intersil X9428 DATA SHEET

查询X9428WS-2.7供应商
®
Low Noise/Low Power/2-Wire Bus
Data Sheet March 8, 2005
Single Digitally Controlled Potentiometer (XDCP™)
FEATURES
• Solid state potentiometer
• 2-wire serial interface
• Register oriented format —Direct Read/Write/Transfer Wiper Position —Store as many as Four Positions per
Potentiometer
• Power supplies —V —V+ = 2.7V to 5.5V —V– = -2.7V to -5.5V
• Low power CMOS —Standby current < 1µA —Ideal for Battery Operated Applications
• High reliability —Endurance–100,000 Data Changes per Bit per
—Register Data Retention–100 years
• 4-bytes of nonvolatile memory
•10kΩ resistor array
• Resolution: 64 taps each potentiometer
• SOIC and TSSOP packages
= 2.7V to 5.5V
CC
Register
FN8197.0
DESCRIPTION
The X9428 integrates a digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated microcircuit.
The digitally controlled potentiometer is implemented using 63 resistive elements in a series array. Between each element are tap points connected to the wiper terminal through switches. The position of the wiper on the array is controlled by the user th rough the 2-wire bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and 4 nonvolatile Data Registers (DR0:DR3) that can be directly written to and read by the user. The contents of the WCR controls the position of the wiper on the resistor array through the switches. Pow er-up recalls the contents of DR0 to the WCR.
The XDCP can be used as a three-terminal potentiometer or as a two-term inal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.
BLOCK DIAGRAM
V V
SCL SDA
WP
CC SS
V+ V–
A0 A2 A3
Interface
and
Control
Circuitry
Data
R0 R1
8
R2 R3
Wiper
Counter Register
(WCR)
VH/R
VL/R
VW/R
H
L
W
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
X9428
PIN DESCRIPTIONS
Host Interface Pins
Serial Clock (SCL)
The SCL input is used to clock data into and out of the X9428.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into and out of the device. It is an open drain output and may be wire-ORed with any number of open drain or open collector outputs. An open drain output requires the use of a pull-up resistor. For selecting typical values, refer to the guidelines for calculating typical values on the bus pull-up resistors graph.
Device Address (A
, A2, A3)
0
The Address inputs are used to set the least significant 3 bits of the 8-bit slav e addres s. A matc h in the slave address serial data stream must be made with the Address input in order to initiate communication with the X9428. A maximum of 8 devices may occupy the 2-wire serial bus.
Potentiometer Pins
PIN CONFIGURATION
V
R
L/VL
RH/V
RW/V
SDA
CC
A2
W
WP
V
SS
A2 R
R
R
SDA
WP
V
H
SS
1 2
3 4
5 6
7 8
1
L
2 3
H
4
W
5 6 7
DIP/SOIC
X9428
TSSOP
X9428
16 15
14 13
12 11
10 9
14 13 12 11 10
V+ NC A0 NC A3 SCL NC V-
V
CC
V+ A0 NC A3 SCL
9
V-
8
R
, RL/V
H/VH
L
The RH/VH and RL/VL inputs are equivalent to the terminal connections on either end of a mechanical potentiometer.
R
W/VW
The wiper outputs are equivalent to the wiper output of a mechanical potentiometer.
Hardware Write Protect Input WP
The WP pin when low prevents nonvolatile writes to the Data Registers.
Analog Supply V+, V-
The Analog Supply V+, V- are the supply voltages for the XDCP analog section.
PIN NAMES
Symbol Description
SCL Serial clock
SDA Serial data
A0, A2, A3 Device address
R
, VL/RHPotentiometer Pins
H/VH
(terminal equivalent)
R
W/VW
WP
Potentiometer Pin (wiper equivalent) Hardware write protection
V+,V- Analog and voltage follower
V
CC
V
SS
System supply voltage System ground
NC No connection
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March 8, 2005
X9428
PRINCIPLES OF OPERATION
The X9428 is a highly integrated microcircuit incorporating a resistor array and its associated registers and counters and the serial interface logic providing direct communication between the host and the XDCP potentiometers.
