ONSEMI CAT5261WI-50

CAT5261
Dual Digitally Programmable Potentiometers
(DPP™) with 256 Taps and SPI Interface
FEATURES
DESCRIPTION
„ Two linear-taper digitally programmable
potentiometers
The CAT5261 is two Digitally Programmable
Potentiometers (DPPs™) integrated with control logic
and 8 bytes of NVRAM memory. Each DPP consists of
a series of 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 8-bit
control register (WCR) independently controls the wiper
tap switches for each DPP. Associated with each wiper
control register are four 8-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 nonvolatile data registers is via a SPI serial bus. On powerup, the contents of the first data register (DR0) for each
of the potentiometers is automatically loaded into its
respective wiper control register.
„ 256 resistor taps per potentiometer
„ End to end resistance 50kΩ or 100kΩ
„ Potentiometer control and memory access via
SPI interface
„ Low wiper resistance, typically 100
„ 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
The CAT5261 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. It is available in the -40°C to 85°C
industrial operating temperature range and offered in
a 24-lead SOIC and TSSOP package.
„ 24-lead SOIC and 24-lead TSSOP
„ Industrial temperature range
„ Industrial temperature range
For Ordering Information details, see page 14.
FUNCTIONAL DIAGRAM
PIN CONFIGURATION
SOIC/TSSOP (W, Y)
SO
1
¯¯¯¯¯
24 HOLD
A0
2
23 SCK
NC
3
22 NC
NC
4
21 NC
NC
5
20 NC
NC
6
VCC
7
RL0
8
17 RW1
RH0
9
16 RH1
RW0 10
15 RL1
¯¯¯
CS 11
14 A1
¯¯¯
WP 12
13 SI
RH0
CS
SCK
SI
SO
WIPER
CONTROL
REGISTERS
RW0
RW1
CAT
19 NC
5261
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
SPI BUS
INTERFACE
RH1
WP
A0
A1
HOLD
18 GND
CONTROL
LOGIC
NONVOLATILE
DATA
REGISTERS
RL0
1
RL1
Doc. No. MD-2122 Rev. F
CAT5261
PIN DESCRIPTIONS
SI: Serial Input
SI is the serial data input pin. This pin is used
to input all opcodes, byte addresses and data
to be written to the CAT5261. Input data is
latched on the rising edge of the serial clock.
Pin #
Name
1
SO
Serial Data Output
2
A0
Device Address, LSB
3
NC
No Connect
SO: Serial Output
SO is the serial data output pin. This pin is
used to transfer data out of the CAT5261.
During a read cycle, data is shifted out on the
falling edge of the serial clock.
4
NC
No Connect
5
NC
No Connect
6
NC
No Connect
7
VCC
Supply Voltage
8
RL0
Low Reference Terminal for Potentiometer 0
9
RH0
High Reference Terminal for Potentiometer 0
10
RW0
Wiper Terminal for Potentiometer 0
11
Chip Select
12
¯¯¯
CS
¯¯¯
WP
A0, A1: Device Address Inputs
These inputs set the device address when
addressing multiple devices. A total of four
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 CAT5261.
13
SI
Serial Input
14
A1
Device Address
15
RL1
Low Reference Terminal for Potentiometer 1
16
RH1
High Reference Terminal for Potentiometer 1
17
RW1
Wiper Terminal for Potentiometer 1
RH, RL: Resistor End Points
The RH and RL pins are equivalent to the
terminal connections on a mechanical
potentiometer.
18
GND
Ground
19
NC
No Connect
20
NC
No Connect
RW: Wiper
The RW pins are equivalent to the wiper
terminal of a mechanical potentiometer.
21
NC
No Connect
22
NC
No Connect
SCK: Serial Clock
SCK is the serial clock pin. This pin is used to
synchronize the communication between the
microcontroller and the CAT5261. Opcodes,
byte addresses or data present on the SI pin
are latched on the rising edge of the SCK.
Data on the SO pin is updated on the falling
edge of the SCK.
