ON CAT5409WI50 Quad digitally programmable potentiometers (dppâ ¢) with 64 taps and iâ²c interface Datasheet

CAT5409
Quad Digitally Programmable Potentiometers
(DPP™) with 64 Taps and I²C Interface
FEATURES
DESCRIPTION
„ Four linear taper digitally programmable
potentiometers
„ 64 resistor taps per potentiometer
„ End to end resistance 2.5 kΩ, 10 kΩ, 50 kΩ or
100 kΩ
„ I²C interface
„ Low wiper resistance, typically 80 Ω
„ Four non-volatile wiper settings for each
potentiometer
„ 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
„ 24-lead SOIC and 24-lead TSSOP
„ Write protection for data register
The CAT5409 is four Digitally Programmable
Potentiometers (DPP™) integrated with control logic
and 16 bytes of NVRAM memory.
A separate 6-bit control register (WCR) independently
controls the wiper tap position 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).
¯¯¯) pin protects against
The Write Protection (WP
inadvertent programming of the data register.
The CAT5409 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.
PIN CONFIGURATION
FUNCTIONAL DIAGRAM
SOIC (W)
TSSOP (Y)
RH0
SDA
1
24 WP
VCC
1
24 NC
A1
2
23 A2
RL0
2
23 RL3
RL1
3
22 RW0
RH0
3
22 RH3
RH1
4
21 RH0
RW0
4
21 RW3
RW1
5
20 RL0
A2
5
20 A0
GND
6
19 VCC
WP
6
19 NC
NC
7
18 NC
SDA
7
18 A3
RW2
8
17 RL3
A1
8
17 SCL
RH2
9
16 RH3
RL1
9
16 RL2
RL2 10
15 RW3
RH1
10
15 RH2
SCL 11
14
RW1
11
14
A3 12
A0
13 NC
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
GND 12
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
RW2
13 NC
1
Doc. No. MD-2010 Rev. M
CAT5409
PIN DESCRIPTIONS
Pin#
(SOIC)
Pin#
(TSSOP)
Name
19
1
VCC
20
2
RL0
21
3
RH0
22
4
RW0
23
24
1
2
5
6
7
8
A2
¯¯¯
WP
SDA
A1
3
9
RL1
4
10
RH1
5
11
RW1
6
7
12
13
GND
NC
8
14
RW2
9
15
RH2
10
16
RL2
11
12
13
14
17
18
19
20
SCL
A3
NC
A0
15
21
RW3
16
22
RH3
17
23
RL3
18
24
NC
SCL: Serial Clock
The CAT5409 serial clock input pin is used to clock all
data transfers into or out of the device.
Function
Supply Voltage
Low Reference Terminal
for Potentiometer 0
High Reference Terminal
for Potentiometer 0
Wiper Terminal for
Potentiometer 0
Device Address
SDA: Serial Data
The CAT5409 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 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 CAT5409.
Write Protection
Serial Data Input/Output
Device Address
Low Reference Terminal
for Potentiometer 1
High Reference Terminal
for Potentiometer 1
Wiper Terminal for
Potentiometer 1
Ground
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.
No Connect
Wiper Terminal for
Potentiometer 2
High Reference Terminal
for Potentiometer 2
Low Reference Terminal
for Potentiometer 2
Bus Serial Clock
¯¯¯
WP: Write Protect Input
The ¯¯¯
WP pin when tied low prevents non-volatile writes
to the data registers (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 7 for more details.
Device Address
No Connect
Device Address, LSB
Wiper Terminal for
Potentiometer 3
High Reference Terminal
for Potentiometer 3
Low Reference Terminal
for Potentiometer 3
No Connect
DEVICE OPERATION
The CAT5409 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 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 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.