Serial Interface
The X9428 supports a bidirectional bus oriented protocol. The protocol defines any device that sends data onto the bus as a transmitter and the receiving device as the receiver. The device controlling the transfer is a master 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 X9428 will be considered a slave device in all applications.
Clock and Data Conventions
Data states on the SDA line can change only during SCL LOW periods (tLOW). SDA state changes during SCL HIGH are reserved for indicating start and stop conditions.
The X9428 will respond with an acknowledge after recognition of a start condition and its slave address and once again after successful receipt of the command byte. If the command is followed by a data byte the X9428 will respond with a final acknowledge.
Array Description
The X9428 is comprised of a resistor array. The array contains 63 discrete resistive segments that are connected in series. The physical ends of the array are equivalent to the fixed terminals of a mechanical potentiometer (V
and VL/RL inputs).
H/RH
At both ends of the array and between each resistor segment is a CMOS switch connected to the wiper (V
) output. Within each individual array only one
W/RW
switch may be turned on at a time. These switches are controlled by the Wiper Counter Register (WCR). The six bits of the WCR are decoded to select, and enable, one of sixty-four switches.
The WCR may be written directly, or it can be changed by transferring the contents of one of four associated Data Registers into the WCR. These Data Registers and the WCR can be read and written by the host system.
Start Condition
All commands to the X9428 are preceded by the start condition, which is a HIGH to LOW transition of SDA while SCL is HIGH (t
). The X9428 continuously
HIGH
monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition is met.
Stop Condition
All communications must be terminated by a stop condition, which is a LOW to HIGH transition of SDA while SCL is HIGH.
Acknowledge
Acknowledge is a software convention used to provide a positive handshake between the master and slave devices on the bus to indicate the successful receipt of data. The transmitting device, either the master or the slave, will release the SDA bus after transmitting eight bits. The master generates a ninth clock cycle and during this period the receiver pulls the SDA line LOW to acknowledge that it successfully received the eight bits of data.
Device Addressing
Following a start condition the master must output the address of the slave it is accessing. The most significant four bits of the slave address are the device type identifier (refer to Figure 1 below). For the X9428 this is fixed as 0101[B].
Figure 1. Slave Address
Device Type
Identifier
100
1
A3 A2 0 A0
Device Address
The next four bits of the slave address are the device address. The physical device address is defined by the state of the A
, A2, A3 inputs. The X9428
0
compares the serial data stream with the address input state; a successful compa re of all four address bits is required for the X9428 to respond with an acknowledge. The A driven by CMOS input signals or tied to V
, A2, A3 inputs can be actively
0
or VSS.
CC
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X9428
Acknowledge Polling
The disabling of the inputs, during the internal nonvolatile write operation, can be used to take advantage of the typical 5ms EEPROM write cycle time. Once the stop condition is issued to indicate the end of the nonvolatile write command the X9428 initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the device slave address. If the X9428 is still busy with the write operation no ACK will be returned. If the X9428 has completed the write operation an ACK will be returned, and the master can then proceed with the next operation.
Flow 1. ACK Polling Sequence
Nonvolatile Write
Command Completed
Enter ACK Polling
Issue
START
Issue Slave
Address
ACK
Returned?
YES
Further
Operation?
YES
Issue
Instruction
NO
NO
Issue STOP
Issue STOP
Figure 2. Instruction Byte Format
Register
Select
I1I2I3 I0 R1 R0 0 0
Instructions
The four high order bits define the instruction. The next two bits (R1 and R0) select one of the four registers that is to be acted upon when a register oriented instruction is issued. Bits 0 and 1 are defined to be 0.
Four of the seven instructions end with the transmission of the instruction byte. The basic sequence is illustrated in Figure 3. These two-byte instructions exchange data between the Wiper Counter Register and one of the Data Registers. A transfer from a Data Register to a Wiper Counter Register is essentially a write to a static RAM. The response of the wiper to this action will be delayed t
. A transfer from the Wiper Counter
WRL
Register (current wiper position), to a Data Register is a write to nonvolatile memory and takes a minimum of t
to complete.
