ON CAT5241WI-25 Quad digitally programmable potentiometer with 64 taps and iâ²c interface Datasheet

CAT5241
Quad Digitally Programmable Potentiometer (DPP™) with
64 Taps and I²C Interface
FEATURES
DESCRIPTION
„ Four linear-taper digitally programmable
potentiometers
„ 64 resistor taps per potentiometer
„ End to end resistance 2.5kΩ, 10kΩ, 50kΩ or
100kΩ
„ Potentiometer control and memory access via
I²C interface
„ Low wiper resistance, typically 80Ω
„ Nonvolatile memory storage for up to four
wiper settings for each potentiometer
„ Automatic recall of saved wiper settings at
power up
„ 2.5 to 6.0 volt operation
„ Standby current less than 1µA
„ 1,000,000 nonvolatile WRITE cycles
„ 100 year nonvolatile memory data retention
„ 20-lead SOIC and TSSOP packages
„ Industrial temperature range
The CAT5241 is four Digitally Programmable
Potentiometers (DPPs™) integrated with control logic
and 16 bytes of NVRAM memory. Each DPP consists
of a series of 63 resistive elements connected
between two externally accessible end points. The tap
points between each resistive element are connected
to the wiper outputs with CMOS switches. A separate
6-bit control register (WCR) independently controls
the wiper tap switches for each DPP. Associated with
each wiper control register are four 6-bit non-volatile
memory data registers (DR) used for storing up to four
wiper settings. Writing to the wiper control register or
any of the non-volatile data registers is via a I²C serial
bus. On power-up, the contents of the first data
register (DR0) for each of the four potentiometers is
automatically loaded into its respective wiper control
register (WCR).
The CAT5241 can be used as a potentiometer or as a
two terminal, variable resistor. It is intended for circuit
level or system level adjustments in a wide variety of
applications.
For Ordering Information details, see page 15.
FUNCTIONAL DIAGRAM
PIN CONFIGURATION
SOIC 20 Lead (W)
TSSOP 20 Lead (Y)
RW0
1
20
VCC
RL0
2
19
RW3
RH0
3
18
RL3
A0
4
17
RH3
A2
A1
RW1
5 CAT 16
6 5241 15
RL1
7
14
SCL
A3
RH1
8
13
RW2
SDA
9
12
RL2
GND
10
11
RH2
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
RH0
SCL
SDA
I2C BUS
INTERFACE
RH1
RH2
RH3
WIPER
CONTROL
REGISTERS
RW0
RW1
RW2
A0
A1
A2
A3
CONTROL
LOGIC
NONVOLATILE
DATA
REGISTERS
RW3
RL0
1
RL1
RL2
RL3
Doc. No. MD-2011 Rev. Q
CAT5241
PIN DESCRIPTION
Pin (SOIC)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
RW0
RL0
RH0
A0
A2
RW1
RL1
RH1
SDA
GND
RH2
RL2
RW2
SCL
A3
A1
RH3
RL3
RW3
VCC
Function
Wiper Terminal for Potentiometer 0
Low Reference Terminal for Potentiometer 0
High Reference Terminal for Potentiometer 0
Device Address, LSB
Device Address
Wiper Terminal for Potentiometer 1
Low Reference Terminal for Potentiometer 1
High Reference Terminal for Potentiometer 1
Serial Data Input/Output
Ground
High Reference Terminal for Potentiometer 2
Low Reference Terminal for Potentiometer 2
Wiper Terminal for Potentiometer 2
Bus Serial Clock
Device Address
Device Address
High Reference Terminal for Potentiometer 3
Low Reference Terminal for Potentiometer 3
Wiper Terminal for Potentiometer 3
Supply Voltage
PIN DESCRIPTION
DEVICE OPERATION
SCL: Serial Clock
The CAT5241 serial clock input pin is used to clock
all data transfers into or out of the device.
The CAT5241 is four resistor arrays integrated with I²C
serial interface logic, four 6-bit wiper control registers
and sixteen 6-bit, non-volatile memory data registers.
