X9401
®
Low Noise/Low Power/SPI Bus
Data Sheet
October 13, 2009
FN8190.4
Quad, 64 Tap, Digitally Controlled
Potentiometer (XDCP™)
Features
Description
• Nonvolatile Storage of Wiper Position
The X9401 integrates 4 digitally controlled potentiometers
(XDCP) on a monolithic CMOS integrated microcircuit.
• Four Nonvolatile Data Registers for Each Pot
The digitally controlled potentiometer is implemented using
64 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 SPI bus interface. Each
potentiometer has associated with it a volatile Wiper Counter
Register (WCR) and 4 nonvolatile 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 through the switches. Power-up
recalls the contents of DR0 to the WCR.
• SPI Serial Interface
• Quad - 4 Separate Pots, 64 Taps/Pot
• 16-bytes of EEPROM Memory
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.
• RTOTAL = 10kΩ
• Wiper Resistance = 150Ω Typical
• Standby Current < 3µA (Total Package)
• Operating Current < 700µA max.
• VCC = 2.7V to 5V
• 24 Ld SOIC and 24 Ld TSSOP Package
• 100 year Data Retention
• Pb-Free Available (RoHS Compliant)
Block Diagram
POT 0
VCC
VSS
R0
R2
HOLD
R1
R3
VH0/RH0
WIPER
COUNTER
REGISTER
(WCR)
VL0/RL0
CS
SCK
SO
SI
A0
A1
R0
R2
R1
R3
WIPER
COUNTER
REGISTER
(WCR)
RESISTOR
ARRAY
POT 2
VL2/RL2
VW0/RW0
INTERFACE
AND
CONTROL
CIRCUITRY
VH2/RH2
VW2/RW2
8
VW1/RW1
DATA
WP
R0
R2
1
R1
R3
WIPER
COUNTER
REGISTER
(WCR)
RESISTOR
ARRAY
POT 1
VH1/RH1
VL1/RL1
VW3/RW3
R0
R2
R1
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 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005-2006, 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
X9401
Ordering Information
PART
NUMBER
PART
MARKING
VCC
LIMITS
(V)
POTENTIOMETER
ORGANIZATION
(kΩ)
TEMP
RANGE
(°C)
5 ±10%
10
-40 to +85
24 Ld SOIC (300 mil) (Pb-free)
M24.3
PACKAGE
PKG.
DWG. #
X9401WS24IZ* (Note 1)
X9401WS ZI
X9401WS24I
X9401WS I
-40 to +85
24 Ld SOIC (300 mil)
M24.3
X9401WS24Z* (Note 1)
X9401WS Z
-40 to +85
24 Ld SOIC (300 mil)
M24.3
X9401WV24IZ* (Note 1)
X9401WV ZI
-40 to +85
24 Ld TSSOP (4.4mm) (Pb-free) MDP0044
X9401WV24Z* (Note 1)
X9401WV Z
-40 to +85
24 Ld TSSOP (4.4mm) (Pb-free) MDP0044
X9401WS24I-2.7* (Note 2) X9401WS G
-40 to +85
24 Ld SOIC (300 mil)
M24.3
X9401WS ZG
-40 to +85
24 Ld SOIC (300 mil) (Pb-free)
M24.3
X9401WS24Z-2.7* (Note 1) X9401WS ZF
-40 to +85
24 Ld SOIC (300 mil) (Pb-free)
M24.3
X9401WV24-2.7
-40 to +85
24 Ld TSSOP (4.4mm)
MDP0044
X9401WS24IZ-2.7* (Note)
2.7 to 5.5
X9401WV F
X9401WV24IZ-2.7* (Note 1) X9401WV ZG
-40 to +85
24 Ld TSSOP (4.4mm) (Pb-free) MDP0044
X9401WV24Z-2.7* (Note 1) X9401WV ZF
-40 to +85
24 Ld TSSOP (4.4mm) (Pb-free) MDP0044
*Add “T1” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
NOTES:
1. 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.
2. Not recommended for new designs.
Pin Descriptions
HOLD (HOLD)
Host Interface Pins
SERIAL OUTPUT (SO)
SO is a push/pull serial data output pin. During a read cycle,
data is shifted out on this pin. Data is clocked out by the
falling edge of the serial clock.