Function
Write Protection
23
SCK
Bus Serial Clock
¯¯¯
CS : Chip Select
¯¯¯¯¯
24
HOLD Hold
¯¯¯
CS is the Chip select pin. ¯¯¯
CS low enables
the CAT5261 and ¯¯¯
CS high disables the
CAT5261. ¯¯¯
CS high takes the SO output pin to high impedance and forces the devices into a Standby mode
(unless an internal write operation is underway). The CAT5261 draws ZERO current in the Standby mode. A high
to low transition on ¯¯¯
CS is required prior to any sequence being initiated. A low to high transition on ¯¯¯
CS after a
valid write sequence is what initiates an internal write cycle.
¯¯¯
WP: Write Protect
¯¯¯
WP is the Write Protect pin. The Write Protect pin will allow normal read/write operations when held high. When
¯¯¯
WP is tied low, all non-volatile write operations to the Data registers are inhibited (change of wiper control register
is allowed). ¯¯¯
WP going low while ¯¯¯
CS is still low will interrupt a write to the registers. If the internal write cycle has
already been initiated, ¯¯¯
WP going low will have no effect on any write operation.
¯¯¯¯¯ : Hold
HOLD
¯¯¯¯¯ pin is used to pause transmission to the CAT5261 while in the middle of a serial sequence without
The HOLD
¯¯¯¯¯ must be brought low while SCK is low. The
having to retransmit entire sequence at a later time. To pause, HOLD
SO pin is in a high impedance state during the time the part is paused, and transitions on the SI pins will be
¯¯¯¯¯ is brought high, while SCK is low. (HOLD
¯¯¯¯¯ should be held high any
ignored. To resume communication, HOLD
¯¯¯¯¯ may be tied high directly to VCC or tied to VCC through a resistor.
time this function is not being used.) HOLD
¯¯¯
WP: Write Protect Input
The ¯¯¯
WP pin when tied low prevents non-volatile writes to the device (change of wiper control register is allowed)
and when tied high or left floating normal read/write operations are allowed. See Write Protection on page 6 for
more details.
Doc. No. MD-2122 Rev. F
2
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5261
SERIAL BUS PROTOCOL
The CAT5261 supports the SPI bus data transmission
protocol. The synchronous Serial Peripheral Interface
(SPI) helps the CAT5261 to interface directly with
many of today's popular microcontrollers. The
CAT5261 contains an 8-bit instruction register .The
instruction set and the operation codes are detailed in
the instruction set table 3 on page 9.
DEVICE OPERATION
The CAT5261 is two resistor arrays integrated with an
SPI serial interface logic, two 8-bit wiper control
registers and eight 8-bit, non-volatile memory data
registers. Each resistor array contains 255 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 resistors are connected to the output wiper
terminals (RW) by a After the device is selected with
¯¯¯
CS going low the first byte will be received. The part
is accessed via the SI pin, with data being clocked in
on the rising edge of SCK. The first byte contains one
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
of the six op-codes that define the operation to be
performed.
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 SPI bus. Additional instructions
allows 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.
3
Doc. No. MD-2122 Rev. F
CAT5261
ABSOLUTE MAXIMUM RATINGS(1)
Parameters
Temperature Under Bias
Storage Temperature
Voltage on Any Pin with Respect to Ground (1) (2)
VCC with Respect to Ground
Package Power Dissipation Capability (TA = 25ºC)
Lead Soldering Temperature (10s)
Wiper Current
Ratings
-55 to +125
-65 to +150
-2.0 to +VCC + 2.0
-0.2 to +7.0
1.0
300
±6
Units
ºC
°C
V
V
W
ºC
mA
Ratings
+2.5 to +6.0
-40 to +85
Units
V
°C
RECOMMENDED OPERATING CONDITIONS
Parameters
VCC
Industrial Temperature
POTENTIOMETER CHARACTERISTICS
(Over recommended operating conditions unless otherwise stated.)
Symbol
RPOT
RPOT
IW
RW
RW
VTERM
VN
TCRPOT
TCRATIO
CH/CL/CW
fc
Parameter
Potentiometer Resistance (-00)
Potentiometer Resistance (-50)
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
Limits
Typ.
