DATASHEET

X9258
Low Noise/Low Power/2-Wire Bus/256 Taps
Data Sheet
December 15, 2011
Quad Digital Controlled Potentiometers
(XDCP™)
FN8168.6
Features
• Four potentiometers in one package
The X9258 integrates 4 digitally controlled potentiometers
(XDCP™) on a monolithic CMOS integrated circuit.
• 256 resistor taps/potentiometer................. 0.4% resolution
• 2-wire serial interface
The digitally controlled potentiometer is implemented using
255 resistive elements in a series array. Between each
element are tap points connected to the wiper terminal
through switches. The position of the wiper on the array is
controlled by the user through the 2-wire bus interface. Each
potentiometer has associated with it a volatile Wiper Counter
Register (WCR) and 4 non-volatile Data Registers
(DR0:DR3) that can be directly written to and read by the
user. The contents of the WCR controls the position of the
wiper on the resistor array though the switches. Power-up
recalls the contents of DR0 to the WCR.
• Wiper resistance, 40Ω typical @ V+ = 5V, V- = -5V
• Four nonvolatile data registers for each potentiometer
• Nonvolatile storage of wiper position
• Standby current <5µA max (total package)
• Power supplies
- VCC = 2.7V to 5.5V
- V+ = 2.7V to 5.5V
- V- = -2.7V to -5.5V
• 100kΩ, 50kΩ total potentiometer resistance
The XDCP™ can be used as a three-terminal potentiometer
or as a two-terminal variable resistor in a wide variety of
applications including control, parameter adjustments, and
signal processing.
• High reliability
- Endurance: 100,000 data changes per bit per register
- Register data retention . . . . . . . . . . . . . . . . . . 100 years
• 24 Ld SOIC, 24 Ld TSSOP
• Dual supply version of X9259
• Pb-free (RoHS compliant)
Block Diagram
POT 0
VCC
VSS
R0
R1
V+
VR2
WP
R3
VH0/RH0
WIPER
COUNTER
REGISTER
(WCR)
VL0/RL0
A0
A1
A2
A3
R2
R1
R3
WIPER
COUNTER
REGISTER
(WCR)
RESISTOR
ARRAY
INTERFACE
AND
CONTROL
CIRCUITRY
VH2/RH2
POT 2
VL2/RL2
VW0/RW0
SCL
SDA
R0
VW2/RW2
8
VW1/RW1
DATA
R0
R2
1
R1
R3
WIPER
COUNTER
REGISTER
(WCR)
RESISTOR
ARRAY
POT 1
VW3/RW3
VH1/RH1
R0
R1
VL1/RL1
R2
R3
WIPER
COUNTER
REGISTER
(WCR)
RESISTOR
ARRAY
POT 3
VH3/RH3
VL3/RL3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2005, 2006, 2011. All Rights Reserved
Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
X9258
Ordering Information
PART NUMBER
(Note 2)
PART
MARKING
X9258US24Z (Note 1)
X9258US Z
X9258US24IZ (Note 1)
VCC LIMITS
(V)
50
PACKAGE
(Pb-free)
PKG.
DWG. #
0 to +70
24 Ld SOIC (300 mil)
M24.3
X9258US ZI
-40 to +85
24 Ld SOIC (300 mil)
M24.3
X9258UV24IZ
X9258UV ZI
-40 to +85
24 Ld TSSOP (4.4mm)
MDP0044
X9258TS24Z
X9258TS Z
0 to +70
24 Ld SOIC (300 mil)
M24.3
X9258TS24IZ (Note 1)
X9258TS ZI
-40 to +85
24 Ld SOIC (300 mil)
M24.3
0 to +70
24 Ld SOIC (300 mil)
M24.3
X9258US24IZ-2.7 (Note 1) X9258US ZG
-40 to +85
24 Ld SOIC (300 mil)
M24.3
X9258UV24IZ-2.7
-40 to +85
24 Ld TSSOP (4.4mm)
MDP0044
0 to +70
24 Ld SOIC (300 mil)
M24.3
X9258TS24IZ-2.7 (Note 1) X9258TS ZG
-40 to +85
24 Ld SOIC (300 mil)
M24.3
X9258TV24IZ-2.7
X9258TV ZG
-40 to +85
24 Ld TSSOP (4.4mm)
MDP0044
X9258TV24Z-2.7
X9258TV ZF
0 to +70
24 Ld TSSOP (4.4mm)
MDP0044
X9258US24Z-2.7 (Note 1) X9258US ZF
5 ±10
POTENTIOMETER TEMPERATURE
RANGE
ORGANIZATION
(°C)
(kΩ)
100
2.7 to 5.5
50
X9258UV ZG
X9258TS24Z-2.7 (Note 1) X9258TS ZF
100
NOTES:
1. Add “T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for X9258. For more information on MSL please see tech brief TB363.