WR
Four instructions require a three-byte sequence to complete. These instructions transfer data between the host and the X9428; either between the host and one of the Data Registers or directly between the host and the Wiper Counter Register. These instructions are: Read Wiper Counter Register (read the current wiper position of the selected pot), write Wiper Counter Register (change current wiper position of the selected pot), read Data Register (read the contents of the selected nonvolatile register) and write Data Register (write a new value to the selected Data Register). The sequence of operations is shown in Figure 4.
Proceed
Proceed
Instruction Structure
The next byte sent to the X9428 contains the instruction and register pointer information. The four most significant bits are the instruction. The next four bits point to one of four associated registers. The format is shown below in Figure 2.
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Figure 3. Two-Byte Instruction Sequence
SCL
SDA
S
0101A3A20A0A T A R T
X9428
I3 I2 I1 I0 R1 R0 0 0 A C K
S
C
T
K
O P
The Increment/Decrement command is different from the other commands. Once the command is issued and the X9428 has responded with an acknowledge, the master can clock the selected wiper up and/or down in one segment steps; th ereby, providing a fine tuning capability to the host. For each SCL clock pulse (t
) while SDA is HIGH, the selected wiper will
HIGH
move one resistor segment towards the V
H/RH
terminal. Similarly, for each SCL clock pulse while SDA is LOW, the selected wiper will move one resistor segment towards the V
terminal. A detailed
L/RL
illustration of the sequence and timing for this operation are shown in Figures 5 and 6 respectively.
Table 1. Instruction Set
Instruction Set
Instruction
Read Wiper Counter
0
1 0 0 1 0 0 0 0 Read the contents of the Wiper Counter Register
OperationI3I2I1I0R1R0X1X
Register Write Wiper Counter
1 0 1 0 0 0 0 0 Write new value to the Wiper Counter Register
Register Read Data Register 1 0 1 1 1/0 1/0 0 0 Read the contents of the Data Register pointed to by
R
- R
1
0
Write Data Register 1 1 0 0 1/0 1/0 0 0 Write new value to the Data Register pointed to by
- R
R
1
0
XFR Data Register to Wiper Counter Register
XFR Wiper Counter Register to Data Register
Increment/Decrement Wiper Counter Register
Note: (7) 1/0 = data is one or zero
1 1 0 1 1/0 1/0 0 0 Transfer the contents of the Data Register pointed to
- R0 to its Wiper Counter Register
by R
1
1 1 1 0 1/0 1/0 0 0 Transfer the contents of the Wiper Counter Register
to the Data Register pointed to by R
- R
1
0
0 0 1 0 0 0 0 1/0 Enable Increment/decrement of the Wiper Counter
Register
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March 8, 2005
X9428
Figure 4. Three-Byte Instruction Sequence
SCL
SDA
S
0 1 0 1 A3 A2 0 A0 A T A R T
Figure 5. Increment/Decrement Instruction Sequence
SCL
I3 I2 I1 I0 R1 R0 0 0 A C K
0 0 D5 D4 D3 D2 D1 D0 C K
A
S
C
T
K
O P
SDA
S
0101A3A20A0A T A R T
C K
Figure 6. Increment/Decrement Timing Limits
INC/DEC
CMD
Issued
SCL
SDA
VW/R
W
Voltage Out
XX
I3 I2 I1 I0 R0 0 0 A
R1
I N C 1
t
WRID
I N C 2
C K
D
I
E
N
C
C
1
n
S
D
T
E
O
C
P
n
6
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March 8, 2005
Figure 7. Acknowledge Response from Receiver
X9428
SCL from
Master
Data Output
from Transmitter
Data Output
from Receiver
START
1
Figure 8. Detailed Potentiometer Block Diagram
Serial Data Path From Interface
Circuitry
Register 0 Register 1
8 6
Register 2 Register 3
If WCR = 00[H] then VW/RW = VL/R If WCR = 3F[H] then VW/RW = VH/R
L
H
UP/DN
Modified SCL
Serial Bus
Input
Parallel Bus
Input
Register
UP/DN CLK
89
Acknowledge
C o
u n
t
e
r
Wiper
Counter
(WCR)
INC/DEC
Logic
D
e c o d
e
VH/R
VL/R
H
L
VW/R
W
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March 8, 2005
X9428
DETAILED OPERATION
The potentiometer has a Wiper Co unter Register and four Data Registers. A detailed discussion of the register organization and array operation follows.