100
50
25°C, each pot
IW = ±3mA @ VCC = 3V
IW = ±3mA @ VCC = 5V
200
100
0
Max
kΩ
kΩ
±20
%
1
50
±3
300
150
VCC
%
mW
mA
Ω
Ω
V
(4)
0.4
Rw(n)(actual)-R(n)(expected)(8)
Rw(n+1)-[Rw(n)+LSB](8)
(4)
(4)
(4)
RPOT = 50kΩ (4)
±1
±0.2
±300
20
10/10/25
0.4
Units
nV√Hz
%
LSB (7)
LSB (7)
ppm/ºC
ppm/ºC
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 / 255 or (RH - RL) / 255, single pot
(8) n = 0, 1, 2, ..., 255
Doc. No. MD-2122 Rev. F
4
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5261
D.C. OPERATING CHARACTERISTICS
VCC = +2.5V to +6.0V, unless otherwise specified.
Symbol
Max
Units
fSCL = 400kHz, SDA = Open
VCC = 6V, Inputs = GNDs
1
mA
Power Supply Current
fSCK = 400kHz, SDA Open
5
mA
Non-volatile WRITE
VCC = 6V, Input = GND
ISB
Standby Current (VCC = 5.0V)
VIN = GND or VCC, SDA = Open
1
µA
ILI
Input Leakage Current
VIN = GND to VCC
10
µA
ILO
Output Leakage Current
VOUT = GND to VCC
10
µA
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)
IOL = 3mA
0.4
V
VOH1
Output High Voltage
IOH = -1.6mA
ICC1
ICC2
Parameter
Test Conditions
Power Supply Current
Min
VCC – 0.8
V
(1)
PIN CAPACITANCE
TA = 25ºC, f = 1.0MHz, VCC = 5V, unless otherwise specified.
Symbol
COUT
CIN
(1)
(1)
Test
Conditions
Max
Units
Output Capacitance (SO)
VOUT = 0V
8
pF
¯¯¯¯¯, A0, A1)
Input Capacitance (¯¯¯
CS , SCK, SI, ¯¯¯
WP,HOLD
VIN = 0V
6
pF
Max
Units
A.C. CHARACTERISTICS
Symbol
Parameter
Test Conditions
Min
tSU
Data Setup Time
50
ns
tH
Data Hold Time
50
ns
tWH
SCK High Time
125
ns
tWL
SCK Low Time
125
ns
fSCK
Clock Frequency
DC
tLZ
3
MHz
¯¯¯¯¯ to Output Low Z
HOLD
50
ns
tRI(1)
tFI(1)
Input Rise Time
2
µs
Input Fall Time
2
µs
tHD
tCD
¯¯¯¯¯ Setup Time
HOLD
¯¯¯¯¯ Hold Time
HOLD
tV
Output Valid from Clock Low
tHO
Output Hold Time
tDIS
Output Disable Time
tHZ
¯¯¯¯¯ to Output High Z
HOLD
¯¯¯
CS High Time
tCS
tCSS
tCSH
CL = 50pF
100
ns
100
ns
200
0
ns
250
100
¯¯¯
CS Setup Time
¯¯¯
CS Hold Time
ns
ns
ns
2
ns
250
ns
250
ns
Note:
(1)
This parameter is tested initially and after a design or process change that affects the parameter.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-2122 Rev. F
CAT5261
POWER UP TIMING (1)(2)
Symbol
Parameter
Max
Units
tPUR
Power-up to Read Operation
1
ms
tPUW
Power-up to Write Operation
1
ms
Min
Max
Units
WIPER TIMING
Symbol
Parameter
tWRPO
Wiper Response Time After Power Supply Stable
5
10
µs
tWRL
Wiper Response Time After Instruction Issued
5
10
µs
Max
Units
5
ms
Max
Units
WRITE CYCLE LIMITS
Symbol
tWR
Parameter
Write Cycle Time
RELIABILITY CHARACTERISTICS
Symbol
NEND
(3)
TDR(3)
VZAP(3)
ILTH(3)
Parameter
Reference Test Method
Min
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
V
Latch-Up
JEDEC Standard 17
100
mA
Notes:
(1)
This parameter is tested initially and after a design or process change that affects the parameter.
(2)
tPUR and tPUW are delays required from the time VCC is stable until the specified operation can be initiated.
(3)
This parameter is tested initially and after a design or process change that affects the parameter.