Each resistor array contains 63 separate resistive
elements connected in series. The physical ends of
each array are equivalent to the fixed terminals of a
mechanical potentiometer (RH and RL). RH and RL are
symmetrical and may be interchanged. The tap
positions between and at the ends of the series resis–
tors are connected to the output wiper terminals (RW) by
a CMOS transistor switch. Only one tap point for each
potentiometer is connected to its wiper terminal at a
time and is determined by the value of the wiper control
register. Data can be read or written to the wiper control
registers or the non-volatile memory data registers via
the I²C bus. Additional instructions allow data to be
transferred between the wiper control registers and
each respective potentiometer's non-volatile data
registers. Also, the device can be instructed to operate
in an "increment/decrement" mode.
SDA: Serial Data
The CAT5241 bidirectional serial data pin is used to
transfer data into and out of the device. The SDA pin
is an open drain output and can be wire-or'd with the
other open drain or open collector outputs.
A0, A1, A2, A3: Device Address Inputs
These inputs set the device address when
addressing multiple devices. A total of sixteen
devices can be addressed on a single bus. A match
in the slave address must be made with the address
input in order to initiate communication with the
CAT5241.
RH, RL: Resistor End Points
The four sets of RH and RL pins are equivalent to the
terminal connections on a mechanical potentiometer.
RW: Wiper
The four RW pins are equivalent to the wiper terminal
of a mechanical potentiometer.
Doc. No. MD-2011 Rev. Q
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© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5241
ABSOLUTE MAXIMUM RATINGS(1)
Parameter
Temperature Under Bias
Storage Temperature
Voltage on any Pin with Respect to VSS(2)(3)
VCC with Respect to Ground
Package Power Dissipation Capability (TA = 25°C)
Lead Soldering Temperature (10s)
Wiper Current
Ratings
-55 to +125
-65 to +150
Units
°C
°C
-2.0 to +VCC +2.0
V
-2.0 to +7.0
1.0
300
±12
V
W
°C
mA
Ratings
-40 to +85
Units
°C
Recommended Operating Conditions
Vcc = +2.5V to +6V
Parameter
Operating Ambient Temperature (Industrial)
POTENTIOMETER CHARACTERISTICS
Over recommended operating conditions unless otherwise stated.
Symbol Parameter
RPOT
RPOT
RPOT
RPOT
IW
RW
RW
VTERM
VN
TCRPOT
TCRATIO
CH/CL/CW
fc
Potentiometer Resistance (-00)
Potentiometer Resistance (-50)
Potentiometer Resistance (-10)
Potentiometer Resistance (-25)
Potentiometer Resistance Tolerance
RPOT Matching
Power Rating
Wiper Current
Wiper Resistance
Wiper Resistance
Voltage on any RH or RL Pin
Noise
Resolution
Absolute Linearity (5)
Relative Linearity (6)
Temperature Coefficient of RPOT
Ratiometric Temp. Coefficient
Potentiometer Capacitances
Frequency Response
Test Conditions
Min
Typ
Max
100
50
10
2.5
25°C, each pot
IW = ±3mA @ VCC =3V
IW = ±3mA @ VCC = 5V
VSS = 0V
(4)
RW(n)(actual) - R(n)(expected)(8)
RW(n+1) - [RW(n)+LSB](8)
(4)
(4)
(4)
RPOT = 50kΩ (4)
80
GND
±20
1
50
±6
300
150
VCC
TBD
1.6
±1
±0.2
±300
20
10/10/25
0.4
Units
kΩ
kΩ
kΩ
kΩ
%
%
mW
mA
Ω
Ω
nV/√Hz
%
LSB(7)
LSB(7)
ppm/°C
ppm/°C
pF
MHz
Notes:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
(2) The minimum DC input voltage is –0.5V. During transitions, inputs may undershoot to –2.0V for periods of less than 20ns. Maximum DC
voltage on output pins is VCC +0.5V, which may overshoot to VCC +2.0V for periods of less than 20ns.