Wiper Counter Register
The X9428 contains a Wiper Counter Register. The Wiper Counter Register can be envisioned as a 6-bit parallel and serial load counter with its outputs decoded to select one of sixty-four switches along its resistor array. The contents of the WCR can be altered in four ways: it may be written directly by the host via the write Wiper Counter Register instruction (serial load); it may be written indirectly by transferring the contents of one of four associated Da ta Registers via the XFR Data Register instruction (parallel load); it can be modified one step at a time by the Increment/Decrement instruction. Finally, it is loaded with the contents of its Data Register zero (DR0) upon power-up.
The WCR is a volatile register; that is, its contents are lost when the X9428 is powered-down. Although the register is automatically loaded with the value in DR0 upon power-up, it should be noted this may be different from the value present at power-do wn.
Data Registers
The potentiometer has four nonvolatile Data Registers. These can be read or written directly by the host and data can be transferred b etween any of the four Data Registers and the Wiper Counter Register. It should be noted all operations changing data in one of these registers is a nonvolatile operation and will take a maximum of 10ms.
Register Descriptions
Data Registers, (6-Bit), Nonvolatile
D5 D4 D3 D2 D1 D0 NV NV NV NV NV NV
(MSB) (LSB)
Four 6-bit Data Registers for each XD CP. (eight 6-bit registers in total).
– {D5~D0}: These bits are for general purpose not
volatile data storage or for storage of up to four different wiper values. The contents of Data Register 0 are automatically moved to the Wiper Counter Register on power-up.
Wiper Counter Register, (6-Bit), Volatile
WP5 WP4 WP3 WP2 WP1 WP0
VVVVVV
(MSB) (LSB)
One 6-bit wiper counter register for each XDCP. (Four 6-bit registers in total.)
– {D5~D0}: These bits specify the wiper position of the
respective XDCP. The Wiper Counter Register is loaded on power-up by the value in Data Register 0. The contents of the WCR can be loaded from any of the other Data Register or directly. The contents of the WCR can be saved in a DR.
If the application does not require storage of multiple settings for the potentiometer, these registers can be used as regular memory loca tions that could possibly store system parameters or user preference data.
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X9428
Instruction Format
Notes: (1) “MACK”/”SACK”: stands for the acknowledge sent by the master/slave.
(2) “A3 ~ A0”: stands for the device addresses sent by the master. (3) “X”: indicates that it is a “0” for testing purpose but physically it is a “don’t care” condition. (4) “I”: stands for the increment operation, SDA held high during active SCL phase (high). (5) “D”: stands for the decrement operation, SDA held low during active SCL phase (high).