SERIAL INPUT
SI is the serial data input pin. All opcodes, byte addresses
and data to be written to the pots and pot registers are input
on this pin. Data is latched by the rising edge of the serial
clock.
SERIAL CLOCK (SCK)
The SCK input is used to clock data into and out of the
X9401.
CHIP SELECT (CS)
When CS is HIGH, the X9401 is deselected and the SO pin
is at high impedance, and (unless an internal write cycle is
underway) the device will be in the standby state. CS LOW
enables the X9401, placing it in the active power mode. It
should be noted that after a power-up, a HIGH to LOW
transition on CS is required prior to the start of any
operation.
HOLD is used in conjunction with the CS pin to select the
device. Once the part is selected and a serial sequence is
underway, HOLD may be used to pause the serial
communication with the controller without resetting the serial
sequence. To pause, HOLD must be brought LOW while
SCK is LOW. To resume communication, HOLD is brought
HIGH, again while SCK is LOW. If the pause feature is not
used, HOLD should be held HIGH at all times.
DEVICE ADDRESS (A0 - A1)
The address inputs are used to set the least significant 2 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 X9401. A maximum of 4
devices may occupy the SPI serial bus.
Potentiometer Pins
VH (VH0 - VH3)/ RH (RH0 - RH3),
VL (VL0 - VL3)/RL (RL0 - RL3)
The VH/RH and VL/RL inputs are equivalent to the terminal
connections on either end of a mechanical potentiometer.
VW (VW0 - VW3)/ RW (RW0 - RW3)
The wiper outputs are equivalent to the wiper output of a
mechanical potentiometer.
HARDWARE WRITE PROTECT INPUT (WP)
The WP pin when LOW prevents nonvolatile writes to the
Wiper Counter Registers.
2
FN8190.4
October 13, 2009
X9401
Pinouts
Device Description
X9401
(24 LD SOIC)
TOP VIEW
24 NC
VCC 1
VL0/RL0 2
23 VL3/RL3
VH0/RH0 3
22 VH3/RH3
VW0/RW0 4
21 VW3/RW3
CS 5
20 A0
WP 6
19 S0
SI 7
18 HOLD
A1 8
17 SCK
VL1/RL1 9
16 VL2/RL2
VH1/RH1 10
15 VH2/RH2
VW1/RW1 11
14 VW2/RW2
13 NC
VSS 12
SI 1
24 WP
A1 2
23 CS
VL1/RL1 3
22 VW0/RW0
VH1/RH1 4
21 VH0/RH0
VW1/RW1 5
20 VL0/RL0
VSS 6
19 VCC
NC 7
18 NC
VW2/RW2 8
17 VL3/RL3
VH2/RH2 9
16 VH3/RH3
VL2/RL2 10
15 VW3/RW3
SCK 11
14 A0
HOLD 12
13 S0
Pin Descriptions
5
23
SYMBOL
DESCRIPTION
CS
Chip select
17
11
SCK
Serial Clock
7, 19
1, 13
SI, S0
Serial Data
20, 8
14, 2
A0 - A1
Device Address
3, 10, 21, 4,
15, 22, 9, 16,
20, 3,
2, 9,
16, 23 10, 17
VH0/RH0,VH1/RH1, Potentiometer end
VH2/RH2, VH3/RH3, terminals
VL0/RL0, VL1/RL1,
VL2/RL2, VL3/RL3
4, 11,
14, 21
22, 5,
8, 15
VW0/RW0, VW1/RW1, Wipers
VW2/RW2, VW3/RW3
6
24
WP
18
12
HOLD
1
19
VCC
12
6
VSS
System Ground
13, 24
7, 18
NC
No Connection
Hardware Write Protection
Hardware Hold
System Supply Voltage
3
Serial Interface
The X9401 supports the SPI interface hardware
conventions. The device is accessed via the SI input with
data clocked in on the rising SCK. CS must be LOW and the
HOLD and WP pins must be HIGH during the entire
operation.
The SO and SI pins can be connected together, since they
have three state outputs. This can help to reduce system pin
count.
Array Description
X9401
(24 LD TSSOP)
TOP VIEW
SOIC TSSOP
PIN # PIN #
The X9401 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 XDCP
potentiometers.