(3) Latch-up protection is provided for stresses up to 100mA on address and data pins from –1V to VCC + 1V.
(4) This parameter is tested initially and after a design or process change that affects the parameter.
(5) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
(6) 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.
(7) LSB = RTOT / 63 or (RH - RL) / 63, single pot
(8) n = 0, 1, 2, ..., 63
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
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Doc. No. MD-2011 Rev. Q
CAT5241
D.C. OPERATING CHARACTERISTICS
Over recommended operating conditions unless otherwise stated.
Symbol Parameter
Test Conditions
Min
Typ
Max
Units
fSCL = 400kHz
1
mA
VIN = GND or VCC;
SDA = GND; RWX = GND (2)
1
µA
VIN = GND to VCC
10
µA
VOUT = GND to VCC
10
µA
ICC
Power Supply Current
ISB
Standby Current (VCC = 5.0V)
ILI
Input Leakage Current
ILO
Output Leakage Current
VIL
Input Low Voltage
-1
VCC x 0.3
V
VIH
Input High Voltage
VCC x 0.7
VCC + 1.0
V
VOL1
Output Low Voltage (VCC = 3.0V)
0.4
V
Max
Units
IOL = 3 mA
CAPACITANCE
TA = 25°C, f = 1.0MHz, VCC = 5V
Symbol
Parameter
CI/O(1)
CIN(1)
Test Conditions
Min
Typ
Input/Output Capacitance (SDA)
VI/O = 0V
8
pF
Input Capacitance (A0, A1, A2, A3, SCL)
VIN = 0V
6
pF
A.C. CHARACTERISTICS
Over recommended operating conditions unless otherwise stated.
Symbol
fSCL
(1)
TI
tAA
tBUF
(1)
Parameter
Min
Typ
Max
Units
Clock Frequency
400
kHz
Noise Suppression Time Constant at SCL, SDA Inputs
50
ns
SLC Low to SDA Data Out and ACK Out
0.9
µs
Time the Bus Must Be Free Before a New Transmission Can Start
1.2
µs
Start Condition Hold Time
0.6
µs
tLOW
Clock Low Period
1.2
µs
tHIGH
Clock High Period
0.6
µs
tSU:STA
Start Condition Setup Time (For a Repeated Start Condition)
0.6
µs
tHD:DAT
Data in Hold Time
0
ns
tSU:DAT
Data in Setup Time
100
ns
tHD:STA
(1)
SDA and SCL Rise Time
0.3
µs
(1)
SDA and SCL Fall Time
300
ns
tR
tF
tSU:STO
tDH
Stop Condition Setup Time
0.6
µs
Data Out Hold Time
50
ns
POWER UP TIMING (1)
Over recommended operating conditions unless otherwise stated.
Symbol
Parameter
tPUR
tPUW
Min
Typ
Max
Units
Power-up to Read Operation
1
ms
Power-up to Write Operation
1
ms
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) All four wiper terminals RW0, RW1, RW2, and RW3 are tied to ground.
Doc. No. MD-2011 Rev. Q
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© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5241
WRITE CYCLE LIMITS
Over recommended operating conditions unless otherwise stated.
Symbol
Parameter
tWR
Min
Typ
Max
Units
5
ms
Write Cycle Time
The write cycle is the time from a valid stop condition of a write sequence to the end of the internal program/erase
cycle. During the write cycle, the bus interface circuits are disabled, SDA is allowed to remain high, and the
device does not respond to its slave address.
RELIABILITY CHARACTERISTICS
Over recommended operating conditions unless otherwise stated.
Symbol
NEND
(1)
TDR(1)
VZAP(1)
ILTH(1)(2)
Parameter
Reference Test Method
Min
Typ
Max
Units
Endurance
MIL-STD-883, Test Method 1033
1,000,000
Cycles/Byte
Data Retention
MIL-STD-883, Test Method 1008
100
Years
ESD Susceptibility
MIL-STD-883, Test Method 3015
2000
Volts
Latch-Up
JEDEC Standard 17
100
mA
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) tPUR and tPUW are the delays required from the time VCC is stable until the specified operation can be initiated.
