ON CAT5259WI-00-T1 Quad digitally programmable potentiometers (dppâ ¢) with 256 taps and iâ²c interface Datasheet

CAT5259
Quad Digitally Programmable Potentiometers
(DPP™) with 256 Taps and I²C Interface
FEATURES
DESCRIPTION
„ Four linear taper digitally programmable
potentiometers
The CAT5259 is four digitally programmable poten–
tiometers (DPPs™) integrated with control logic and
16 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 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 registers.
„ 256 resistor taps per potentiometer
„ End to end resistance 50 kΩ or 100 kΩ
„ Potentiometer control and memory access via
I²C interface
„ Low wiper resistance, typically 100 Ω
„ 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 1 µA
„ 1,000,000 nonvolatile WRITE cycles
„ 100 year nonvolatile memory data retention
The CAT5259 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 0ºC to 70ºC
commercial and -40ºC to 85ºC industrial operating
temperature ranges and offered in a 24-lead SOIC
and TSSOP package.
„ 24-lead SOIC and 24-lead TSSOP packages
„ Industrial temperature range
For Ordering Information details, see page 15.
FUNCTIONAL DIAGRAM
PIN CONFIGURATION
SOIC (W)
TSSOP (Y)
NC
1
24 A3
A0
2
23 SCL
RW3
3
22 RL2
RH3
4
21 RH2
RL3
5
20 RW2
NC
6
19 NC
VCC
7
18 GND
RLO
8
17 RW1
RHO
9
16 RH1
RWO 10
15 RL1
A2 11
14 A1
12
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
RH0
SCL
SDA
I²C BUS
INTERFACE
RH1
RH2
RH3
WIPER CONTROL
REGISTERS
RW0
RW1
WP
A0
A1
A2
A3
CONTROL LOGIC
NONVOLATILE
DATA
REGISTERS
RW2
RW3
RL0
RL1
RL2
RL3
13 SDA
1
Doc. No. MD-2000 Rev. J
CAT5259
PIN DESCRIPTIONS
Pin
#
1
Name
SCL: Serial Clock
The CAT5259 serial clock input pin is used to
clock all data transfers into or out of the device.
Function
NC
No Connect
2
A0
Device Address, LSB
3
RW3
Wiper Terminal for Potentiometer 3
4
RH3
High Reference Terminal for Potentiometer 3
5
RL3
Low Reference Terminal for Potentiometer 3
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
A2
Device Address
12
¯¯¯
WP
Write Protection
13
SDA
Serial Data Input/Output
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
18
GND
Ground
19
NC
No Connect
20
RW2
Wiper Terminal for Potentiometer 2
21
RH2
High Reference Terminal for Potentiometer 2
22
RL2
Low Reference Terminal for Potentiometer 2
23
SCL
Bus Serial Clock
24
A3
Device Address
SDA: Serial Data
The CAT5259 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-Ored with the other open drain or open
collector I/Os.
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 CAT5259.
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.
¯¯¯
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.
DEVICE OPERATION
The CAT5259 is four resistor arrays integrated with a I²C serial interface logic, four 8-bit wiper control registers
and sixteen 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). The tap positions between and at the ends of the series resistors 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.
Doc. No. MD-2000 Rev. J
2
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5259
ABSOLUTE MAXIMUM RATINGS(1)
Parameters
Temperature Under Bias
Storage Temperature
Voltage on Any Pin with Respect to VSS(1) (2)
VCC with Respect to Ground
Package Power Dissipation Capability (TA = 25ºC)
Lead Soldering Temperature (10 s)
Wiper Current
Ratings
-55 to +125
-65 to +150
-2.0 to +VCC + 2.0
-2.0 to +7.0
1.0
300
±6
Units
ºC
°C
V
V
W
ºC
mA
Ratings
+2.5 to +6
-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 (100 kΩ)
Potentiometer Resistance (50 kΩ)
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 = ±3 mA @ VCC = 3 V
IW = ±3 mA @ VCC = 5 V
VSS = 0 V
(4)
200
100
VSS
Max.
kΩ
kΩ
±20
%
1
50
+3
300
150
VCC
%
mW
mA
Ω
Ω
V
0.4
RW(n)(actual)-R(n)(expected)(8)
RW(n+1)-[RW(n)+LSB](8)
(4)
(4)
(4)
RPOT = 50 kΩ (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 –0.5 V. During transitions, inputs may undershoot to –2.0 V for periods of less than 20 ns. Maximum DC
voltage on output pins is VCC +0.5 V, which may overshoot to VCC +2.0 V for periods of less than 20 ns.
(3) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1 V to VCC +1 V.
(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
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-2000 Rev. J
CAT5259
D.C. OPERATING CHARACTERISTICS
VCC = +2.5V to +6.0V, unless otherwise specified.