2
FN8168.6
December 15, 2011
X9258
Pinout
X9258
(24 LD SOIC, TSSOP)
TOP VIEW
NC
1
24
A3
A0
2
23
SCL
VW3/RW3
3
22
VL2/RL2
VH3/RH3
4
21
VH2/RH2
VL3/RL3
5
20
VW2/RW2
V+
6
19
V–
18
VSS
VCC
7
X9258
VL0/RL0
8
17
VW1/RW1
VH0/RH0
9
16
VH1/RH1
VW0/RW0
10
15
VL1/RL1
A2
11
14
A1
12
13
SDA
WP
Pin Descriptions
Pin Names
SYMBOL
Host Interface Pins
DESCRIPTION
SERIAL CLOCK (SCL)
SCL
Serial Clock
The SCL input is used to clock data into and out of the X9258.
SDA
Serial Data
A0 thru A3
SERIAL DATA (SDA)
SDA is a bidirectional pin used to transfer data into and out of
the device. It is an open drain output and may be wire-ORed
with any number of open drain or open collector outputs. An
open drain output requires the use of a pull-up resistor. For
selecting typical values, refer to “Guidelines for Calculating
Typical Values of Bus Pull-Up Resistors” on page 10.
DEVICE ADDRESS (A0 - A3)
The Address inputs are used to set the least significant 4 bits
of the 8-bit slave address. A match in the slave address
serial data stream must be made with the address input in
order to initiate communication with the X9258. A maximum
of 16 devices may occupy the 2-wire serial bus.
Device Address
VH0/RH0 thru VH3/RH3,
VL0/RL0 thru VL3/RL3
Potentiometer Pins
(terminal equivalent)
VW0/RW0 thru VW3/RW3
Potentiometers Pins
(wiper equivalent)
WP
V+, V-
Hardware Write Protection
Analog Supplies
VCC
System Supply Voltage
VSS
System Ground
NC
No Connection (Allowed)
Principles Of Operation
The VH/RH and VL/RL inputs are equivalent to the terminal
connections on either end of a mechanical potentiometer.
The X9258 is a highly integrated microcircuit incorporating
four resistor arrays and their associated registers and
counters and the serial interface logic providing direct
communication between the host and the DCP
potentiometers.
VW/RW (VW0/RW0 - VW3/RW3)
Serial Interface (2-Wire)
The wiper outputs are equivalent to the wiper output of a
mechanical potentiometer.
The X9258 supports a bidirectional bus oriented protocol.
The protocol defines any device that sends data onto the
bus as a transmitter and the receiving device as the receiver.
The device controlling the transfer is a master and the
device being controlled is the slave. The master will always
initiate data transfers and provide the clock for both transmit
and receive operations. Therefore, the X9258 will be
considered a slave device in all applications.
Potentiometer Pins
VH/RH (VH0/RH0 - VH3/RH3), VL/RL (VL0/RL0 - VL3/RL3)
Hardware Write Protect Input (WP)
The WP pin when low prevents nonvolatile writes to the Data
Registers.
Analog Supplies V+, VThe Analog Supplies V+, V- are the supply voltages for the
DCP analog section.
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December 15, 2011
X9258
Clock and Data Conventions
Device Addressing
Data states on the SDA line can change only during SCL
LOW periods (tLOW). SDA state changes during SCL HIGH
are reserved for indicating start and stop conditions.
Following a start condition the master must output the
address of the slave it is accessing. The most significant
4 bits of the slave address are the device type identifier
(refer to Figure 1). For the X9258 this is fixed as 0101[B].
Start Condition
All commands to the X9258 are preceded by the start
condition, which is a HIGH to LOW transition of SDA while
SCL is HIGH (tHIGH). The X9258 continuously monitors the
SDA and SCL lines for the start condition and will not
respond to any command until this condition is met.
DEVICE TYPE
IDENTIFIER
0
1
0
Stop Condition
All communications must be terminated by a stop condition,
which is a LOW to HIGH transition of SDA while SCL is
HIGH.
Acknowledge
Acknowledge is a software convention used to provide a
positive handshake between the master and slave devices
on the bus to indicate the successful receipt of data. The
transmitting device, either the master or the slave, will
release the SDA bus after transmitting 8 bits. The master
generates a ninth clock cycle and during this period the
receiver pulls the SDA line LOW to acknowledge that it
successfully received the 8 bits of data.
The X9258 will respond with an acknowledge after
recognition of a start condition and its slave address and
once again after successful receipt of the command byte. If
the command is followed by a data byte, the X9258 will
respond with a final acknowledge.
Array Description
The X9258 is comprised of four resistor arrays. Each array
contains 255 discrete resistive segments that are connected
in series. The physical ends of each array are equivalent to
the fixed terminals of a mechanical potentiometer (VH/RH
and VL/RL inputs).
1
A3
A2
A1
A0
DEVICE ADDRESS
FIGURE 1. SLAVE ADDRESS
The next 4 bits of the slave address are the device address.
The physical device address is defined by the state of the A0
thru A3 inputs. The X9258 compares the serial data stream
with the address input state; a successful compare of all
4 address bits is required for the X9258 to respond with an
acknowledge. The A0 thru A3 inputs can be actively driven
by CMOS input signals or tied to VCC or VSS.