Figure 1. Bus Timing
tF
tHIGH
tLOW
tR
tLOW
SCL
tSU:STA
tHD:STA
tHD:DAT
tSU:DAT
tSU:STO
SDA IN
tAA
tBUF
tDH
SDA OUT
Figure 2. Write Cycle Timing
SCL
8TH BIT
BYTE n
SDA
ACK
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
Figure 3. Start/Stop Timing
SDA
SCL
START BIT
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
STOP BIT
5
Doc. No. MD-2011 Rev. Q
CAT5241
of the particular slave device it is requesting. The four
most significant bits of the 8-bit slave address are
fixed as 0101 for the CAT5241 (see Figure 5). The
next four significant bits (A3, A2, A1, A0) are the
device address bits and define which device the
Master is accessing. Up to sixteen devices may be
individually addressed by the system. Typically, +5V
and ground are hard-wired to these pins to establish
the device's address.
SERIAL BUS PROTOCOL
The following defines the features of the I²C bus
protocol:
(1) Data transfer may be initiated only when the bus
is not busy.
(2) During a data transfer, the data line must remain
stable whenever the clock line is high. Any
changes in the data line while the clock is high will
be interpreted as a START or STOP condition.
After the Master sends a START condition and the
slave address byte, the CAT5241 monitors the bus
and responds with an acknowledge (on the SDA line)
when its address matches the transmitted slave
address.
The device controlling the transfer is a master,
typically a processor or controller, 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
CAT5241 will be considered a slave device in all
applications.
Acknowledge
After a successful data transfer, each receiving device
is required to generate an acknowledge. The
Acknowledging device pulls down the SDA line during
the ninth clock cycle, signaling that it received the 8
bits of data.
START Condition
The START Condition precedes all commands to the
device, and is defined as a HIGH to LOW transition of
SDA when SCL is HIGH. The CAT5241 monitors the
SDA and SCL lines and will not respond until this
condition is met.
The CAT5241 responds with an acknowledge after
receiving a START condition and its slave address. If
the device has been selected along with a write
operation, it responds with an acknowledge after
receiving each 8-bit byte.
STOP Condition
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must
end with a STOP condition.
When the CAT5241 is in a READ mode it transmits 8
bits of data, releases the SDA line, and monitors the
line for an acknowledge. Once it receives this
acknowledge, the CAT5241 will continue to transmit
data. If no acknowledge is sent by the Master, the
device terminates data transmission and waits for a
STOP condition.
DEVICE ADDRESSING
The bus Master begins a transmission by sending a
START condition. The Master then sends the address
Figure 4. Acknowledge Timing
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
ACKNOWLEDGE
START
Doc. No. MD-2011 Rev. Q
6
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5241
Acknowledge Polling
The disabling of the inputs can be used to take
advantage of the typical write cycle time. Once the
stop condition is issued to indicate the end of the
host's write operation, the CAT5241 initiates the
internal write cycle. ACK polling can be initiated
immediately. This involves issuing the start condition
followed by the slave address. If the CAT5241 is still
busy with the write operation, no ACK will be returned.
If the CAT5241 has completed the write operation, an
ACK will be returned and the host can then proceed
with the next instruction operation.
WRITE OPERATION
In the Write mode, the Master device sends the
START condition and the slave address information to
the Slave device. After the Slave generates an
acknowledge, the Master sends the instruction byte
that defines the requested operation of CAT5241. The
instruction byte consist of a four-bit opcode followed
by two register selection bits and two pot selection
bits. After receiving another acknowledge from the
Slave, the Master device transmits the data to be
written into the selected register. The CAT5241
acknowledges once more and the Master generates
the STOP condition, at which time if a non-volatile
data register is being selected, the device begins an
internal programming cycle to non-volatile memory.
While this internal cycle is in progress, the device will
not respond to any request from the Master device.