Doc. No. MD-2010 Rev. M
2
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5409
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
±12
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
RPOT
RPOT
IW
RW
RW
VTERM
TCRPOT
TCRATIO
CH/CL/CW
fc
Parameter
Potentiometer Resistance (-00)
Potentiometer Resistance (-50)
Potentiometer Resistance (-10)
Potentiometer Resistance (-2.5)
Potentiometer Resistance
Tolerance
RPOT Matching
Power Rating
Wiper Current
Wiper Resistance
Wiper Resistance
Voltage on any RH or RL Pin
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 = ±3 mA @ VCC = 3 V
IW = ±3 mA @ VCC = 5 V
VSS = 0 V
80
GND
kΩ
kΩ
kΩ
kΩ
±20
%
1
50
±6
300
150
VCC
%
mW
mA
Ω
Ω
V
%
LSB (7)
LSB (7)
ppm/ºC
ppm/ºC
pF
MHz
1.6
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
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 / 63 or (RH - RL) / 63, single pot.
(8) n = 0, 1, 2, ..., 63
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-2010 Rev. M
CAT5409
D.C. OPERATING CHARACTERISTICS
Over recommended operating conditions unless otherwise stated.
Symbol
Parameter
Test Conditions
ICC
Power Supply Current
ISB
Min
Max
Units
fSCL = 400 kHz
1
mA
Standby Current (VCC = 5 V)
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 V)
0.4
V
IOL = 3 mA
CAPACITANCE (1)
TA = 25ºC, f = 1.0 MHz, VCC = 5 V
Symbol
Test
Conditions
Max.
Units
CI/O
Input/Output Capacitance (SDA)
VI/O = 0 V
8
pF
CIN
Input Capacitance (A0, A1, A2, A3, SCL, ¯¯¯
WP)
VIN = 0 V
6
pF
A.C. CHARACTERISTICS
Over recommended operating conditions unless otherwise stated.
Symbol
Max
Units
Clock Frequency
400
kHz
TI
Noise Suppression Time Constant at SCL, SDA Inputs
50
ns
tAA
SLC Low to SDA Data Out and ACK Out
0.9
µs
fSCL
(1)
Parameter
Min
Typ
tBUF(1)
Time the bus must be free before a new transmission can
start
1.2
µs
tHD:STA
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
100
ns
(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)
Symbol
Parameter
Max
Units
tPUR
Power-up to Read Operation
1
ms
tPUW
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.
Doc. No. MD-2010 Rev. M
4
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5409
WRITE CYCLE LIMITS
Symbol
Parameter
tWR
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
Symbol
NEND
(1)
TDR(1)
VZAP(1)
ILTH(1) (2)
Parameter
Reference Test Method
Min
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
V
Latch-Up
JEDEC Standard 17
100
mA
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
SDA
8TH BIT
ACK
BYTE n
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
Figure 3. Start/Stop Timing
SDA
SCL
START CONDITION
STOP CONDITION
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.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-2010 Rev. M
CAT5409
most significant bits of the 8-bit slave address are
fixed as 0101 for the CAT5409 (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, +5 V
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 CAT5409 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
CAT5409 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 CAT5409 monitors the
SDA and SCL lines and will not respond until this
condition is met.
The CAT5409 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 CAT5409 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 CAT5409 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
of the particular slave device it is requesting. The four
Figure 4. Acknowledge Timing
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
ACKNOWLEDGE
START
Doc. No. MD-2010 Rev. M
6
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5409
host's write operation, the CAT5409 initiates the
internal write cycle. ACK polling can be initiated
immediately. This involves issuing the start condition
followed by the slave address. If the CAT5409 is still
busy with the write operation, no ACK will be returned.
If the CAT5409 has completed the write operation, an
ACK will be returned and the host can then proceed
with the next instruction operation.
WRITE OPERATIONS
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 CAT5409. 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 CAT5409
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.
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 going low after start but after
start will interrupt non-volatile write to data registers,
while the ¯¯¯
WP pin going low after internal write cycle
has started, will have no effect on any write operation.
The CAT5409 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.
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
Figure 5. Slave Address Bits
CAT5409
0
1
0
1
A3
*
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.