Symbol
Parameter
Test Conditions
ICC1
Power Supply Current
ICC2
Min
Max
Units
fSCL = 400 kHz, SDA = Open
VCC = 6 V, Inputs = GND
1
mA
Power Supply Current
Non-volatile WRITE
fSCK = 400 kHz, SDA Open
VCC = 6 V, Input = GND
5
mA
ISB
Standby Current (VCC = 5 V)
VIN = GND or VCC, SDA = Open
5
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 V)
0.4
V
IOL = 3 mA
CAPACITANCE
TA = 25ºC, f = 1.0 MHz, VCC = 5 V
Symbol
Test
Conditions
(1)
Input/Output Capacitance (SDA)
(1)
Input Capacitance (A0, A1, A2, A3, SCL, ¯¯¯
WP)
CI/O
CIN
Max.
Units
VI/O = 0 V
8
pF
VIN = 0 V
6
pF
A.C. CHARACTERISTICS
2.5 V - 6.0 V
Symbol
fSCL
(1)
TI
tAA
tBUF
(1)
Parameter
Max.
Units
Clock Frequency
400
kHz
Noise Suppression Time Constant at SCL, SDA Inputs
200
ns
1
µs
Min.
SLC Low to SDA Data Out and ACK Out
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 SetupTime (for a Repeated Start Condition)
0.6
µs
tHD:DAT
Data in Hold Time
0
ns
tSU:DAT
Data in Setup Time
50
ns
tHD:STA
(1)
tR
(1)
tF
tSU:STO
tDH
SDA and SCL Rise Time
0.3
SDA and SCL Fall Time
300
µs
ns
Stop Condition Setup Time
0.6
µs
Data Out Hold Time
100
ns
Notes:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
Doc. No. MD-2000 Rev. J
4
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5259
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
WRITE CYCLE LIMITS
Symbol
tWR
(3)
Parameter
Write Cycle Time
RELIABILITY CHARACTERISTICS
Symbol
Parameter
Reference Test Method
(4)
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
NEND
TDR(4)
VZAP(4)
ILTH(4)
Min
Max
Units
Figure 1. Bus Timing
tF
tHIGH
tLOW
tR
tLOW
SCL
tSU:STA
tHD:STA
tHD:DAT
tSU:DAT
tSU:STO
SDA IN
tAA
tDH
tBUF
SDA OUT
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)
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.
(4)
This parameter is tested initially and after a design or process change that affects the parameter.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-2000 Rev. J
CAT5259
The following defines the features of the I²C bus
protocol:
The CAT5259 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.
(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.
When the CAT5259 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 CAT5259 will continue to transmit data. If no
acknowledge is sent by the Master, the device terminates
data transmission and waits for a STOP condition.
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
CAT5259 will be considered a slave device in all
applications.
WRITE OPERATIONS
SERIAL BUS PROTOCOL
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 CAT5259. 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 CAT5259
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.
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 CAT5259 monitors the
SDA and SCL lines and will not respond until this
condition is met.
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.
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 CAT5259 initiates the
internal write cycle. ACK polling can be initiated
immediately. This involves issuing the start condition
followed by the slave address. If the CAT5259 is still
busy with the write operation, no ACK will be returned.
If the CAT5259 has completed the write operation, an
ACK will be returned and the host can then proceed
with the next instruction operation.
DEVICE ADDRESSING
The bus Master begins a transmission by sending a
START condition. The Master then sends the address
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 CAT5259 (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.
Write Protection
The Write Protection feature allows the user to protect
against inadvertent programming of the non-volatile data
registers. If the ¯¯¯
WP pin is tied to LOW, the data registers
are protected and become read only. Similarly, the ¯¯¯
WP
pin is going low after start will interrupt non-volatile write
to data registers, while ¯¯¯
WP pin going low after an
internal write cycle has started will have no effect on any
write operation. The CAT5259 will accept both slave
addresses and instructions, but the data registers are
protected from programming by the device’s failure to
send an acknowledge after data is received.
After the Master sends a START condition and the
slave address byte, the CAT5259 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address.
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.
Doc. No. MD-2000 Rev. J
6
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5259
Figure 2. Write Cycle Timing
SCL
SDA
8TH BIT
ACK
BYTE n
tWR
START
CONDITION
STOP
CONDITION
ADDRESS
Figure 3. Start/Stop Condition
SDA
SCL
START CONDITION
STOP CONDITION
Figure 4. Acknowledge Condition
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
ACKNOWLEDGE
START
Figure 5. Slave Address Bits
CAT5259
*
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.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
7
Doc. No. MD-2000 Rev. J
CAT5259
INSTRUCTION BYTE
The next byte sent to the CAT5259 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 four Wiper
Control Registers. The format is shown in Table 2.