The X9401 is comprised of four resistor arrays. Each array
contains 63 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).
At both ends of each array and between each resistor
segment is a CMOS switch connected to the wiper (VW/RW)
output. Within each individual array only one switch may be
turned on at a time.
These switches are controlled by a Wiper Counter Register
(WCR). The six bits of the WCR are decoded to select, and
enable, one of sixty-four switches.
Wiper Counter Register (WCR)
The X9401 contains four Wiper Counter Registers, one for
each XDCP potentiometer. The WCR is equivalent to a
serial-in, parallel-out register/counter with its outputs
decoded to select one of sixty-four switches along its resistor
array. The contents of the WCR can be altered in four ways:
it may be written directly by the host via the Write Wiper
Counter Register instruction (serial load); it may be written
indirectly by transferring the contents of one of four
associated data registers via the XFR Data Register or
Global XFR Data Register instructions (parallel load); it can
be modified one step at a time by the Increment/Decrement
instruction. Finally, it is loaded with the contents of its data
register zero (R0) upon power-up.
The Wiper Counter Register is a volatile register; that is, its
contents are lost when the X9401 is powered-down.
Although the register is automatically loaded with the value
in R0 upon power-up, this may be different from the value
present at power-down. The wiper position must be stored in
R0 to insure restoring the wiper position after power-up.
FN8190.4
October 13, 2009
X9401
Data Registers
Instruction Byte
Each potentiometer has four 6-bit nonvolatile data registers.
These can be read or written directly by the host. Data can
also be transferred between any of the four data registers
and the associated Wiper Counter Register. All operations
changing data in one of the data registers is a nonvolatile
operation and will take a maximum of 10ms.
The next byte sent to the X9401 contains the instruction and
register pointer information. The four most significant bits are
the instruction. The next four bits point to one of the four pots
and, when applicable, they point to one of four associated
registers. The format is shown below in Figure 2.
If the application does not require storage of multiple
settings for the potentiometer, the data registers can be used
as memory locations for system parameters or user
preference data.
I
I3
I2
I1
INSTRUCTIONS
I0
R1
R0
P1
P0
POT SELECT
DATA REGISTER DETAIL
FIGURE 2. IDENTIFICATION BYTE FORMAT
(MSB)
(LSB)
D5
D4
D3
D2
D1
D0
NV
NV
NV
NV
NV
NV
Write in Process
The contents of the Data Registers are saved to nonvolatile
memory when the CS pin goes from LOW to HIGH after a
complete write sequence is received by the device. The
progress of this internal write operation can be monitored by
a Write In Process bit (WIP). The WIP bit is read with a Read
Status command.
Instructions
Identification (ID) Byte
The first byte sent to the X9401 from the host, following a CS
going HIGH to LOW, is called the Identification byte. The
most significant four bits of the slave address are a device
type identifier. For the X9401 this is fixed as 0101[B] (refer to
Figure 1).
The two least significant bits in the ID byte select one of four
devices on the bus. The physical device address is defined
by the state of the A0 - A1 input pins. The X9401 compares
the serial data stream with the address input state; a
successful compare of both address bits is required for the
X9401 to successfully continue the command sequence.
The A0 - A1 inputs can be actively driven by CMOS input
signals or tied to VCC or VSS. The remaining two bits in the
slave byte must be set to 0.
DEVICE TYPE
IDENTIFIER
0
1
0
1
0
0
A1
A0
DEVICE ADDRESS
FIGURE 1. IDENTIFICATION BYTE FORMAT
4
The four high order bits of the instruction byte specify the
operation. The next two 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 two bits (P1 and P0)
selects which one of the four potentiometers is to be affected
by the instruction.
Four of the ten instructions are two bytes in length and end
with the transmission of the instruction byte. These
instructions are:
• XFR Data Register to Wiper Counter Register: This
transfers the contents of one specified Data Register to
the associated Wiper Counter Register.
• XFR Wiper Counter Register to Data Register: This
transfers the contents of the specified Wiper Counter
Register to the specified associated Data Register.
• Global XFR Data Register to Wiper Counter Register: This
transfers the contents of all specified Data Registers to the
associated Wiper Counter Registers.
• Global XFR Wiper Counter Register to Data
Register: This transfers the contents of all Wiper Counter
Registers to the specified associated Data Registers.