Acknowledge Polling
The disabling of the inputs (during the internal nonvolatile
write operation), can be used to take advantage of the
typical 5ms nonvolatile write cycle time. Once the stop
condition is issued to indicate the end of the nonvolatile write
command, the X9258 initiates the internal write cycle. ACK
polling can be initiated immediately. This involves issuing the
start condition followed by the device slave address. If the
X9258 is still busy with the write operation, no ACK will be
returned. If the X9258 has completed the write operation an
ACK will be returned and the master can then proceed with
the next operation.
At both ends of each array and between each resistor
segment is a CMOS switch connected to the wiper (VW)
output. Within each individual array only one switch may be
turned on at a time. These switches are controlled by the
Wiper Counter Register (WCR). The 8 bits of the WCR are
decoded to select, and enable, one of 256 switches.
The WCR may be written directly, or it can be changed by
transferring the contents of one of four associated data
registers into the WCR. These data registers and the WCR
can be read and written by the host system.
4
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December 15, 2011
X9258
ACK Polling Sequence
.
REGISTER
SELECT
NONVOLATILE WRITE
COMMAND COMPLETED
ENTER ACK POLLING
I3
I2
I1
I0
R1
R0
P1
P0
WIPER COUNTER
INSTRUCTIONS
REGISTER SELECT
ISSUE
START
FIGURE 2. INSTRUCTION BYTE FORMAT
ISSUE SLAVE
ADDRESS
The four high order bits define the instruction. The next 2 bits
(R1 and R0) select one of the four registers that is to be
acted upon when a register oriented instruction is issued.
The last bits (P1, P0) select which one of the four
potentiometers is to be affected by the instruction.
ISSUE STOP
ACK
RETURNED?
NO
Four of the nine instructions end with the transmission of the
instruction byte. The basic sequence is illustrated in
Figure 3. These two-byte instructions exchange data
between the Wiper Counter Register and one of the data
registers. A transfer from a Data Register to a Wiper Counter
Register is essentially a write to a static RAM. The response
of the wiper to this action will be delayed tWRL. A transfer
from the Wiper Counter Register (current wiper position), to
a data register is a write to nonvolatile memory and takes a
minimum of tWR to complete. The transfer can occur
between one of the four potentiometers and one of its
associated registers; or it may occur globally, wherein the
transfer occurs between all of the potentiometers and one of
their associated registers.
YES
FURTHER
OPERATION?
NO
YES
ISSUE
INSTRUCTION
ISSUE STOP
PROCEED
PROCEED
Four instructions require a three-byte sequence to complete.
These instructions transfer data between the host and the
X9258; either between the host and one of the data registers
or directly between the host and the Wiper Counter Register.
These instructions are: Read Wiper Counter Register (read
the current wiper position of the selected potentiometer),
Write Wiper Counter Register (change current wiper position
of the selected potentiometer), Read Data Register (read the
contents of the selected nonvolatile register) and Write Data
Register (write a new value to the selected data register).
The sequence of operations is shown in Figure 4.
Instruction Structure
The next byte sent to the X9258 contains the instruction and
register pointer information. The four most significant bits are
the instruction. The next four bits point to one of the two
potentiometers and when applicable they point to one of four
associated registers. The format is shown in Figure 2.
SCL
SDA
S
T
A
R
T
0
1
0
1
A3
A2
A1
A0
A
C
K
I3
I2
I1
I0
R1
R0
P1
P0
A
C
K
S
T
O
P
FIGURE 3. TWO-BYTE INSTRUCTION SEQUENCE
5
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December 15, 2011
X9258
The Increment/Decrement command is different from the
other commands. Once the command is issued and the
X9258 has responded with an acknowledge, the master can
clock the selected wiper up and/or down in one segment
steps; thereby, providing a fine tuning capability to the host.
For each SCL clock pulse (tHIGH) while SDA is HIGH, the
selected wiper will move one resistor segment towards the
VH terminal.
Similarly, for each SCL clock pulse while SDA is LOW, the
selected wiper will move one resistor segment towards the
VL/RL terminal. A detailed illustration of the sequence and
timing for this operation are shown in Figures 5 and 6
respectively.
TABLE 1. INSTRUCTION SET
INSTRUCTION SET
INSTRUCTION
I3
I2
I1
I0
R1
R0
P1
P0
OPERATION
Read Wiper Counter Register
1
0
0
1
0
0
1/0
1/0
Read the contents of the Wiper Counter Register pointed to
by P1 - P0
Write Wiper Counter Register
1
0
1
0
0
0
1/0
1/0
Write new value to the Wiper Counter Register pointed to by
P1 - P0
Read Data Register
1
0
1
1
1/0
1/0
1/0
1/0
Read the contents of the Data Register pointed to by P1 - P0
and R1 - R0
Write Data Register
1
1
0
0
1/0
1/0
1/0
1/0
Write new value to the Data Register pointed to by P1 - P0
and R1 - R0
XFR Data Register to Wiper
Counter Register
1
1
0
1
1/0
1/0
1/0
1/0
Transfer the contents of the Data Register pointed to by
P1 - P0 and R1 - R0 to its associated Wiper Counter Register
XFR Wiper Counter Register to
Data Register
1
1
1
0
1/0
1/0
1/0
1/0
Transfer the contents of the Wiper Counter Register pointed
to by P1 - P0 to the Data Register pointed to by R1 - R0
Global XFR Data Registers to
Wiper Counter Registers
0
0
0
1
1/0
1/0
0
0
Transfer the contents of the Data Registers pointed to by
R1 - R0 of all four potentiometers to their respective Wiper
Counter Registers
Global XFR Wiper Counter
Registers to Data Register
1
0
0
0
1/0
1/0
0
0
Transfer the contents of both Wiper Counter Registers to
their respective data Registers pointed to by R1 - R0 of all
four potentiometers
Increment/Decrement Wiper
Counter Register
0
0
1
0
0
0
1/0
1/0
Enable Increment/decrement of the Control Latch pointed to
by P1 - P0
NOTE:
4. 1/0 = data is one or zero.