INSTRUCTION AND REGISTER
DESCRIPTION
SLAVE ADDRESS BYTE
The first byte sent to the CAT5259 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
CAT5259 are fixed at 0101[B] (refer to Table 1).
Data Register Selection
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 CAT5259 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 Selected
R1
R0
DR0
0
0
DR1
0
1
DR2
1
0
DR3
1
1
Figure 6. Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
INSTRUCTION
BYTE
SLAVE/DPP
ADDRESS
Fixed
Variable
op code
Register Pot1 WCR
Address Address
S
T
O
P
DR1 WCRDATA
S
P
A
C
K
A
C
K
A
C
K
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
I2
Data Register
Selection
I1
I0
R1
(MSB)
Doc. No. MD-2000 Rev. J
R0
WCR/Pot Selection
P1
P0
(LSB)
8
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5259
Register. Any data changes in one of the Data
Registers is a non-volatile operation and will take a
maximum of 10ms.
WIPER CONTROL AND DATA REGISTERS
Wiper Control Register (WCR)
The CAT5259 contains four 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.
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
— 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 CAT5259 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
The basic sequence of the three byte instructions is
illustrated in Figure 8. These three-byte instructions
Table 3. Instruction Set
Instruction Set
R1 R0 WCR1/P1 WCR0/P0
Instruction
Read Wiper Control
Register
Write Wiper Control
Register
I3
I2
I1
I0
1
0
0
1
0
0
1/0
1/0
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
1
1
1
0
1/0 1/0
1/0
1/0
0
0
0
1
1/0 1/0
0
0
1
0
0
0
1/0 1/0
0
0
0
0
1
0
1/0
1/0
XFR Wiper Control
Register to Data
Register
Gang XFR Data
Registers to Wiper
Control Registers
Gang XFR Wiper
Control Registers to
Data Register
Increment/Decrement
Wiper Control Register
0
0
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 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.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
9
Doc. No. MD-2000 Rev. J
CAT5259
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 tWR. 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 the transfer can occur between all
potentiometers and one associated register.
— Gang XFR Data Register to Wiper Control
Register
This transfers the contents of all specified Data
Registers to the associated Wiper Control
Registers.
— Gang 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 and the CAT5259 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.
Four instructions require a two-byte sequence to
complete, as illustrated in Figure 7. These instructions
transfer data between the host/processor and the
CAT5259; 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
DataRegister 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
A I3
C
K
Internal
Address
I2
I1
I0
Instruction
Opcode
R1 R0 P1 P0
Register
Address
A
C
K
Pot/WCR
Address
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
A0 A I3
C
K
Internal
Address
A1
I2
I1 I0
R1 R0 P1 P0 A
C
K
Data
Pot/WCR
Register Address
Address
Instruction
Opcode
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-2000 Rev. J
Device ID
A3
A2 A1 A0
Internal
Address
A
C
K
I3
I2
I1
Instruction
Opcode
10
I0
R1 R0 P1 P0
A
C
Pot/WCR K
Data
Register Address
Address
I
N
C
1
I
N
C
2
I
N
C
n
D
E
C
1
D
E
C
n
S
T
O
P
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5259
Figure 10. Increment/Decrement Timing Limits
INC/DEC
Command
Issued
tWRL
SCL
SDA
RW
Voltage Out
INSTRUCTION FORMAT
Read Wiper Control Register (WCR)
INSTRUCTION
DATA
S DEVICE ADDRESSES A
A
A S
T 0 1 0 1 A A A A C 1 0 0 1 0 0 P P C 7 6 5 4 3 2 1 0 C T
A
K O
3 2 1 0 K
1 0 K
R
P
T
Write Wiper Control Register (WCR)
S DEVICE ADDRESSES A
INSTRUCTION
DATA
A
A S
T 0 1 0 1 A A A A C 1 0 1 0 0 0 P P C 7 6 5 4 3 2 1 0 C T
A
K O
3 2 1 0 K
1 0 K
R
P
T
Read Data Register (DR)
S DEVICE ADDRESSES A
INSTRUCTION
DATA
A
A S
T 0 1 0 1 A A A A C 1 0 1 1 R R P P C 7 6 5 4 3 2 1 0 C T
A
K O
3 2 1 0 K
1 0 1 0 K
R
P
T
Write Data Register (DR)
S DEVICE ADDRESSES A
INSTRUCTION
DATA
A
A S
T 0 1 0 1 A A A A C 1 1 0 0 R R P P C 7 6 5 4 3 2 1 0 C T
A
K O
3 2 1 0 K
1 0 1 0 K
R
P
T
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
11
Doc. No. MD-2000 Rev. J
CAT5259
INSTRUCTION FORMAT (continued)
Gang Transfer Data Register (DR) to Wiper Control Register (WCR)
INSTRUCTION
S DEVICE ADDRESSES A
A S
T 0 1 0 1 A A A A C 0 0 0 1 R R 0 0 C T
A
K O
3 2 1 0 K
1 0
R
P
T
Gang Transfer Wiper Control Register (WCR) to Data Register (DR)
S DEVICE ADDRESSES A
INSTRUCTION
A S
T 0 1 0 1 A A A A C 1 0 0 0 R R 0 0 C T
A
K O
3 2 1 0 K
1 0
R
P
T
Transfer Wiper Control Register (WCR) to Data Register (DR)
S DEVICE ADDRESSES A
INSTRUCTION
A S
T 0 1 0 1 A A A A C 1 1 1 0 R R P P C T
A
3 2 1 0 K
1 0 1 0 K O
R
P
T
Transfer Data Register (DR) to Wiper Control Register (WCR)
S DEVICE ADDRESSES A
INSTRUCTION
A S
T 0 1 0 1 A A A A C 1 1 0 1 R R P P C T
A
3 2 1 0 K
1 0 1 0 K O
R
P
T
Increment (I)/Decrement (D) Wiper Control Register (WCR)
S DEVICE ADDRESSES A
INSTRUCTION
A
T 0 1 0 1 A A A A C 0 0 1 0 0 0 P P C I I
A
3 2 1 0 K
1 0 K \ \
R
D D
T
DATA
...