The basic sequence of the two byte instructions is illustrated
in Figure 3. These two-byte instructions exchange data
between the WCR and one of the data registers. A transfer
from a data register to a WCR is essentially a write to a static
RAM, with the static RAM controlling the wiper position. The
response of the wiper to this action will be delayed by tWRL.
A transfer from the WCR (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, where the
transfer occurs between all potentiometers and one
associated register.
Five instructions require a three-byte sequence to complete.
These instructions transfer data between the host and the
X9401; either between the host and one of the data registers
FN8190.4
October 13, 2009
X9401
segment steps; thereby, providing a fine tuning capability to
the host. For each SCK clock pulse (tHIGH) while SI is HIGH,
the selected wiper will move one resistor segment towards
the VH/RH terminal. Similarly, for each SCK clock pulse
while SI 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
Figure 6 and Figure 7.
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 pot,
• Write Wiper Counter Register: change current wiper
position of the selected pot,
• Read Data Register: read the contents of the selected
data register;
• Write Data Register: write a new value to the selected data
register.
• Read Status: This command returns the contents of the
WIP bit which indicates if the internal write cycle is in
progress.
The sequence of these operations is shown in Figure 4 and
Figure 5.
The final command is Increment/Decrement. It is different
from the other commands, because it’s length is
indeterminate. Once the command is issued, the master can
clock the selected wiper up and/or down in one resistor
Detailed Potentiometer Block Diagram
(ONE OF FOUR ARRAYS)
SERIAL DATA PATH
SERIAL
BUS
INPUT
FROM INTERFACE
CIRCUITRY
REGISTER 0
REGISTER 1
8
REGISTER 2
IF WCR = 00[H] THEN VW/RW = VL/RL
IF WCR = 3F[H] THEN VW/RW = VH/RH
6
PARALLEL
BUS
INPUT
WIPER
COUNTER
REGISTER
(WCR)
REGISTER 3
VH/RH
C
O
U
N
T
E
R
D
E
C
O
D
E
INC/DEC
LOGIC
UP/DN
MODIFIED SCL
UP/DN
CLK
VL/RL
VW/RW
5
FN8190.4
October 13, 2009
X9401
CS
SCK
SI
0
1
0
1
0
0
A1
A0
I3
I2
I1
I0
R1
R0
P1
P0
FIGURE 3. TWO-BYTE COMMAND SEQUENCE
CS
SCL
SI
0
1
0
0
1
0
A1
A0
I3
I2
I1
I0
R1
R0
P1 P0
0
0
D5 D4
D3
D2
D1 D0
D2
D1 D0
I
N
C
N
D
E
C
1
FIGURE 4. THREE-BYTE COMMAND SEQUENCE (WRITE)
CS
SCL
SI
DON’T CARE
0
1
0
0
1
0
A1
A0
I3
I2
I1
I0
R1
R0
P1 P0
S0
0
0
D5 D4
D3
FIGURE 5. THREE-BYTE COMMAND SEQUENCE (READ)
CS
SCK
SI
0
1
0
1
0
0
A1
A0
I3
I2
I1
I0
0
0
P1
P0
I
N
C
1
I
N
C
2
D
E
C
N
FIGURE 6. INCREMENT/DECREMENT COMMAND SEQUENCE
6
FN8190.4
October 13, 2009
X9401
TWRID
SCK
SI
VOLTAGE OUT
VW/RW
INC/DEC CMD ISSUED
FIGURE 7. INCREMENT/DECREMENT TIMING LIMITS
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
P1
P0
Read the contents of the Wiper Counter Register pointed to by
P1 - P0
Write Wiper Counter Register
1
0
1
0
0
0
P1
P0
Write new value to the Wiper Counter Register
pointed to by P1 - P0
Read Data Register
1
0
1
1
R1
R0
P1
P0
Read the contents of the Data Register pointed to by P1 - P0 and
R1 - R0
Write Data Register
1
1
0
0
R1
R0
P1
P0
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
R1
R0
P1
P0
Transfer the contents of the Data Register pointed to by R1 - R0
to the Wiper Counter Register pointed to by P1 - P0
XFR Wiper Counter Register to
Data Register
1
1
1
0
R1
R0
P1
P0
Transfer the contents of the Wiper Counter Register pointed to by
P1 - P0 to the Register pointed to by
R1 - R0
Global XFR Data Register to Wiper
Counter Register
0
0
0
1
R1
R0
0
0
Transfer the contents of the Data Registers pointed to by R1 - R0
of all four pots to their respective Wiper Counter Register
Global XFR Wiper Counter Register
to Data Register
1
0
0
0
R1
R0
0
0
Transfer the contents of all Wiper Counter Registers to their
respective data Registers pointed to by
R1 - R0 of all four pots
Increment/Decrement Wiper
Counter Register
0
0
1
0
0
0
P1
P0
Enable Increment/decrement of the Wiper Counter Register
pointed to by P1 - P0
Read Status (WIP bit)
0
1
0
1
0
0
0
1
Read the status of the internal write cycle, by
checking the WIP bit.