Figure 1. Synchronous Data Timing
tCS
VIH
CS
VIL
tCSH
tCSS
SCK
VIH
tH
tSU
VIH
SI
tWL
tWH
VIL
VALID IN
VIL
tRI
tFI
tV
SO
VOH
HI-Z
tHO
tDIS
HI-Z
VOL
Note: Dashed Line = mode (1, 1)
Doc. No. MD-2122 Rev. F
6
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5261
¯¯¯¯¯ Timing
Figure 2. HOLD
CS
tCD
tCD
SCK
tHD
tHD
HOLD
tHZ
HIGH IMPEDANCE
SO
tLZ
by CMOS input signals or tied to VCC or VSS. The
remaining two bits in the device address byte must be
set to 0.
INSTRUCTION AND REGISTER
DESCRIPTION
DEVICE TYPE / ADDRESS BYTE
The first byte sent to the CAT5261 from the master/
processor is called the Device Address Byte. The
most significant four bits of the Device Type address
are a device type identifier. These bits for the
CAT5261 are fixed at 0101[B] (refer to Table 1).
INSTRUCTION BYTE
The next byte sent to the CAT5261 contains the
instruction and register pointer information. The four
most significant bits used provide the instruction
opcode I3 - I0. The R1 and R0 bits point to one of the
four data registers of each associated potentiometer.
The least two significant bits point to one of two Wiper
Control Registers. The format is shown in Table 2.
The two least significant bits in the slave address
byte, A1 - A0, are the internal slave address and must
match the physical device address which is defined by
the state of the A1 - A0 input pins for the CAT5261 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 A1 - A0 inputs can be actively driven
Data Register Selection
Data Register Selected
R1
R0
DR0
0
0
DR1
0
1
Table 1. Identification Byte Format
Device Type
Identifier
Slave Address
ID3
ID2
ID1
ID0
0
1
0
1
A3
A2
A1
(MSB)
A0
(LSB)
Table 2. Instruction Byte Format
Instruction
Opcode
I3
I2
Data Register
Selection
I1
I0
R1
(MSB)
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
R0
WCR/Pot Selection
P1
P0
(LSB)
7
Doc. No. MD-2122 Rev. F
CAT5261
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.
WIPER CONTROL AND DATA REGISTERS
Wiper Control Register (WCR)
The CAT5261 contains two 8-bit Wiper Control
Registers, one for each potentiometer. The Wiper
Control Register output is decoded to select one of
256 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.
Write in Process
The contents of the Data Registers are saved to
nonvolatile memory when the ¯¯¯
CS input goes HIGH
after a write sequence is received. The status of the
internal write cycle can be monitored by issuing a
Read Status command to read the Write in Process
(WIP) bit.
INSTRUCTIONS
Five of the ten 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
— Write Wiper Control Register – change current
wiper position in the WCR of the selected
potentiometer
— Read Data Register – read the contents of the
selected Data Register
— Write Data Register – write a new value to the
selected Data Register
The Wiper Control Register is a volatile register that
loses its contents when the CAT5261 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.
Data Registers (DR)
Each potentiometer has four 8-bit non-volatile 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 Control
Register. Any data changes in one of the Data
Registers is a non-volatile operation and will take a
maximum of 5ms.
— Read Status – Read the status of the WIP bit
which when set to "1" signifies a write cycle is in
progress.
Table 3. Instruction Set
Instruction
Read Wiper Control Register
Note: 1/0 = data is one or zero
Instruction Set
I3
I2
I1
1
0
0
I0
1
R1
0
R0
0
WCR1/ P1
1/0
WCR0/ P0
1/0
Write Wiper Control Register
1
0
1
0
0
0
1/0
1/0
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
1/0
1/0
0
0
Global XFR Wiper Control
Registers to Data Register
1
0
0
0
1/0
1/0
0
0
Increment/Decrement Wiper
Control Register
Read Status (WIP bit)
0
0
1
0
0
0
1/0
1/0
0
1
0
1
0
0
0
1
Doc. No. MD-2122 Rev. F
8
Operation
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 R1R0 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
Read WIP bit to check internal write
cycle status
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5261
The basic sequence of the three byte instructions is
illustrated in Figure 8. These three-byte instructions
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 minimum of tWR to
complete. The transfer can occur between one of the
potentiometers and one of its associated registers; or
the transfer can occur between both 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.
— Global XFR Wiper Counter Register to Data
Register
This transfers the contents of all Wiper Control
Registers to the specified associated Data
Registers.