A2
A1
A0
Figure 6. Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
INSTRUCTION
BYTE
SLAVE/DPP
ADDRESS
Fixed
Variable
op code
DR1 WCRDATA
P
S
A
C
K
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
Register Pot/WCR
Address Address
S
T
O
P
A
C
K
7
A
C
K
Doc. No. MD-2010 Rev. M
CAT5409
INSTRUCTION AND REGISTER
DESCRIPTION
INSTRUCTION BYTE
The next byte sent to the CAT5409 contains the
instruction and register pointer information. The four
most significant bits used provide the instruction
opcode I [3:0]. 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.
SLAVE ADDRESS BYTE
The first byte sent to the CAT5409 from the master/
processor is called the Slave/DPP Address Byte. The
most significant four bits of the Device Type address
are a device type identifier. These bits for the
CAT5409 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 CAT5409 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
ID3
0
ID2
1
ID1
0
Slave Address
ID0
1
A3
A2
A1
(MSB)
A0
(LSB)
Table 2. Instruction Byte Format
Instruction
Opcode
I3
(MSB)
Doc. No. MD-2010 Rev. M
I2
Data Register
Selection
I1
I0
R1
8
R0
WCR/Pot Selection
P1
P0
(LSB)
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5409
Registers is a non-volatile operation and will take a
maximum of 5ms.
WIPER CONTROL AND DATA REGISTERS
Wiper Control Register (WCR)
The CAT5409 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
— 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 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
The Wiper Control Register is a volatile register that
loses its contents when the CAT5409 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 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
four Data Registers and the associated Wiper Control
Register. Any data changes in one of the Data
Table 3. Instruction Set
Note: 1/0 = data is one or zero
Instruction Set
Instruction
I3
1
I2
0
I1
0
I0
1
R1
0
R0
0
Write Wiper Control
Register
1
0
1
0
0
Read Data Register
1
0
1
1
Write Data Register
1
1
0
XFR Data Register to
Wiper Control Register
1
1
XFR Wiper Control
Register to Data
Register
1
Gang XFR Data
Registers to Wiper
Control Registers
Gang XFR Wiper
Control Registers to
Data Register
Read Wiper Control
Register
Increment/Decrement
Wiper Control Register
Operation
WCR1/ P1
1/0
WCR0/ P0
1/0
0
1/0
1/0
Write new value to the Wiper Control
Register pointed to by P1-P0
1/0
1/0
1/0
1/0
0
1/0
1/0
1/0
1/0
0
1
1/0
1/0
1/0
1/0
Read the contents of the Data Register
pointed to by P1-P0 and R1-R0
Write 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
1
1
0
1/0
1/0
1/0
1/0
Transfer the contents of the Wiper Control
Register pointed to by P1-P0 to the Data
Register pointed to by R1-R0
0
0
0
1
1/0
1/0
0
0
Transfer the contents of the Data Registers
pointed to by R1-R0 of all four pots to their
respective Wiper Control Registers
1
0
0
0
1/0
1/0
0
0
Transfer the contents of both Wiper Control
Registers to their respective data Registers
pointed to by R1-R0 of all four pots
0
0
1
0
0
0
1/0
1/0
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
9
Read the contents of the Wiper Control
Register pointed to by P1-P0
Enable Increment/decrement of the Control
Latch pointed to by P1-P0
Doc. No. MD-2010 Rev. M
CAT5409
— 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.
position), to a Data Register is a write to non-volatile
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.
Four instructions require a two-byte sequence to
complete, as illustrated in Figure 7. These instructions
transfer data between the host/processor and the
CAT5409; 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 CAT5409 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.