7
FN8190.4
October 13, 2009
X9401
Instruction Format
NOTES:
3. A1 ~ A0”: stands for the device addresses sent by the master.
4. WPx refers to wiper position data in the Counter Register
5. “I”: stands for the increment operation, SI held HIGH during active SCK phase (high).
6. “D”: stands for the decrement operation, SI held LOW during active SCK phase (high).
Read Wiper Counter Register (WCR)
DEVICE
TYPE
IDENTIFIER
CS
FALLING
EDGE
0
1
0
1
DEVICE
ADDRESSES
0
0
A1
INSTRUCTION
OPCODE
A0
1
0
0
WCR
ADDRESSES
1
0
0
P1
P0
WIPER POSITION
(SENT BY X9401 ON SO)
0
0
WP5 WP4 WP3 WP2 WP1
WP0
CS
RISING
EDGE
Write Wiper Counter Register (WCR)
CS
FALLING
EDGE
DEVICE
TYPE
IDENTIFIER
0
1
0
1
DEVICE
ADDRESSES
0
0
A1
INSTRUCTION
OPCODE
A0
1
0
1
WCR
ADDRESSES
0
0
0
P1
P0
DATA BYTE
(SENT BY HOST ON SI)
0
0
WP5 WP4 WP3 WP2
WP1
CS
RISING
WP0 EDGE
Read Data Register (DR)
CS
FALLING
EDGE
DEVICE
TYPE
IDENTIFIER
0
1
0
DEVICE
ADDRESSES
1
0
0
A1
INSTRUCTION
OPCODE
A0
1
0
1
DR AND WCR
ADDRESSES
1
R1
R0
P1
P0
DATA BYTE
(SENT BY X9401 ON SO)
0
0
WP5 WP4 WP3
WP2
WP1
WP0
CS
RISING
EDGE
Write Data Register (DR)
CS
FALLING
EDGE
DEVICE TYPE
DEVICE
INSTRUCTION
IDENTIFIER ADDRESSES
OPCODE
0
1
0
1
0 0 A1 A0
1
1
0
0
DR AND WCR
ADDRESSES
DATA BYTE
(SENT BY HOST ON SI)
HIGHCS
VOLTAGE
WRITE
RISING
R1 R0 P1 P0 0 0 WP5 WP4 WP3 WP2 WP1 WP0
CYCLE
EDGE
Transfer Data Register (DR) to Wiper Counter Register (WCR)
CS
FALLING
EDGE
DEVICE
TYPE
IDENTIFIER
0
1
0
1
DEVICE
ADDRESSES
0
0
A1
A0
INSTRUCTION
OPCODE
1
1
0
DR AND WCR
ADDRESSES
CS
RISING
R1 R0 P1 P0 EDGE
1
Transfer Wiper Counter Register (WCR) to Data Register (DR)
CS
FALLING
EDGE
DEVICE
TYPE
IDENTIFIER
0
1
0
1
DEVICE
ADDRESSES
0
0
A1
INSTRUCTION
OPCODE
A0
1
1
1
0
DR AND WCR
ADDRESSES
R1
CS
RISING
P1 P0 EDGE
R0
HIGH-VOLTAGE
WRITE CYCLE
Increment/Decrement Wiper Counter Register (WCR)
CS
FALLING
EDGE
DEVICE TYPE
IDENTIFIER
0
1
0
1
DEVICE
ADDRESSES
0
0
A1
A0
INSTRUCTION
OPCODE
0
0
1
0
WCR
ADDRESSES
X
X
P1
P0
INCREMENT/DECREMENT
(SENT BY MASTER ON SDA)
I/D
I/D
.
