VW
GND
Fig. 5 Current consumption measurement circuit
VCC
CS
SK
DIO
GND
VH
VW
VL
V
Fig. 6 Standby current measurement circuit
I force
RT = V
I force
I force = 10µA
Fig. 7 Total resistance measurement circuit
VCC
CS
SK
DIO
GND
VH
VW
V
VL
V force
Measured after wiper
position is set to 00h
RWL = V / IW
V force = 1 / 2 · VCC
IW
Fig. 8 Wiper resistance measurement circuit on Low side
VCC
CS
SK
DIO
GND
VH
VW
VL
V
IW
V force
Measured after wiper
position is set to 64h
RWL = V / IW
V force = 1 / 2 · VCC
Fig. 9 Wiper resistance measurement circuit on High side
5
5 Page 
Memory ICs
(7) Transmission memory data write (TWDW)
H
SK
L
1
4
H
CS
L
8
BU9831 / BU9831F
16
H
DIO
L
1 0 1 0 0 1 0 1 A0
A6
tE/W
Fig. 17 Transmission memory data write
1) This command transmits the wiper position data to the addresses specified by A0 to A6. The data from the seven
bits D8 to D14 of the specified address are stored in the memory during the time tE / W, starting from the rise of the
16th clock.
2) Writing is done to the internal non-volatile memory during the time when this command is input and automatic
writing of the data is completed. Commands input during this time will not be accepted. The maximum time for this
period must be within tE / W.
3) After the write command has been input, if CS is set to LOW after having been set to HIGH, command reception
is enabled following termination of the automatic data writing. Data can then be received from SK and DIO. If CS is
left at LOW following input of the command, however, without being set to HIGH, input of the command is canceled.
(8) INC / DEC
H
SK
L
H
CS
L
H
DIO
L
VW
14
89
1 0 10 1 1 11
DEC
10 11
INC
t AW
t AW
t AW
Fig. 18 Increment / decrement wiper
1) The wiper position is incremented or decremented starting from the next clock following input of the INC / DEC
command, based on the status of the INC pin.
DIO = H: Incremented. The wiper position moves from the VL to the VH side by 1 tap per clock.
DIO = L: Decremented. The wiper position moves from the VH to the VL side by 1 tap per clock.
2) The tap is moved at each rise of the clock, until CS is set to HIGH.
When the tap is farthest to the VH side, incrementing is ignored.
In the same way, when the tap is farthest to the VL side, decrementing is ignored.
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet BU9831.PDF ] | |
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