— 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
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-2010 Rev. M
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
CAT5409
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
0
0
P1
P0
A
C
K
DATA
7
0
6
0
5
4
3
2
1
0
A
C
K
S
T
O
P
A
C
K
S
T
O
P
A
C
K
S
T
O
P
A
C
K
S
T
O
P
Write 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
1
0
0
0
P1
P0
A
C
K
DATA
7
0
6
0
5
4
3
2
1
0
Read Data Register (DR)
S
T
A
R
T
DEVICE ADDRESSES
0
1
0
1
A3
A2
A1
A0
A
C
K
INSTRUCTION
1
0
1
1
R1
R0
P1
P0
A
C
K
DATA
7
0
6
0
5
4
3
2
1
0
Write Data Register (DR)
S
T
A
R
T
DEVICE ADDRESSES
0
1
0
1
A3
A2
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
A1
A0
A
C
K
INSTRUCTION
1
1
0
0
R1
11
R0
P1
P0
A
C
K
DATA
7
0
6
0
5
4
3
2
1
0
Doc. No. MD-2010 Rev. M
CAT5409
INSTRUCTION FORMAT (continued)
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
0
0
0
1
R1
R0
0
0
A
C
K
S
T
O
P
A
C
K
S
T
O
P
A
C
K
S
T
O
P
A
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
1
0
0
0
R1
R0
0
0
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
1
1
1
0
R1
R0
P1
P0
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
1
1
0
1
R1
R0
P1
P0
Increment (I)/Decrement (D) Wiper Control Register (WCR)
S
T
A
R
T
DEVICE ADDRESSES
0
1
0
1
A3
A2
A1
A0
A
C
K
INSTRUCTION
0
0
1
0
0
0
P1
P0
A
C
K
DATA
I/D
I/D
...
I/D
I/D
S
T
O
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-2010 Rev. M
12
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5409
PACKAGE OUTLINE DRAWINGS
SOIC 24-Lead 300 mils (W)
(1)(2)
E1
SYMBOL
MIN
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
e
b
e
PIN#1 IDENTIFICATION
NOM
MAX
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-2010 Rev. M
CAT5409
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 MO-153.
Doc. No. MD-2010 Rev. M
14
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT5409
EXAMPLE OF ORDERING INFORMATION (1)
Prefix
Device #
CAT
5409
Company ID
Suffix
W
I
Package
W: SOIC
Y: TSSOP
-00
Temperature Range
I = Industrial (-40ºC to 85ºC)
Resistance
25: 2.5 kΩ
10: 10 kΩ
50: 50 kΩ
00: 100 kΩ
- T1
Tape & Reel
T: Tape & Reel
1: 1,000/Reel – SOIC
2: 2,000/Reel – TSSOP
Product Number
5409
ORDERING INFORMATION
Orderable Part Number
Resistance (kΩ)
CAT5409WI-25-T1
2.5
CAT5409WI-10-T1
10
CAT5409WI-50-T1
50
CAT5409WI-00-T1
100
CAT5409YI-25-T2
2.5
CAT5409YI-10-T2
10
CAT5409YI-50-T2
50
CAT5409YI-00-T2
100
CAT5409WI25
2.5
CAT5409WI10
10
CAT5409WI50
50
CAT5409WI00
100
CAT5409YI25
2.5
CAT5409YI10
10
CAT5409YI50
50
CAT5409YI00
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 CAT5409WI-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-2010 Rev. M
CAT5409
REVISION HISTORY
Date
Rev.
08-Oct-03
H
Description
Updated Features
Updated Description
I
Changed Preliminary designation to Final
Eliminated Commercial temp range in all areas
Updated ¯¯¯
WP Pin Description
Updated notes in Absolute Max Ratings and Potentiometer Characteristics
02-May-08
J
Deleted BGA package
Updated Potentiometer Characteristics table
Update Package Outline Drawings
Updated Example of Ordering Information
Added MD- to document number
07-Apr-08
K
Change 2-wire with I²C
Update Ordering Part Number table
26-Nov-08
L
Change logo and fine print to ON Semiconductor
31-Jul-09
M
Update Ordering Information table
29-Apr-06
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Doc. No. MD-2010 Rev. M
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16
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Characteristics subject to change without notice
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