.
.
.
I/D
I/D
CS
RISING
EDGE
Global Transfer Data Register (DR) to Wiper Counter Register (WCR)
CS
FALLING
EDGE
DEVICE TYPE
IDENTIFIER
0
1
0
1
DEVICE
ADDRESSES
0
0
8
A1
A0
INSTRUCTION
OPCODE
0
0
0
1
DR
ADDRESSES
R1
R0
0
0
CS
RISING
EDGE
FN8190.4
October 13, 2009
X9401
Global Transfer Wiper Counter Register (WCR) to Data Register (DR)
CS
FALLING
EDGE
DEVICE
TYPE
IDENTIFIER
0
1
0
DEVICE
ADDRESSES
1
0
0
A1
INSTRUCTION
OPCODE
A0
1
0
0
DR
ADDRESSES
0
R1
R0
0
0
CS
RISING
EDGE
HIGH-VOLTAGE
WRITE CYCLE
Read Status
CS
FALLING
EDGE
DEVICE
TYPE
IDENTIFIER
0
1
0
1
DEVICE
ADDRESSES
0
0
9
A1
A0
INSTRUCTION
OPCODE
WIPER
ADDRESSES
0
0
1
0
1
0
0
1
DATA BYTE
(SENT BY X9401 ON SO)
0
0
0
0
0
0
0
WIP
CS
RISING
EDGE
FN8190.4
October 13, 2009
X9401
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VCC Limits)
X9401 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ±10%
X9401-2.7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Voltage on SCK, SCL or any address input
with respect to VSS: . . . . . . . . . . . . . . . . . . . . . . . . . . . -1V to +7V
ΔV = |(VH–VL)| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
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
Commercial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Industrial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
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.
Analog Specifications
SYMBOL
RTOTAL
(Over recommended operating conditions unless otherwise stated.)
PARAMETER
End to End resistance Tolerance
Power Rating
MIN
(Note 10)
TYP
-20
+25°C, each pot
IW
Wiper Current
RW
Wiper Resistance
VTERM
TEST CONDITION
-6
IW = (VH - VL)/RTOTAL VCC = 5V
Voltage on any VH or VL Pin
Noise
150
VSS
Ref: 1kHz
Resolution
Absolute Linearity (Note 7)
VW(n)(actual) - VW(n)(expected)
Relative Linearity (Note 8)
Vw(n+1) - [Vw(n)+ MI]
Temperature Coefficient of RTOTAL
V(RH) = VCC, V(RL) = VSS
Ratiometric Temperature Coefficient
CH/CL/CW
Potentiometer Capacitances
See Macro model
IAL
RH, RL, RW Leakage Current
VIN = VSS Device is in Stand-by mode.
MAX
(Note 10)
UNIT
+20
%
50
mW
+6
mA
500
Ω
VCC
V
-120
dBV
1.6
%
-1
+1
MI
(Note 9)
-0.2
+0.2
MI
(Note 9)
±300
ppm/°C
±20
ppm/°C
10/10/25
pF
0.1
10
µA
NOTES:
7. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
8. 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.
9. MI = RTOT/63 or (VH - VL)/63, single pot.
10. 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.
Power-up and Down Requirements
The are no restrictions on the power-up or power-down
conditions of VCC and the voltages applied to the potentiometer pins provided that VCC is always more positive than
or equal to VH, VL, and VW, i.e., VCC ≥ VH, VL, VW.
The VCC power-up spec is always in effect.
10
FN8190.4
October 13, 2009
X9401
DC Operating Characteristics (Over the recommended operating conditions unless otherwise specified.)
SYMBOL
PARAMETER
MIN
(Note 10)
TEST CONDITIONS
TYP
MAX
(Note 10)
UNIT
ICC1
VCC Supply Current (active)
fSCK = 2MHz, SO = Open, Other Inputs = VSS
700
µA
ICC2
VCC Supply Current (non-volatile write)
fSCK = 2MHz, SO = Open, Other Inputs = VSS
3
mA
ISB
VCC Current (standby)
SCK = SI = VSS, Addr. = VSS, CS = VCC
3
µA
ILI
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 +0.5
V
VIL
Input LOW Voltage
–0.5
VCC x 0.1
V
VOL
Output LOW Voltage
0.4
V
IOL = 3mA
Endurance and Data Retention
PARAMETER
MIN.