6
FN8168.6
December 15, 2011
X9258
SCL
SDA
0
S
T
A
R
T
1
0
1
A3
A2
A1
A0
A
C
K
I3
I2
I1
I0
R1
R0
P1 P0
A
C
K
D7
D6 D5 D4
D3
D2
D1 D0
A
C
K
S
T
O
P
FIGURE 4. THREE-BYTE INSTRUCTION SEQUENCE
I
SCL
SDA
S
T
A
R
T
0
1
0
1
A3
A2
A1
A0
A
C
K
I3
I2
I1
I0
R1
R0
P1
P0
A
C
K
I
N
C
1
I
N
C
2
I
N
C
n
D
E
C
1
D
E
C
n
S
T
O
P
FIGURE 5. INCREMENT/DECREMENT INSTRUCTION SEQUENCE
F
I
INC/DEC
CMD
ISSUED
tWRID
SCL
SD A
VOLTAGE OUT
VW/RW
FIGURE 6. INCREMENT/DECREMENT TIMING LIMITS
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
ACKNOWLEDGE
START
FIGURE 7. ACKNOWLEDGE RESPONSE FROM RECEIVER
7
FN8168.6
December 15, 2011
X9258
SERIAL DATA PATH
VH/RH
SERIAL
BUS
INPUT
FROM INTERFACE
CIRCUITRY
REGISTER 1
8
REGISTER 2
8
WIPER
COUNTER
REGISTER
(WCR)
REGISTER 3
INC/DEC
LOGIC
If WCR = 00[H] then VW/RW = VL/RL
If WCR = FF[H] then VW/RW = VH/RH
PARALLEL
BUS
INPUT
COUNTER DECODER
REGISTER 0
UP/DN
UP/DN
MODIFIED SCL
VL/RL
CLK
VW/RW
FIGURE 8. DETAILED POTENTIOMETER BLOCK DIAGRAM DETAILED OPERATION
All DCP potentiometers share the serial interface and share
a common architecture. Each potentiometer has a Wiper
Counter Register and four Data Registers. A detailed
discussion of the register organization and array operation
follows.
Wiper Counter Register
The X9258 contains four Wiper Counter Registers, one for
each DCP potentiometer. The Wiper Counter Register can
be envisioned as a 8-bit parallel and serial load counter with
its outputs decoded to select one of 256 switches along its
resistor array. The contents of the WCR can be altered in
four ways:
1. Written directly by the host via the Write Wiper Counter
Register instruction (serial load)
2. Written indirectly by transferring the contents of one of
four associated Data Registers via the XFR Data
Register instruction (parallel load)
3. Can be modified one step at a time by the
Increment/Decrement instruction.
4. Loaded with the contents of its data register zero (R0)
upon power-up.
The WCR is a volatile register; that is, its contents are lost
when the X9258 is powered-down. Although the register is
automatically loaded with the value in R0 upon power-up, it
should be noted this may be different from the value present
at power-down.
8
Data Registers
Each potentiometer has four nonvolatile Data Registers.
These can be read or written directly by the host and data
can be transferred between any of the four Data Registers
and the WCR. It should be noted all operations changing
data in one of these registers is a nonvolatile operation and
will take a maximum of 10ms.
If the application does not require storage of multiple
settings for the potentiometer, these registers can be used
as regular memory locations that could possibly store
system parameters or user preference data.
Register Descriptions
Data Registers, (8-bit), Nonvolatile
WP7
WP6
WP5
WP4
WP3
WP2
WP1
WP0
NV
NV
NV
NV
NV
NV
NV
NV
(MSB)
(LSB)
Four 8-bit Data Registers for each DCP (sixteen 8-bit
registers in total).
{D7~D0}: These bits are for general purpose not volatile data
storage or for storage of up to four different wiper values.
The contents of Data Register 0 are automatically moved to
the wiper counter register on power-up.
FN8168.6
December 15, 2011
X9258
the WCR can be loaded from any of the other Data Register
or directly. The contents of the WCR can be saved in a DR.
Wiper Counter Register, (8-bit), Volatile
WP7
WP6
WP5
WP4
WP3
WP2
WP1
WP0
V
V
V
V
V
V
V
V
(MSB)
Instruction Format
NOTES:
(LSB)
5. “MACK”/”SACK”: stands for the acknowledge sent by the
master/slave.
One 8-bit Wiper Counter Register for each DCP (four 8-bit
registers in total.)
6. “A3 ~ A0”: stands for the device addresses sent by the master.
