New Feature
Dual Interface
Low Power + Quad 256-tap +
2-Wire bus + Up/Down interface
Quad Digitally-Controlled (XDCP
TM
) Potentiometer
FEATURES
• Quad solid state potentiometer
• 256 wiper tap points–0.4% resolution
• 2-wire serial interface for Write, Read, and
transfer operations of the potentiometer
• Up/down interface for individual potentiometers
• Wiper resistance: 40
Ω
typical
• Non-volatile storage of wiper positions
• Power On Recall. Loads saved wiper position on
Power-Up.
• Standby current < 20µA Max
• Maximum wiper current: 3mA
• V
CC
: 2.7V to 5.5V operation
• 2.8k
Ω
,
10k
Ω
, 50k
Ω
,
100k
Ω
version of total pot
resistance
• Endurance: 100, 000 data changes per bit per
register
• 100 yr. data retention
• 24-Lead TSSOP
DESCRIPTION
X9252
The X9252 integrates 4 digitally controlled potentio-
meters (XDCP) on a monolithic CMOS integrated
circuit.
The digitally controlled potentiometers are imple-
mented using 255 resistive elements in a series array.
Between each pair of elements are tap points con-
nected to wiper terminals through switches. The posi-
tion of each wiper on the array is controlled by the user
through the Up/Down (U/D) or 2-wire bus interface.
The wiper of each potentiometer has an associated
volatile Wiper Counter Register (WCR) and four non-
volatile Data Registers (DRs) that can be directly writ-
ten to and read by the user. The contents of the WCR
controls the position of the wiper on the resistor array
though the switches. At power-up, the device recalls
the contents of the default data registers DR00, DR10,
DR20, DR30, to the corresponding WCR.
Each DCP can be used as a three-terminal potentio-
meter or as a two terminal variable resistor in a wide
variety of applications including the programming of
bias voltages, the implementation of ladder networks,
and three resistor programmable networks.
FUNCTIONAL DIAGRAM
V
CC
A2
A1
A0
SDA
SCL
Up-Down
Interface
POWER UP,
INTERFACE
CONTROL
AND
STATUS
2-Wire
Interface
WCR0
DR00
DR01
DR02
DR03
DCP0
WCR1
DR10
DR11
DR12
DR13
DCP1
WCR2
DR20
DR21
DR22
DR23
DCP2
WCR3
DR30
DR31
DR32
DR33
DCP3
R
H0
R
H1
R
H2
R
H3
DS0
DS1
CS
U/D
V
SS
WP
R
W0
R
L0
R
W1
R
L1
R
W2
R
L2
R
W3
R
L3
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X9252
PIN CONFIGURATION
TSSOP
DS0
A0
R
W3
R
H3
R
L3
U/D
V
CC
R
L0
R
H0
R
W0
A2
WP
1
2
3
4
5
6
7
8
9
10
11
12
X9252
24
23
22
21
20
19
18
17
16
15
14
13
DS1
SCL
R
L2
R
H2
R
W2
CS
V
SS
R
W1
R
H1
R
L1
A1
SDA
ORDERING INFO
Ordering Number
X9252YV24-2.7
X9252YV24I-2.7
X9252WV24-2.7
X9252WV24I-2.7
X9252UV24-2.7
X9252UV24I-2.7
X9252TV24-2.7
X9252TV24I-2.7
RTOTAL
2.8k
Ω
2.8k
Ω
10k
Ω
10k
Ω
50k
Ω
50k
Ω
100k
Ω
100k
Ω
Package
24-lead TSSOP
24-lead TSSOP
24-lead TSSOP
24-lead TSSOP
24-lead TSSOP
24-lead TSSOP
24-lead TSSOP
24-lead TSSOP
Operating Temperature Range
0°C to 70°C
-40°C to +85°C
0°C to 70°C
-40°C to +85°C
0°C to 70°C
-40°C to +85°C
0°C to 70°C
-40°C to +85°C
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X9252
PIN ASSIGNMENTS
TSSOP pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Symbol
DS0
A0
RW3
RH3
RL3
U/D
VCC
RL0
RH0
RW0
A2
WP
SDA
A1
RL1
RH1
RW1
VSS
CS
RW2
RH2
RL2
SCL
DS1
Device Address for 2-wire bus.
Wiper terminal of DCP3.
High terminal of DCP3.
Low terminal of DCP3.
Brief Description
DCP select for Up/Down interface.
Increment/Decrement for Up/Down interface.
System Supply Voltage
Low terminal of DCP0.
High terminal of DCP0.
Wiper terminal of DCP0.
Device Address for 2-wire bus.
Hardware Write Protect
Serial Data Input/Output for 2-wire bus.
Device Address for 2-wire bus.
Low terminal of DCP1.
High terminal of DCP1.
Wiper terminal DCP1.
System ground
Chip select for Up/Down interface.
Wiper terminal of DCP2.
High terminal of DCP2.
Low terminal of DCP2.
Serial Clock for 2-wire bus.