Minimum endurance
100,000
Data retention
100
UNIT
Data changes per bit per register
years
Capacitance
SYMBOL
TEST
TYP.
UNIT
TEST CONDITION
COUT
(Note 11)
Output capacitance (SO)
8
pF
VOUT = 0V
CIN
(Note 11)
Input capacitance (A0, A1, SI, and SCK)
6
pF
VIN = 0V
Power-up Timing
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.
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
0.2
50
V/ms
tr VCC
(Note 11)
VCC Power-up rate
tPUR
(Note 12)
Power-up to initiation of read operation
1
ms
tPUW
(Note 12)
Power-up to initiation of write operation
5
ms
NOTES:
11. This parameter is not 100% tested.
12. tPUR and tPUW are the delays required from the time the (last) power supply (VCC-) is stable until the specific instruction can be issued. These
parameters are periodically sampled and not 100% tested.
Equivalent AC Load Circuit
SPICE MACRO MODEL
5V
1533Ω
RTOTAL
RH
SDA
OUTPUT
CW
CL
RL
CL
10pF
25pF
100pF
10pF
RW
11
FN8190.4
October 13, 2009
X9401
AC Timing
SYMBOL
PARAMETER
MIN.
(Note 10)
MAX.
(Note 10)
UNIT
2.0
MHz
fSCK
SSI/SPI clock frequency
tCYC
SSI/SPI clock cycle rime
500
ns
tWH
SSI/SPI clock high rime
200
ns
tWL
SSI/SPI clock low time
200
ns
tLEAD
Lead time
250
ns
tLAG
Lag time
250
ns
tSU
SI, SCK, HOLD and CS input setup time
50
ns
tH
SI, SCK, HOLD and CS input hold time
50
ns
tRI
SI, SCK, HOLD and CS input rise time
2
µs
tFI
SI, SCK, HOLD and CS input fall time
2
µs
500
ns
150
ns
tDIS
SO output disable time
0
tV
SO output valid time
tHO
SO output hold time
tRO
SO output rise time
50
ns
tFO
SO output fall time
50
ns
tHOLD
0
ns
HOLD time
400
ns
tHSU
HOLD setup time
100
ns
tHH
HOLD hold time
100
ns
tHZ
HOLD low to output in high Z
100
ns
tLZ
HOLD high to output in low Z
100
ns
TI
Noise suppression time constant at SI, SCK, HOLD and CS inputs
20
ns
tCS
CS deselect time
2
µs
tWPASU
WP, A0 and A1 setup time
0
ns
tWPAH
WP, A0 and A1 hold time
0
ns
High-voltage Write Cycle Timing
SYMBOL
tWR
PARAMETER
High-voltage write cycle time (store instructions)
TYP
MAX
(Note 10)
UNIT
5
10
ms
XDCP Timing
MAX.
(Note 10)
UNIT
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)
450
ns
SYMBOL
tWRPO
PARAMETER
12
MIN.
FN8190.4
October 13, 2009
X9401
Symbol Table
WAVEFORM
INPUTS
OUTPUTS
MUST BE
STEADY
WILL BE
STEADY
MAY CHANGE
FROM LO W TO
HIGH
WILL CHANGE
FROM LO
W 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
Timing Diagrams
Input Timing
tCS
CS
SCK
tSU
tH
...
tWH
tWL
tRI
tFI
...
MSB
SI
tLAG
tCYC
tLEAD
LSB
HIGH IMPEDANCE
SO
Output Timing
CS
SCK
...
tV
MSB
SO
SI
tHO
tDIS
...
LSB
ADDR
13
FN8190.4
October 13, 2009
X9401
Hold Timing
CS
tHSU
tHH
SCK
...
tRO
tFO
SO
tHZ
tLZ
SI
tHOLD
HOLD
XDCP Timing (for All Load Instructions)
CS
SCK
...
tWRL
...