S
I I T
\ \ O
D D P
Note:
(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-2000 Rev. J
12
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5259
PACKAGE OUTLINE DRAWINGS
SOIC 24-Lead 300 mils (W)
(1)(2)
SYMBOL
E1
E
MIN
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
h
θ1
θ
θ1
L
A1
SIDE VIEW
c
END VIEW
Notes:
(1) All dimensions in millimeters. Angle in degrees.
(2)
Compiles with JEDEC standard MS-013.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
13
Doc. No. MD-2000 Rev. J
CAT5259
TSSOP 24-Lead 4.4 mm (Y)
(1)(2)
b
SYMBOL
MIN
NOM
A
E1
E
MAX
1.20
A1
0.05
0.15
A2
0.80
1.05
b
0.19
0.30
c
0.09
0.20
D
7.70
7.80
7.90
E
6.25
6.40
6.55
E1
4.30
4.40
4.50
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
Notes:
(1) All dimensions in millimeters. Angle in degrees.
(2)
Compiles with JEDEC standard MS-153.
Doc. No. MD-2000 Rev. J
14
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5259
EXAMPLE OF ORDERING INFORMATION (1)
Prefix
Device # Suffix
CAT
5259
Company ID
W
I
Package
W: SOIC
Y: TSSOP
-00
Temperature Range
I = Industrial (-40ºC to 85ºC)
Resistance
50: 50 kΩ
00: 100 kΩ
- T1
Tape & Reel
T: Tape & Reel
1: 1,000/Reel - SOIC
2: 2,000/Reel - TSSOP
Product Number
5259
ORDERING INFORMATION
Orderable Part Number
Resistance (kΩ)
CAT5259WI-50-T1
50
CAT5259WI-00-T1
100
CAT5259YI-50-T2
50
CAT5259YI-00-T2
100
CAT5259WI50
50
CAT5259WI00
100
CAT5259YI50
50
CAT5259YI00
100
Package
Lead Finish
SOIC
TSSOP
Matte-Tin
SOIC
TSSOP
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The device used in the above example is a CAT5259WI-00-T1 (SOIC, Industrial Temperature, 100 kΩ, Tape & Reel, 1,000/Reel).
(3) For additional package and temperature options, please contact your nearest ON Semiconductor Sales office
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
15
Doc. No. MD-2000 Rev. J
CAT5259
REVISION HISTORY
Date
Rev.
Description
12-Nov-04
C
Eliminated BGA package in all areas
Eliminated Commercial temperature range
Added “Green” package marking
18-Mar-04
D
Added TSSOP package in all areas
07-May-04
E
Updated Functional Diagram
Updated Pin Descriptions
Updated notes in Absolute Max. Ratings
Updated Potentiometer Characteristics table
Updated DC Characteristics table
Added Wiper table
Updated Write Protection text
Changed Figure 3 drawing to Start/Stop Condition from Start/Stop Timing
Changed Figure 4 title from Acknowledge Timing to Acknowledge Condition
Corrected Instruction Format for Gang Transfer Data Register (DR) to Wiper Control Register (WCR)
21-Sep-04
F
Updated DC Operating Characteristics table
23-Jan-08
G
Updated Example of Ordering Information
Updated Package Outline Drawings
Added MD- to document number
08-Apr-08
H
26-Nov-08
I
Change 2-wire with I²C
Update Ordering Part Number table
Change logo and fine print to ON Semiconductor
31-Jul-09
J
Update Ordering Information table
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Doc. No. MD-2000 Rev. J
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Characteristics subject to change without notice
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