Figure 5. Slave Address Bits
CAT5241
*
0
1
0
1
A3
A2
A1
A0
A0, A1, A2 and A3 correspond to pin A0, A1, A2 and A3 of the device.
** A0, A1, A2 and A3 must compare to its corresponding hard wired input pins.
Figure 6. Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
INSTRUCTION
BYTE
SLAVE/DPP
ADDRESS
Fixed
Variable
op code
DR WCR DATA
P
S
A
C
K
A
C
K
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
Pot/WCR Data Register
Address
Address
S
T
O
P
7
A
C
K
Doc. No. MD-2011 Rev. Q
CAT5241
INSTRUCTIONS AND REGISTER
DESCRIPTION
INSTRUCTION BYTE
The next byte sent to the CAT5241 contains the
instruction and register pointer information. The four
most significant bits used provide the instruction
opcode I [3:0]. The P1 and P0 bits point to one of four
Wiper Control Registers. The least two significant bits,
R1 and R0, point to one of the four data registers of
each associated potentiometer. The format is shown
in Table 2.
SLAVE ADDRESS BYTE
The first byte sent to the CAT5241 from the
master/processor is called the Slave/DPP Address
Byte. The most significant four bits of the slave
address are a device type identifier. These bits for the
CAT5241 are fixed at 0101[B] (refer to Table 1).
The next four bits, A3 - A0, are the internal slave
address and must match the physical device address
which is defined by the state of the A3 - A0 input pins
for the CAT5241 to successfully continue the command sequence. Only the device which slave address
matches the incoming device address sent by the
master executes the instruction. The A3 - A0 inputs
can be actively driven by CMOS input signals or tied
to VCC or VSS.
Data Register Selection
Data Register Selected
R1
R0
DR0
0
0
DR1
0
1
DR2
1
0
DR3
1
1
Table 1. Identification Byte Format
Device Type
Identifier
Slave Address
ID3
ID2
ID1
ID0
0
1
0
1
A3
A2
A1
A0
(MSB)
(LSB)
Table 2. Instruction Byte Format
Instruction
Opcode
I3
(MSB)
Doc. No. MD-2011 Rev. Q
I2
WCR/Pot Selection
I1
P1
I0
8
P0
Data Register
Selection
R1
R0
(LSB)
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5241
four Data Registers and the associated Wiper Control
Register. Any data changes in one of the Data Regis–
ters is a non-volatile operation and will take a
maximum of 5ms.
WIPER CONTROL AND DATA REGISTERS
Wiper Control Register (WCR)
The CAT5241 contains four 6-bit Wiper Control
Registers, one for each potentiometer. The Wiper
Control Register output is decoded to select one of 64
switches along its resistor array. The contents of the
WCR can be altered in four ways: it may be written by
the host via Write Wiper Control Register instruction; it
may be written by transferring the contents of one of
four associated Data Registers via the XFR Data
Register instruction, it can be modified one step at a
time by the Increment/decrement instruction (see
Instruction section for more details). Finally, it is
loaded with the content of its data register zero (DR0)
upon power-up.
If the application does not require storage of multiple
settings for the potentiometer, the Data Registers can
be used as standard memory locations for system
parameters or user preference data.
INSTRUCTIONS
Four of the nine instructions are three bytes in length.
These instructions are:
— Read Wiper Control Register – read the current
wiper position of the selected potentiometer in
the WCR
The Wiper Control Register is a volatile register that
loses its contents when the CAT5241 is powereddown. Although the register is automatically loaded
with the value in DR0 upon power-up, this may be
different from the value present at power-down.