INCREMENT/DECREMENT COMMAND
The final command is Increment/Decrement (Figure 9
and 10). The Increment/Decrement command is different from the other commands. Once the command is
issued 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 SCK
clock pulse (tHIGH) while SI is HIGH, the selected wiper
will move one resistor segment towards the RH
terminal. Similarly, for each SCK clock pulse while SI
is LOW, the selected wiper will move one resistor
segment towards the RL terminal.
Four instructions require a two-byte sequence to
complete, as illustrated in Figure 7. These instructions
transfer data between the host/processor and the
CAT5261; either between the host and one of the data
registers or directly between the host and the Wiper
Control Register. These instructions are:
— 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
SI
0
1
0
1
0
0
ID3 ID2 ID1 ID0 A3
A2 A1 A0 I3
Internal
Address
Device ID
I2
I1
R1 R0 P1 P0
I0
Instruction
Opcode
Register
Address
Pot/WCR
Address
Figure 8. Three-Byte Instruction Sequence
SI
0
1
0
1
0
0
A2
ID3 ID2 ID1 ID0 A3
A1
A0 I3
Internal
Address
Device ID
I2
I1 I0
R1 R0 P1 P0
Instruction
Opcode
D7 D6 D5 D4 D3 D2 D1 D0
Data
Pot/WCR
Register Address
Address
WCR[7:0]
or
Data Register D[7:0]
Figure 9. Increment/Decrement Instruction Sequence
SI
0
1
0
1
0
ID3 ID2 ID1 ID0
A3
Device ID
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
0
A2 A1 A0
Internal
Address
I3
I2
I1
I0
Instruction
Opcode
9
R1 R0 P1 P0
I
N
Pot/WCR C
Data
Register Address 1
Address
I
N
C
2
I
N
C
n
D
E
C
1
D
E
C
n
Doc. No. MD-2122 Rev. F
CAT5261
Figure 10. Increment/Decrement Timing Limits
INC/DEC
Command
Issued
tWRL
SCK
SI
Voltage Out
RW
INSTRUCTION FORMAT
Read Wiper Control Register (WCR)
DEVICE ADDRESSES
0 1 0 1
¯¯¯
CS
0
0
A
1
INSTRUCTION
A 1 0
0
0
1
0
0
DATA
P
1
P
0
7
6
5
4
3
2
1
0 ¯¯¯
CS
Write Wiper Control Register (WCR)
DEVICE ADDRESSES
0 1 0 1
¯¯¯
CS
0
0
A
1
INSTRUCTION
A
0
1
0
1
0
A
0
1 0 1 1 R
1
0
DATA
0
P
1
7
P
0
6
5
4
3
2
1
0 ¯¯¯
CS
Read Data Register (DR)
DEVICE ADDRESSES
0 1 0 1
¯¯¯
CS
0
0
A
1
INSTRUCTION
R
0
DATA
P
1
P 7 6 5 4 3 2 1 0 ¯¯¯
CS
0
Write Data Register (DR)
DEVICE ADDRESSES
INSTRUCTION
DATA
0 1 0 1 0 0 A A 1 1 0 0 R R P P 7 6 5 4 3 2 1 0 ¯¯¯ High Voltage
¯¯¯
CS
CS
Write Cycle
1 0
1 0 1 0
Read Status (WIP)
DEVICE ADDRESSES
0 1 0 1
¯¯¯
CS
Doc. No. MD-2122 Rev. F
0
0
A
1
A
0
INSTRUCTION
0
1
0
1
0
0
10
DATA
0
1
7
0
6
0
5
0
4
0
3
0
2
0
1 W ¯¯¯
CS
0 I
P
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5261
Global Transfer Data Register (DR) to Wiper Control Register (WCR)
DEVICE ADDRESSES
0 1 0 1
¯¯¯
CS
0
0
A
1
INSTRUCTION
A
0
0 0 0 1 R R
1 0
0
0 ¯¯¯
CS
Global Transfer Wiper Control Register (WCR) to Data Register (DR)
DEVICE ADDRESSES
0 1 0 1 0
¯¯¯
CS
INSTRUCTION
A A 1 0 0 0 R R 0
1 0
1 0
0
0 ¯¯¯ High Voltage
CS
Write Cycle
Transfer Wiper Control Register (WCR) to Data Register (DR)
DEVICE ADDRESSES
0 1 0 1 0
¯¯¯
CS
INSTRUCTION
A A 1 1 1 0 R R P P ¯¯¯ High Voltage
CS
Write Cycle
1 0
1 0 1 0
0
Transfer Data Register (DR) to Wiper Control Register (WCR)
DEVICE ADDRESSES
0 1 0 1
¯¯¯
CS
0
0
A
1
INSTRUCTION
A
0
1 1 0 1 R R P
1 0 1
P ¯¯¯
CS
0
Increment (I)/Decrement (D) Wiper Control Register (WCR)
DEVICE ADDRESSES
0 1 0 1
¯¯¯
CS
0
0
A
1
A
0
INSTRUCTION
0 0 1 0 0
0
DATA
P P I/D I/D
1 0
...