MSB
SI
LSB
VW/RW
SO
HIGH IMPEDANCE
XDCP Timing (for Increment/Decrement Instruction)
CS
SCK
...
tWRID
...
VW/RW
ADDR
SI
INC/DEC
INC/DEC
...
HIGH IMPEDANCE
SO
Write Protect and Device Address Pins Timing
(ANY INSTRUCTION)
CS
tWPASU
tWPAH
WP
A0
A1
14
FN8190.4
October 13, 2009
X9401
Applications information
Basic Configurations of Electronic Potentiometers
+VR
VR
VW/RW
I
THREE TERMINAL POTENTIOMETER;
TWO TERMINAL VARIABLE RESISTOR;
VARIABLE VOLTAGE DIVIDER
VARIABLE CURRENT
Application Circuits
NONINVERTING AMPLIFIER
VS
VOLTAGE REGULATOR
+
VIN
VO
–
VO (REG)
317
R1
R2
IADJ
R1
R2
VO (REG) = 1.25V (1+R2/R1)+IADJ R2
VO = (1+R2/R1)VS
OFFSET VOLTAGE ADJUSTMENT
R1
COMPARATOR WITH HYSTERESIS
R2
VS
VS
–
VO
+
–
100KΩ
VO
+
10KΩ
10KΩ
}
10KΩ
}
TL072
R1
R2
VUL = {R1/(R1+R2)} VO(MAX)
VLL = {R1/(R1+R2)} VO(MIN)
+5V
ATTENUATOR
FILTER
C
VS
+
R2
R1
–
VS
+
VO
–
VO
R
R3
R2
R4
ALL RS = 10KΩ
R1
VO = G VS
GO = 1 + R2/R1
-1/2 ≤ G ≤ +1/2
fc = 1/(2πRC)
15
FN8190.4
October 13, 2009
X9401
Application Circuits (continued)
}
VS
R2
}
INVERTING AMPLIFIER
R1
EQUIVALENT L-R CIRCUIT
R2
C1
VS
–
+
VO
+
–
R1
ZIN
R3
V O = G VS
G = - R2/R1
ZIN = R2 + S R2 (R1 + R3) C1 = R2 + S LEQ
(R1 + R3) >> R2
FUNCTION GENERATOR
C
R2
–
R1
–
+
} RA
+
} RB
FREQUENCY µ R1, R2, C
AMPLITUDE µ RA, RB
16
FN8190.4
October 13, 2009
X9401
Small Outline Plastic Packages (SOIC)
M24.3 (JEDEC MS-013-AD ISSUE C)
N
24 LEAD WIDE BODY SMALL OUTLINE PLASTIC PACKAGE
INDEX
AREA
H
0.25(0.010) M
B M
INCHES
E
SYMBOL
-B1
2
3
L
SEATING PLANE
-A-
A
D
h x 45°
-C-
e
A1
B
0.25(0.010) M
C
0.10(0.004)
C A M
MIN
MAX
MIN
MAX
NOTES
A
0.0926
0.1043
2.35
2.65
-
A1
0.0040
0.0118
0.10
0.30
-
B
0.013
0.020
0.33
0.51
9
C
0.0091
0.0125
0.23
0.32
-
D
0.5985
0.6141
15.20
15.60
3
E
0.2914
0.2992
7.40
7.60
4
e
α
B S
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of
Publication Number 95.
0.05 BSC
1.27 BSC
-
H
0.394
0.419
10.00
10.65
-
h
0.010
0.029
0.25
0.75
5
L
0.016
0.050
0.40
1.27
6
N
α
NOTES:
MILLIMETERS
24
0°
24
8°
0°
7
8°
Rev. 1 4/06
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” 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.
4. Dimension “E” does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per
side.
5. The chamfer on the body is optional. If it is not present, a visual index
feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. The lead width “B”, 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)
10. Controlling dimension: MILLIMETER. Converted inch dimensions
are not necessarily exact.
17
FN8190.4
October 13, 2009
X9401
Thin Shrink Small Outline Package Family (TSSOP)
MDP0044
0.25 M C A B
D
THIN SHRINK SMALL OUTLINE PACKAGE FAMILY
A
(N/2)+1
N
MILLIMETERS
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
FN8190.4
October 13, 2009