— Write Wiper Control Register – change current
wiper position in the WCR of the selected
potentiometer
Data Registers (DR)
Each potentiometer has four 6-bit non-volatile Data
Registers. These can be read or written directly by the
host. Data can also be transferred between any of the
— Write Data Register – write a new value to the
selected Data Register
— Read Data Register – read the contents of the
selected Data Register
The basic sequence of the three byte instructions is
illustrated in Figure 8. These three-byte instructions
Table 3. Instruction Set
Instruction Set
I3
I2
I1
I0
WCR1
/ P1
WCR0
/ P0
R1
R0
1
0
0
1
1/0
1/0
0
0
1
0
1
0
1/0
1/0
0
0
Read Data Register
1
0
1
1
1/0
1/0
1/0
1/0
Write Data Register
1
1
0
0
1/0
1/0
1/0
1/0
XFR Data Register to
Wiper Control Register
1
1
0
1
1/0
1/0
1/0
1/0
XFR Wiper Control
Register to Data Register
1
1
1
0
1/0
1/0
1/0
1/0
Global XFR Data Registers
to Wiper Control Registers
0
0
0
1
0
0
1/0
1/0
Global XFR Wiper Control
Registers to Data Register
1
0
0
0
0
0
1/0
1/0
Increment/Decrement
Wiper Control Register
0
0
1
0
1/0
1/0
0
0
Instruction
Read Wiper Control
Register
Write Wiper Control
Register
Operations
Read the contents of the Wiper Control
Register pointed to by P1-P0
Write new value to the Wiper Control
Register pointed to by P1-P0
Read the contents of the Data Register
pointed to by P1-P0 and R1-R0
Write new value to the Data Register
pointed to by P1-P0 and R1-R0
Transfer the contents of the Data Register
pointed to by P1-P0 and R1-R0 to its
associated Wiper Control Register
Transfer the contents of the Wiper Control
Register pointed to by P1-P0 to the Data
Register pointed to by R1-R0
Transfer the contents of the Data Registers
pointed to by R1-R0 of all four pots to their
respective Wiper Control Registers
Transfer the contents of both Wiper Control
Registers to their respective data Registers
pointed to by R1-R0 of all four pots
Enable Increment/decrement of the
Control Latch pointed to by P1-P0
Note: 1/0 = data is one or zero
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
9
Doc. No. MD-2011 Rev. Q
CAT5241
exchange data between the WCR and one of the Data
Registers. The WCR controls the position of the wiper.
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 maximum of tWR to
complete. The transfer can occur between one of the
four potentiometers and one of its associated
registers; or the transfer can occur between all
potentiometers and one associated register.
— Global XFR Data Register to Wiper Control
Register
This transfers the contents of all specified Data
Registers to the associated Wiper Control
Registers.
Four instructions require a two-byte sequence to
complete, as illustrated in Figure 7. These instructions
transfer data between the host/processor and the
CAT5241; either between the host and one of the data
registers or directly between the host and the Wiper
Control Register. These instructions are:
INCREMENT/DECREMENT COMMAND
The final command is Increment/Decrement (Figure 5
and 9). The Increment/Decrement command is
different from the other commands. Once the
command is issued and the CAT5241 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 RH terminal. Similarly, for each SCL clock
pulse while SDA is LOW, the selected wiper will move
one resistor segment towards the RL terminal.
— Global XFR Wiper Counter Register to Data
Register
This transfers the contents of all Wiper Control
Registers to the specified associated Data
Registers.
— XFR Data Register to Wiper Control Register
This transfers the contents of one specified Data
Register to the associated Wiper Control Register.
— XFR Wiper Control Register to Data Register
This transfers the contents of the specified Wiper
Control Register to the specified associated Data
Register.
See Instructions format for more detail.