7. “X”: indicates that it is a “0” for testing purpose but physically it is
a “don’t care” condition.
{D7~D0}: These bits specify the wiper position of the
respective DCP. The Wiper Counter Register is loaded on
power-up by the value in Data Register 0. The contents of
8. “I”: stands for the increment operation, SDA held high during
active SCL phase (high).
9. “D”: stands for the decrement operation, SDA held low during
active SCL phase (high).
Read Wiper Counter Register (WCR)
WIPER POSITION
INSTRUCTION
WCR
DEVICE
S DEVICE TYPE
(SENT BY SLAVE ON SDA)
M S
OPCODE
ADDRESSES S
T IDENTIFIER ADDRESSES S
A T
A
A
A
0 1 0 1 A3 A2 A1 A0
1 0 0 1 0 0 P1 P0
WP7 WP6 WP5 WP4 WP3 WP2 WP1 WP0
C O
C
C
R
K P
K
K
T
Write Wiper Counter Register (WCR)
DEVICE
S
TYPE
DEVICE
T
A IDENTIFIER ADDRESSES
R
0 1 0 1 A3 A2 A1 A0
T
S
A
C
K
INSTRUCTION
OPCODE
1
0
1
0
DATA BYTE
S
WCR
S
(SENT BY MASTER ON SDA)
A
ADDRESSES A
C
C
0 0 P1 P0
WP7 WP6 WP5 WP4 WP3 WP2 WP1 WP0
K
K
S
T
O
P
Read Data Register (DR)
DEVICE
S DEVICE TYPE
T IDENTIFIER ADDRESSES S
A
A
0 1 0 1 A3 A2 A1 A0
C
R
K
T
INSTRUCTION
OPCODE
1
0
1
1
DATA BYTE
(SENT BY SLAVE ON SDA)
M S
S
A T
A
R1 R0 P1 P0
WP7 WP6 WP5 WP4 WP3 WP2 WP1 WP0
C O
C
K P
K
DR AND WCR
ADDRESSES
Write Data Register (WR)
DEVICE
S
TYPE
DEVICE
T
A IDENTIFIER ADDRESSES
R
0 1 0 1 A3 A2 A1 A0
T
S INSTRUCTION DR AND WCR
OPCODE
ADDRESSES
A
C
1 1 0 0 R1 R0 P1 P0
K
9
DATA BYTE
S
S
(SENT BY MASTER ON SDA)
A
A
C
C
WP7 WP6 WP5 WP4 WP3 WP2 WP1 WP0
K
K
HIGH-VOLTAGE
S WRITE CYCLE
T
O
P
FN8168.6
December 15, 2011
X9258
XFR Data Register (DR) to Wiper Counter Register (WCR)
S
T
A
R
T
DEVICE
TYPE
IDENTIFIER
0
1
0
S S
A T
C O
K P
DEVICE
S INSTRUCTION DR AND WCR
OPCODE
ADDRESSES
ADDRESSES A
C
1 A3 A2 A1 A0 K 1 1 0 1 R1 R0 P1 P0
XFR Wiper Counter Register (WCR) to Data Register (DR)
S
T
A
R
T
DEVICE
TYPE
IDENTIFIER
0
1
0
DEVICE
S INSTRUCTION DR AND WCR
OPCODE
ADDRESSES
ADDRESSES A
C
1 A3 A2 A1 A0
1 1 1 0 R1 R0 P1 P0
K
S
A
C
K
HIGH-VOLTAGE
WRITE CYCLE
S
T
O
P
Increment/Decrement Wiper Counter Register (WCR)
DEVICE
S DEVICE TYPE
T IDENTIFIER ADDRESSES
A
0 1 0 1 A3 A2 A1 A0
R
T
S
A
C
K
INSTRUCTION
OPCODE
0
0
1
0
WCR
ADDRESSES
0
0
P1 P0
INCREMENT/DECREMENT
S (SENT BY MASTER ON SDA)
A
I/D I/D .
.
.
. I/D I/D
C
K
S
T
O
P
Global XFR Data Register (DR) to Wiper Counter Register (WCR)
DEVICE
S DEVICE TYPE
IDENTIFIER ADDRESSES
T
A
0 1 0 1 A3 A2 A1 A0
R
T
S
A
C
K
INSTRUCTION
DR
OPCODE
ADDRESSES
0
0
0
1 R1 R0 0
0
S
A
C
K
S
T
O
P
Global XFR Wiper Counter Register (WCR) to Data Register (DR)
DEVICE
TYPE
IDENTIFIER
0
1
0
DR
DEVICE
S INSTRUCTION
OPCODE
ADDRESSES
ADDRESSES A
C
1 A3 A2 A1 A0 K 1 0 0 0 R1 R0 0 0
Symbol Table
WAVEFORM
HIGH-VOLTAGE
WRITE CYCLE
S S
A T
C O
K P
Guidelines for Calculating Typical Values of Bus
Pull-Up Resistors
INPUTS
Must be
steady
Will be
steady
May change
from Low to
High
Will change
from Low to
High
May change
from High to
Low
Will change
from High to
Low
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
N/A
Center Line
is High
Impedance
10
120
OUTPUTS
VCC MAX
RMIN =
100
RESISTANCE (k)
S
T
A
R
T
80
IOL MIN
RMAX =
60
=1.8kΩ
tR
CBUS
MAXIMUM
RESISTANCE
40
20
0
MINIMUM
RESISTANCE
0
20
40
60
80
100
120
BUS CAPACITANCE (pF)
FN8168.6
December 15, 2011
X9258
Absolute Maximum Ratings
Thermal Information
Voltage on SDA, SCL or any Address Input
with Respect to VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . -1V to +7V
Voltage on V+ (referenced to VSS) . . . . . . . . . . . . . . . . . . . . . . .10V
Voltage on V- (referenced to VSS) . . . . . . . . . . . . . . . . . . . . . . . -10V
(V+) - (V-) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12V
Any VH/RH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V+
Any VL/RL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIW (10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±15mA
Thermal Resistance (Typical)
θJA (°C/W)
θJC (°C/W)