I/D I/D ¯¯¯
CS
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.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
11
Doc. No. MD-2122 Rev. F
CAT5261
PACKAGE OUTLINE DRAWINGS
SOIC 24-Lead 300mils (W)
E1
SYMBOL
MIN
E
e
PIN#1 IDENTIFICATION
MAX
A
2.35
2.65
A1
0.10
0.30
A2
2.05
2.55
b
0.31
0.51
c
0.20
0.33
D
15.20
15.40
E
10.11
10.51
E1
7.34
e
b
NOM
7.60
1.27 BSC
h
0.25
0.75
L
0.40
1.27
θ
0°
8°
θ1
5°
15°
TOP VIEW
h
D
A2
A
A1
SIDE VIEW
h
θ1
θ
θ1
L
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 in millimeters. Angles in degrees.
(2)
Complies with JEDEC specification MS-013.
Doc. No. MD-2122 Rev. F
12
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5261
TSSOP 24-Lead 4.4mm (Y)
b
SYMBOL
MIN
NOM
MAX
A
E1
E
1.20
A1
0.05
0.15
A2
0.80
1.05
b
0.19
0.30
c
0.09
D
7.70
7.80
7.90
E
6.25
6.40
6.55
E1
4.30
4.40
4.50
0.20
e
0.65 BSC
L
1.00 REF
L1
0.50
θ1
0°
0.60
0.70
8°
e
TOP VIEW
D
c
A2
A
θ1
L1
A1
L
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 in millimeters. Angles in degrees.
(2)
Complies with JEDEC specification MO-153.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
13
Doc. No. MD-2122 Rev. F
CAT5261
EXAMPLE OF ORDERING INFORMATION
Prefix
Device # Suffix
CAT
5261
Company ID
W
Package
W: SOIC
Y: TSSOP
I
Temperature Range
I = Industrial (-40ºC to 85ºC)
-00
- T1
Resistance
50: 50kΩ
00: 100kΩ
Tape & Reel
T: Tape & Reel
1: 1000/Reel - SOIC
2: 2000/Reel - TSSOP
Product Number
5261
Notes:
(1)
All packages are RoHS-compliant (Lead-free, Halogen-free).
(2)
The device used in the above example is a CAT526159WI-00-T1 (SOIC, Industrial Temperature, 100kΩ, Tape & Reel).
(3)
The lead finish is Matte-Tin.
Ordering Part Number
CAT5261WI-50
CAT5261WI-00
CAT5261YI-50
CAT5261YI-00
Doc. No. MD-2122 Rev. F
14
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5261
REVISION HISTORY
Date
Rev.
Description
18-Nov-03
A
Initial Issue
04-Apr-04
B
Updated wiper resistance from 50Ω to 100Ω
Updated Functional Diagram
Updated ¯¯¯
WP Pin Description
Updated notes in Absolute Max Ratings Eliminated Commercial temp range in all areas
Updated Potentiometer Characteristics table
Updated DC Characteristics table
Updated Pin Capacitance table
Updated AC Characteristics table
Added Wiper Timing Table on page 6
Corrected Synchronous Data Timing (Figure 1) drawing
21-Sep-04
C
Updated Figure 8 (Three Byte Instruction Sequence)
31-Jul-07
D
Updated Example of Ordering Information
Update Package Outline Drawings
Added MD- to document number
07-Feb-08
E
Update Instruction Format – Read Data Register (DR) and Write Data Register (DR)
24-Nov-08
F
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© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
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Doc. No. MD-2122 Rev. F