Figure 7. Two-Byte Instruction Sequence
SDA
0
1
0
1
S ID3 ID2 ID1 ID0 A3
T
A
R
Device ID
T
A2 A1 A0
Internal
Address
A
C
K
I3
I2
I1
Instruction
Opcode
I0 P1 P0 R1 R0
Pot/WCR Register
Address Address
A
C
K
S
T
O
P
Figure 8. Three-Byte Instruction Sequence
SDA
0
1
0
1
S ID3 ID2 ID1 ID0 A3
T
A
Device ID
R
T
A2
I2 I1 I0 P1 P0 R1 R0 A
A0 A I3
C
C
K
K
Internal
Instruction Pot/WCR Data
Address
Opcode
Address Register
Address
A1
D7 D6 D5 D4 D3 D2 D1 D0
WCR[7:0]
or
Data Register D[7:0]
A
C
K
S
T
O
P
Figure 9. Increment/Decrement Instruction Sequence
0
SDA
S
T
A
R
T
1
0
1
ID3 ID2 ID1 ID0
Doc. No. MD-2011 Rev. Q
Device ID
A3
A2 A1 A0
Internal
Address
A
C
K
I3
I2
I1
Instruction
Opcode
10
I0
P1 P0 R1 R0
Pot/WCR Data
Address Register
Address
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
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5241
Figure 10. Increment/Decrement Timing Limits
INC/DEC
Command
Issued
tWRID
SCL
SDA
Voltage Out
RW
INSTRUCTION FORMAT
Read Wiper Control Register (WCR)
S
T
A
R
T
DEVICE ADDRESSES
0 1 0 1 A3 A2 A1 A0
A
C
K
INSTRUCTION
1 0 0 1 P1 P0 0 0
A
C
K
DATA
S
T
O
P
DATA
S
T
O
P
A
7 6 5 4 3 2 1 0 C
K
Write Wiper Control Register (WCR)
S
T
A
R
T
DEVICE ADDRESSES
0 1 0 1 A3 A2 A1 A0
INSTRUCTION
A
C
K
1 0 1 0 P1 P0 0 0
A
C
K
1 0 1 1 P1 P0 R1 R0
A
C
K
A
7 6 5 4 3 2 1 0 C
K
Read Data Register (DR)
S
T
A
R
T
DEVICE ADDRESSES
0 1 0 1 A3 A2 A1 A0
INSTRUCTION
A
C
K
DATA
A S
7 6 5 4 3 2 1 0 C T
K O
P
Write Data Register (DR)
S
T
A
R
T
DEVICE ADDRESSES
0 1 0 1 A3 A2 A1 A0
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
A
C
K
INSTRUCTION
1 1 0 0 P1 P0 R1 R0
11
A
C
K
DATA
A S
7 6 5 4 3 2 1 0 C T
K O
P
Doc. No. MD-2011 Rev. Q
CAT5241
Global Transfer Data Register (DR) to Wiper Control Register (WCR)
S
T
A
R
T
DEVICE ADDRESSES
0 1 0 1 A3 A2 A1 A0
A
C
K
INSTRUCTION
A
0 0 0 1 0 0 R1 R0 C
K
S
T
O
P
Global Transfer Wiper Control Register (WCR) to Data Register (DR)
S
T
A
R
T
DEVICE ADDRESSES
0 1 0 1 A3 A2 A1 A0
A
C
K
INSTRUCTION
A
1 0 0 0 0 0 R1 R0 C
K
S
T
O
P
Transfer Wiper Control Register (WCR) to Data Register (DR)
S
T
A
R
T
DEVICE ADDRESSES
A
0 1 0 1 A3 A2 A1 A0 C
K
INSTRUCTION
A S
1 1 1 0 P1 P0 R1 R0 C T
K O
P
Transfer Data Register (DR) to Wiper Control Register (WCR)
S
T
A
R
T
DEVICE ADDRESSES
A
0 1 0 1 A3 A2 A1 A0 C
K
INSTRUCTION
A S
1 1 0 1 P1 P0 R1 R0 C T
K O
P
Increment (I)/Decrement (D) Wiper Control Register (WCR)
S
T
A
R
T
DEVICE ADDRESSES
A
0 1 0 1 A3 A2 A1 A0 C
K
INSTRUCTION
0 0 1 0 P1 P0 0 0
A
C I/D I/D
K
DATA
...
S
I/D I/D T
O
P
Notes:
(1) Any write or transfer to the Non-volatile Data Registers is followed by a high voltage cycle after a STOP has been issued.