24 Lead SOIC (Notes 10, 11). . . . . . . .
46
21
24 Lead TSSOP (Notes 10, 11) . . . . . .
68
17
Temperature Under Bias . . . . . . . . . . . . . . . . . . . . .-65°C to +135°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Supply Voltage Range (Typical)
X9258. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V ±10%
X9258-2.7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
10. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
11. For θJC, the “case temp” location is taken at the package top center.
Analog Specifications
SYMBOL
Over recommended operating conditions, unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
(Note 12)
TYP
End-to-end Resistance Tolerance
MAX
(Note 12)
UNIT
±20
%
50
mW
±7.5
mA
Power Rating
+25°C, each potentiometer
IW
Wiper Current
Wiper current = ±1mA
RW
Wiper Resistance
IW = ± 1mA @ V+ = 3V, V- = -3V
150
250
Ω
RW
Wiper Resistance
IW = ± 1mA @ V+ = 5V, V- = -5V
40
100
Ω
V+
Voltage on V+ Pin
V-
VTERM
Voltage on V- Pin
X9258
+4.5
+5.5
V
X9258-2.7
+2.7
+5.5
V
X9258
-5.5
-4.5
V
X9258 -2.7
-5.5
-2.7
V
V-
V+
V
Voltage on any VH/RH or VL/RL Pin
Noise
Ref: 1kHz
Resolution (Note 16)
Absolute Linearity (Note 13)
Vw(n)(actual) - Vw(n)(expected)
Relative Linearity (Note 14)
Vw(n + 1) - [Vw(n) + MI]
Temperature Coefficient of RTOTAL
-120
dBV
0.6
%
Potentiometer Capacitance
11
MI
(Note 15)
±0.6
MI
(Note 15)
±300
Ratiometric Temperature Coefficient
CH/CL/CW
±1
ppm/°C
±20
See “Test Circuit #3 SPICE Macro
Model” on page 13
10/10/25
ppm/°C
pF
FN8168.6
December 15, 2011
X9258
DC Operating Characteristics
SYMBOL
Over recommended operating conditions, unless otherwise specified.
PARAMETER
MIN
(Note 12)
TEST CONDITIONS
ICC1
VCC Supply Current (Nonvolatile
Write)
fSCL = 400kHz, SDA = Open,
Other Inputs = VSS
ICC2
VCC Supply Current (Move Wiper,
Write, Read)
fSCL = 400kHz, SDA = Open,
Other Inputs = VSS
ISB
VCC Current (Standby)
ILI
TYP
MAX
(Note 12)
UNIT
1
mA
100
µA
SCL = SDA = VCC, Addr. = VSS
5
µA
Input Leakage Current
VIN = VSS to VCC
10
µA
ILO
Output Leakage Current
VOUT = VSS to VCC
10
µA
VIH
Input HIGH Voltage
VCC x 0.7
VCC + 0.1
V
VIL
Input LOW Voltage
-0.5
VCC x 0.3
V
VOL
Output LOW Voltage
0.4
V
IOL = 3mA
NOTES:
12. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested.
13. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
14. Relative linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a potentiometer. It is
a measure of the error in step size.
15. MI = RTOT/255 or (VH/RH—VL/RL)/255, single potentiometer.
16. Max = all four arrays cascaded together; typical = individual array resolutions.
Endurance and Data Retention
PARAMETER
MIN
(Note 12)
UNIT
100,000
Data changes per bit per register
100
years
Minimum Endurance
Data Retention
Capacitance
TEST CONDITIONS
MAX
(Note 12)
UNIT
CI/O (Note 17) Input/Output Capacitance (SDA)
VI/O = 0V
8
pF
CIN (Note 17)
VIN = 0V
6
pF
SYMBOL
PARAMETER
Input Capacitance (A0, A1, A2, A3, and SCL)
Power-Up Timing
SYMBOL
PARAMETER
MIN
(Note 12)
MAX
(Note 12)
UNIT
tPUR (Note 18)
Power-up to Initiation of Read Operation
1
ms
tPUW (Note 18)
Power-up to Initiation of Write Operation
5
ms
50
V/ms
tR VCC (Note 19) VCC Power-up Ramp
0.2
NOTES:
17. This parameter is periodically sampled and not 100% tested.
18. tPUR and tPUW are the delays required from the time the third (last) power supply (VCC, V+ or V-) is stable until the specific instruction can be
issued. These parameters are periodically sampled and not 100% tested.
