BU9831 PDF даташит
Спецификация BU9831 изготовлена «ROHM Semiconductor» и имеет функцию, называемую «Non-volatile electronic potentiometer». |
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Детали детали
Номер произв | BU9831 |
Описание | Non-volatile electronic potentiometer |
Производители | ROHM Semiconductor |
логотип |
13 Pages
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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
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Memory ICs
•Block diagram
CS
SK
Command decode
Control
7bit
Timing Counter
DIO
16bit
EEPROM
Array
Wiper
decoder
Write
Disable
High
voltage
generator
BU9831 / BU9831F
VH
Transistor
switch
Register
array
•Pin assignments
Power supply
voltage detector
VCC VH VW VL
87 6 5
VL
VW
BU9831
•Pin desoriptions
Pin No.
Pin name
1 CS
2 SK
3 DIO
4 GND
5 VL
6 VW
7 VH
8 VCC
12 3 4
CS SK DIO GND
I / O Function
I Chip select input
I Serial data clock input
I / O Input / output of operating codes, addresses, and serial data
— Reference voltage of 0V for all input / output
Resistance pin Resistance low-potential
Resistance pin Wiper
Resistance pin Resistance high-potential
— Connection for power supply
2
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Memory ICs
•Input circuits
RESET int.
CS
CS int.
SK
BU9831 / BU9831F
•Output circuits
DIO
OE int.
CS int.
•Electrical characteristics (unless otherwise noted, Ta = – 20 to + 85°C, VCC = 5V ± 10%)
Parameter
Symbol Min. Typ. Max. Unit
Conditions
Measurement
Circuit
Input low level voltage
VIL —
—
0.2 ×
VCC
V
CS, SK, DIO pin
Input high level voltage
VIH
0.8 ×
VCC
—
—
V CS, SK, DIO pin
Output low level voltage
VOL
0
— 0.4 V IOL = 2.1mA
—
—
Fig.1
Output high level voltage
VOH
VCC –
0.4
—
VCC
V IOH = – 0.4mA
Fig.6
Input leakage current
ILI – 1 — 1 µA VIN = 0 ~ VCC
Fig.3
Output leakage current
ILO – 1
—
1
µA VOUT = 0 ~ VCC, CS = VCC
Fig.4
Operating current consumption
Standby current
ICC
ISB
—
—
— 3 mA f = 1MHz, tE / W = 10ms (WRITE) Fig.5
—
200
µA CS, SK, DIO, VH, VL, VW = VCC
Fig.6
SK frequency
Total resistance
Wiper resistance
fSK —
—
1 MHz
RT — 100 — kΩ If = 10µA
RW — 0.5 1 kΩ IW = – 1mA
—
Fig.7
Fig.8
Resistance potential on High side VVH
0
— VCC V
—
Resistance potential on Low side VVL
0
— VCC V
—
3
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Номер в каталоге | Описание | Производители |
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