Doc. No. MD-2011 Rev. Q
12
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5241
PACKAGE OUTLINE DRAWINGS
SOIC 20-Lead 300 mils (W) (1)(2)
SYMBOL
E1
E
MIN
NOM
MAX
2.49
2.64
A
2.36
A1
0.10
A2
2.05
b
0.31
0.41
0.51
c
0.20
0.27
0.33
e
PIN#1 IDENTIFICATION
2.55
D
12.60
12.80
13.00
E
10.01
10.30
10.64
E1
7.40
7.50
7.60
e
b
0.30
1.27 BSC
h
0.25
L
0.40
0.75
θ
0°
8°
θ1
5°
15°
0.81
1.27
TOP VIEW
D
h
θ1
θ
A2
A
h
θ1
L
A1
SIDE VIEW
c
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters. Angles in degree.
(2) Complies with JEDEC standard MS-013.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
13
Doc. No. MD-2011 Rev. Q
CAT5241
TSSOP 20-Lead 4.4mm (Y) (1)(2)
b
SYMBOL
MIN
NOM
A
A1
E1
E
MAX
1.20
0.05
0.15
A2
0.80
1.05
b
0.19
0.30
c
0.09
D
6.40
6.50
6.60
E
6.30
6.40
6.50
E1
4.30
4.40
4.50
e
L
0.65 BSC
0.45
L1
θ1
0.20
0.60
0.75
1.00 REF
0°
8°
e
TOP VIEW
D
c
A2
A
θ1
L
A1
L1
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters. Angles in degree.
(2) Complies with JEDEC standard M0-153.
Doc. No. MD-2011 Rev. Q
14
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5241
EXAMPLE OF ORDERING INFORMATION (1)
Prefix
Device #
CAT
5241
Company ID
Suffix
W
Package
W: SOIC
Y: TSSOP
I
Temperature Range
I = Industrial (-40ºC to 85ºC)
-10
Resistance
-25: 2.5kΩ
-10: 10kΩ
-50: 50kΩ
-00: 100kΩ
- T1
Tape & Reel
T: Tape & Reel
1: 1,000/Reel – SOIC
2: 2,000/Reel – TSSOP
Product Number
5241
ORDERING PART NUMBER
Part Number
Resistance
CAT5241WI-25
2.5kΩ
CAT5241WI-10
10kΩ
CAT5241WI-50
50kΩ
CAT5241WI-00
100kΩ
CAT5241YI-25
2.5kΩ
CAT5241YI-10
10kΩ
CAT5241YI-50
50kΩ
CAT5241YI-00
100kΩ
Package
SOIC
TSSOP
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is Matte-Tin.
(3) This device used in the above example is a CAT5241WI-10-T1 (SOIC, Industrial Temperature, 10kΩ, Tape & Reel, 1,000/Reel).
(4) For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
15
Doc. No. MD-2011 Rev. Q
CAT5241
REVISION HISTORY
Date
30-Sep-03
Revision
G
Description
Deleted WP from Functional Diagram, pg. 1
03-Mar-04
H
Added TSSOP package in all areas
29-Mar-04
I
Eliminated data sheet designation
Eliminated Commercial temperature range in all areas
Updated Absolute Max Ratings and Potentiometer Characteristics notes
05-Apr-04
J
Corrected Potentiometer Resistance [Changed (-2.5) to (-25)] in table
22-Apr-06
K
Updated Example of Ordering Information
24-May-07
L
Updated 20-Lead TSSOP Package Drawing
Updated Example of Ordering Information
Update Copyrights, Trademarks and Patents
Added MD- in front of Document No.
20-Jun-07
M
Update Pin Description
Update D.C Operating Characteristics: Standby Current Test Conditions
02-Apr-08
N
Update Package Outline Drawings
08-Apr-08
O
Change 2-wire with I²C
Update Example of Ordering Information
Update Ordering Part Number table
25-Aug-08
P
Update Figures 7, 8 and 9
01-Dec-08
Q
Change logo and fine print to ON Semiconductor
ON Semiconductor and
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Doc. No. MD-2011 Rev. Q
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16
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Characteristics subject to change without notice
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