19. Sample tested only.
12
FN8168.6
December 15, 2011
X9258
Power-Up and Power-Down Requirement
Equivalent AC Load Circuit
The are no restrictions on the sequencing of the bias supplies
VCC, V+, and V- provided that all three supplies reach their final
values within 1ms of each other. At all times, the voltages on
the potentiometer pins must be less than V+ and more than V-.
The recall of the wiper position from nonvolatile memory is not
in effect until all supplies reach their final value. The VCC ramp
rate specification is always in effect.
5V
2.7V
1533Ω
SDA OUTPUT
100pF
100pF
AC Test Conditions
Input Pulse Levels
VCC x 0.1 to VCC x 0.9
Input Rise and Fall Times
10ns
Input and Output Timing Level
VCC x 0.5
Test Circuit #3 SPICE Macro Model
MACRO MODEL
RTOTAL
RH
CL
CH
CW
10pF
RL
10pF
25pF
RW
AC Timing
Over recommended operating conditions, unless otherwise specified.
SYMBOL
PARAMETER
MIN
(Note 12)
MAX
(Note 12)
UNIT
400
kHz
fSCL
Clock Frequency
tCYC
Clock Cycle Time
2500
ns
tHIGH
Clock High Time
600
ns
tLOW
Clock Low Time
1300
ns
tSU:STA
Start Setup Time
600
ns
tHD:STA
Start Hold Time
600
ns
tSU:STO
Stop Setup Time
600
ns
tSU:DAT
SDA Data Input Setup Time
100
ns
tHD:DAT
SDA Data Input Hold Time
30
ns
tR
SCL and SDA Rise Time (Note 20)
300
ns
tF
SCL and SDA Fall Time (Note 20)
300
ns
tAA
SCL Low to SDA Data Output Valid Time
900
ns
tDH
SDA Data Output Hold Time
50
ns
Noise Suppression Time Constant at SCL and SDA Inputs
50
ns
1300
ns
TI
tBUF
Bus Free Time (Prior to any Transmission)
tSU:WPA
WP, A0, A1, A2 and A3 Setup Time
0
ns
tHD:WPA
WP, A0, A1, A2 and A3 Hold Time
0
ns
NOTE:
20. A device must internally provide a hold time of at least 300ns for the SDA signal in order to bridge the undefined region of the falling edge of SCL.
13
FN8168.6
December 15, 2011
X9258
High-Voltage Write Cycle Timing
SYMBOL
PARAMETER
tWR
High-Voltage Write Cycle Time (Store Instructions)
TYP
MAX
(Note 12)
UNIT
5
10
ms
DCP Timing
SYMBOL
MIN
MAX
(Note 12) (Note 12)
PARAMETER
UNIT
tWRPO
Wiper Response Time After the Third (Last) Power Supply is Stable
10
µs
tWRL
Wiper Response Time After Instruction Issued (All Load Instructions)
10
µs
tWRID
Wiper Response Time from an Active SCL/SCK Edge (Increment/Decrement Instruction)
10
µs
Timing Diagrams 2-Wire Interface
Start and Stop Timing
(START)
(STOP)
tR
tF
SCL
tSU:STA
tHD:STA
tSU:STO
tR
tF
SDA
Input Timing
tCYC
tHIGH
SCL
tLOW
SDA
tSU:DAT
tHD:DAT
tBUF
Output Timing
SCL
SDA
tAA
14
tDH
FN8168.6
December 15, 2011
X9258
DCP Timing (for All Load Instructions)
(STOP)
SCL
LSB
SDA
tWRL
VWx
DCP Timing (for Increment/Decrement Instruction)
SCL
SDA
WIPER REGISTER ADDRESS
INCREMENT/DECREMENT
INCREMENT/DECREMENT
tWRID
VWx
Write Protect and Device Address Pins Timing
(START)
(STOP)
SCL
...
(ANY INSTRUCTION)
...
SDA
...