DCP select for Up/Down interface.
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X9252
ABSOLUTE MAXIMUM RATINGS
Junction Temperature under bias ......–65
°
C to +135
°
C
Storage temperature .........................–65
°
C to +150
°
C
Voltage at any digital interface pin
with respect to V
SS
.................................. –1V to +7V
V
CC
............................................................ –1V to +7V
Voltage at any DCP pin with
respect to V
SS
..........................................-1V to V
CC
Lead temperature (soldering, 10 seconds).........300
°
C
I
W
(10 seconds) ................................................. ±6mA
RECOMMENDED OPERATING CONDITIONS
Temp
Commercial
Industrial
COMMENT
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only; the functional operation of
the device (at these or any other conditions above
those listed in the operational sections of this specifica-
tion) is not implied. Exposure to absolute maximum rat-
ing conditions for extended periods may affect device
reliability.
Min.
0
°
C
–40
°
C
Max.
+70
°
C
+85
°
C
Device
X9252
Supply Voltage (V
CC
)
(4)
Limits
2.7V to 5.5V
ANALOG CHARACTERISTICS
(Over recommended operating conditions unless otherwise stated.)
Limits
Symbol
R
TOTAL
Parameter
End to end resistance
End to end resistance tolerance
Power rating
Min.
Typ.
(4)
2.8, 10,
50, 100
Max.
Unit
k
Ω
Test Conditions
Y, W, U, T versions respectively
-20
0.75
-3.0
50
+20
50
2.0
+3.0
150
%
mW
%
mA
Ω
Wiper current =
See test circuit
V
CC
R
TOTAL
25°C, each DCP
R
TOTAL
Matching
I
W
(5)
R
W
DCP to DCP resistance
matching
Wiper current
Wiper resistance
V
TERM
Voltage on any DCP pin
Noise
(5)
Resolution
Absolute linearity
(1)
Relative linearity
(2)
Temperature coefficient of
resistance
(5)
Ratiometric Temperature
(5)
Coefficient
Vss
-120
0.4
–1
–0.3
±
300
–20
10/10/25
0.1
Vcc
V
dBV
%
Ref: 1kHz
+1
+0.3
MI
(3)
MI
(3)
ppm/
°
C V(R
H0
)=V(R
H1
)=V(R
H2
)=V(R
H3
)=V
CC
V(R
L0
)=V(R
L1
)=V(R
L2
)=V(R
L3
)=V
SS
+20 ppm/°C
pF
10
µA
See equivalent circuit
Voltage at pin from V
SS
to V
CC
C
H
/C
L
/C
W
I
OL
Potentiometer Capacitance
(5)
Leakage on DCP pins
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X9252
D.C. OPERATING CHARACTERISTICS
(Over the recommended operating conditions unless otherwise specified.)
Symbol
I
CC1
I
CC2
I
CC3
I
SB
I
L
V
IH
V
IL
V
OL
Parameter
V
CC
supply current
(Volatile write/read)
V
CC
supply current
(active)
V
CC
supply current
(nonvolatile write)
V
CC
current (standby)
Leakage current, bus
interface pins
Input HIGH voltage
Input LOW voltage
SDA pin output LOW
voltage
Min.
Limits
Max.
3
Units
mA
Test Conditions
f
SCL
= 400kHz;SDA = Open; (for 2-Wire,
Active, Read and Volatile Write States
only)
f
SCL
= 200kHz; (for U/D interface,
increment, decrement)
f
SCL
= 400kHz; SDA = Open;
(for 2-Wire, Active, Nonvolatile Write State
only)
V
CC
= +5.5V; V
IN
= V
SS
or V
CC
; SDA =
V
CC
; (for 2-Wire, Standby State only)
Voltage at pin from V
SS
to V
CC
3
5
mA
mA
20
-10
V
CC
x 0.7
–1
10
V
CC
+ 1
V
CC
x 0.3
0.4
µA
µA
V
V
V
I
OL
= 3mA
ENDURANCE AND DATA RETENTION
Parameter
Minimum endurance
Data retention
Min.
100,000
100
Units
Data changes per bit
Years
CAPACITANCE
Symbol
C
IN/OUT
(5)
C
IN
(5)
Test
Input / Output capacitance (SDA)
Input capacitance (
SCL, WP, DS0, DS1, CS, U/D,
A2, A1 and A0
)
Max.
8
6
Units
pF
pF
Test Conditions
V
OUT
= 0V
V
IN
= 0V
POWER-UP TIMING
Symbol
t
D
(5)(9)
Parameter
Power Up Delay from V
CC
power up (V
CC
above 2.7V) to wiper position recall com-
pleted, and communication interfaces ready
for operation.
Max.
2
Units
ms
A.C. TEST CONDITIONS
I
nput Pulse Levels
Input rise and fall times
Input and output timing threshold level
External load at pin SDA
V
CC
x 0.1 to V
CC
x 0.9
10ns
V
CC
x 0.5
2.3kΩ to V
CC
and 100 pF to V
SS
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