tSU:WPA
tHD:WPA
WP
A0, A1
A2, A3
15
FN8168.6
December 15, 2011
X9258
Applications information
Basic Configurations of Electronic Potentiometers
VR
+VR
VW/RW
I
FIGURE 9. THREE TERMINAL POTENTIOMETER; VARIABLE
VOLTAGE DIVIDER
FIGURE 10. TWO-TERMINAL VARIABLE RESISTOR;
VARIABLE CURRENT
Application Circuits
VS
+
VO
–
VIN
VO (REG)
317
R1
R2
IADJ
R1
R2
VO = (1+ R2/R1) VS
VO (REG) = 1.25V (1+ R2/R1)+ IADJ R2
FIGURE 11. NON-INVERTING AMPLIFIER
R1
FIGURE 12. VOLTAGE REGULATOR
R2
VS
VS
100kΩ
–
–
+
VO
+
VO
TL072
10kΩ
}
+12V
10kΩ
}
10kΩ
R1
R2
VUL = {R1/(R1+R2)} VO(MAX)
VLL = {R1/(R1+R2)} VO(MIN)
-12V
FIGURE 13. OFFSET VOLTAGE ADJUSTMENT
16
FIGURE 14. COMPARATOR WITH HYSTERESIS
FN8168.6
December 15, 2011
X9258
Application Circuits (Continued)
C
VS
+
R2
R1
VS
VO
–
–
R
VO
+
R3
R2
R4
All RS = 10kΩ
R1
VO = G VS
-1/2 ≤ G ≤ +1/2
GO = 1 + R2/R1
fc = 1/(2πRC)
FIGURE 15. ATTENUATOR
FIGURE 16. FILTER
R2
R1
R2
}
VS
}
C1
VS
+
–
–
VO
+
R1
ZIN
R3
VO = G VS
G = - R2/R1
ZIN = R2 + s R2 (R1 + R3) C1 = R2 + s Leq
(R1 + R3) >> R2
FIGURE 18. EQUIVALENT L-R CIRCUIT
FIGURE 17. INVERTING AMPLIFIER
C
R2
–
R1
–
+
+
} RA
} RB
FREQUENCY ∝ R1, R2, C
AMPLITUDE ∝ RA, RB
FIGURE 19. FUNCTION GENERATOR
17
FN8168.6
December 15, 2011
X9258
Thin Shrink Small Outline Package Family (TSSOP)
MDP0044
0.25 M C A B
D
THIN SHRINK SMALL OUTLINE PACKAGE FAMILY
A
MILLIMETERS
(N/2)+1
N
SYMBOL 14 LD 16 LD 20 LD 24 LD 28 LD TOLERANCE
PIN #1 I.D.
E
E1
1
(N/2)
B
0.20 C B A
2X
N/2 LEAD TIPS
TOP VIEW
0.05
e
C
SEATING
PLANE
H
A
1.20
1.20
1.20
1.20
1.20
Max
A1
0.10
0.10
0.10
0.10
0.10
±0.05
A2
0.90
0.90
0.90
0.90
0.90
±0.05
b
0.25
0.25
0.25
0.25
0.25
+0.05/-0.06
c
0.15
0.15
0.15
0.15
0.15
+0.05/-0.06
D
5.00
5.00
6.50
7.80
9.70
±0.10
E
6.40
6.40
6.40
6.40
6.40
Basic
E1
4.40
4.40
4.40
4.40
4.40
±0.10
e
0.65
0.65
0.65
0.65
0.65
Basic
L
0.60
0.60
0.60
0.60
0.60
±0.15
L1
1.00
1.00
1.00
1.00
1.00
Reference
Rev. F 2/07
0.10 M C A B
b
0.10 C
N LEADS
SIDE VIEW
NOTES:
1. Dimension “D” does not include mold flash, protrusions or gate
burrs. Mold flash, protrusions or gate burrs shall not exceed
0.15mm per side.
2. Dimension “E1” does not include interlead flash or protrusions.
Interlead flash and protrusions shall not exceed 0.25mm per
side.
SEE DETAIL “X”
3. Dimensions “D” and “E1” are measured at dAtum Plane H.
4. Dimensioning and tolerancing per ASME Y14.5M-1994.
c
END VIEW
L1
A
A2
GAUGE
PLANE
0.25
L
A1
0° - 8°
DETAIL X
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
18
FN8168.6
December 15, 2011
X9258
Package Outline Drawing
M24.3
24 LEAD WIDE BODY SMALL OUTLINE PLASTIC PACKAGE (SOIC)
Rev 2, 3/11
24
INDEX
AREA
7.60 (0.299)
7.40 (0.291) 10.65 (0.419)
10.00 (0.394)
DETAIL "A"
1
2
3
TOP VIEW
1.27 (0.050)
0.40 (0.016)
SEATING PLANE
2.65 (0.104)
2.35 (0.093)
15.60 (0.614)
15.20 (0.598)
0.75 (0.029)
x 45°
0.25 (0.010)
0.30 (0.012)
0.10 (0.004)
1.27 (0.050)
0.51 (0.020)
0.33 (0.013)
8°
0°
0.32 (0.012)
0.23 (0.009)
SIDE VIEW “B”
SIDE VIEW “A”
1.981 (0.078)
9.373 (0.369)
1.27 (0.050)
NOTES:
1. Dimensioning and tolerancing per ANSI Y14.5M-1982.
2. Package length does not include mold flash, protrusions or gate
burrs. Mold flash, protrusion and gate burrs shall not exceed
0.15mm (0.006 inch) per side.
3. Package width does not include interlead flash or protrusions.
Interlead flash and protrusions shall not exceed 0.25mm
(0.010 inch) per side.
4. The chamfer on the body is optional. If it is not present, a visual
index feature must be located within the crosshatched area.
5. Terminal numbers are shown for reference only.
6. The lead width as measured 0.36mm (0.014 inch) or greater above
the seating plane, shall not exceed a maximum value of 0.61mm
(0.024 inch).
7. Controlling dimension: MILLIMETER. Converted inch dimensions in
( ) are not necessarily exact.
8. This outline conforms to JEDEC publication MS-013-AD ISSUE C.
0.533 (0.021)
TYPICAL RECOMMENDED LAND PATTERN
19
FN8168.6
December 15, 2011
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