Read Wiper Counter Register (WCR)
S
device type
T
identifier A R
0101
T
Write Wiper Counter Register (WCR)
S
device type
T
identifier A R
0101
T
device
addresses
A3A
0
2
device
addresses
A3A
0
2
instruction
S
opcode
A C
A
10010000 00WP
K
0
instruction
S
opcode
A C
A
10100000 00WP
K
0
S
(sent by slave on SDA)
A C K
S
(sent by master on SDA)
A C K
wiper position
W
W
W
P
P
P
5
4
3
2
wiper position
W
W
W
P
P
P
5
4
3
2
W
W
M
S
A
W P 1
W P 1
T
C
O
P
K
P
0
S
S
A
T
C
O
P
K
P
0
Read Data Register (DR)
S
device type
T
identifier A R
0101
T
device
addresses
A3A
0
2
S A C
A
K
0
instruction
opcode
1011
register
addresses
R1R
00 00WP
0
S A C K
Write Data Register (DR)
S
device type
T
identifier A R
0101
T
device
addresses
A3A
0
2
S A C
A
K
0
instruction
opcode
1100
register
addresses
R1R
00 00WP
0
S A C K
XFR Data Register (DR) to Wiper Counter Register (WCR)
S
device type
T
identifier A R
0101
T
device
addresses
A3A
0
2
S A C
A
K
0
instruction
opcode
1101
register
addresses
R1R
00
0
S A C K
wiper position/data
(sent by slave on SDA)
W
W
W
W
P
P
P
P
5
4
3
2
1
wiper position/data
(sent by master on SDA)
W
W
W
W
P
P
P
P
5
4
3
2
1
S T O P
W P
0
W P
0
M
S
A
T
C
O
K
P
S
S
HIGH-VOLTAGE
A
T
C
K
WRITE CYCLE
O P
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March 8, 2005
X9428
XFR Wiper Counter Register (WCR) to Data Register (DR)
S
device type
T
identifier A R
0101
T
Increment/Decrement Wiper Counter Register (WCR)
S
device type
T
identifier A R
0101
T
SYMBOL TABLE Guidelines for Calculating Typical Values of Bus
device
addresses
A3A
0
2
device
addresses
A3A
2
instruction
S
opcode
A C
A
1110
K
0
instruction
S
opcode
A C
A
0
00100000
K
0
register
addresses
R1R
00
0
S
S A C K
HIGH-VOLTAGE
T
WRITE CYCLE
O
P
increment/decrement
S
(sent by master on SDA)
A C
I/DI/
K
....
D
I/DI/
S T O P
D
Pull-Up Resistors
WAVEFORM INPUTS OUTPUTS
Must be steady
May change from Low to High
May change from High to Low
Don’t Care: Changes Allowed
N/A Center Line
Will be steady
Will change from Low to High
Will change from High to Low
Changing: State Not Known
is High Impedance
Resistance (K)
120
R
100
80 60
40 20
0
MIN
R
MAX
Max. Resistance
Min. Resistance
20 40 60 80 100 120
0
Bus Capacitance (pF)
=
=
V
CC MAX
I
OL MIN
t
R
C
BUS
=1.8k
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FN8197.0
March 8, 2005
X9428
ABSOLUTE MAXIMUM RATINGS
Temperature under bias....................-65°C to +135°C
Storage temperature .........................-65°C to +150°C
Voltage on SDA, SCL or any address
input with respect to V Voltage on V+ (referenced to V Voltage on V- (referenced to V
......................... -1V to +7V
SS
)........................10V
SS
)........................-10V
SS
(V+) - (V-) ..............................................................12V
Any V Any V
..............................................................V+
H/RH
.................................................................V-
L/RL
COMMENT
Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only; functional operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Lead temperature (soldering, 10 seconds)........ 300°C
I
(10 seconds)................................................±12mA
W
RECOMMENDED OPERATING CONDITIONS
Temp Min. Max.
Commercial 0°C+70°C
Industrial -40°C+85°C
Device Supply Voltage (VCC) Limits
X9428 5V ± 10%
X9428-2.7 2.7V to 5.5V
ANALOG CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Limits
Symbol Parameter
Test ConditionsMin. Typ. Max. Unit
End to end resistance tolerance ±20 % Power rating 50 mW 25°C, each pot
I
W
R
W
Wiper current ±6 mA Wiper resistance 150 250 Wiper current = ± 1mA, VCC = 3V
40 100 Wiper current = ± 1mA, V
V+ Voltage on V+ pin X9428 +4.5 +5.5 V
X9428-2.7 +2.7 +5.5
V- Voltage on V- pin X9428 -5.5 -4.5 V
X9428-2.7 -5.5 -2.7
V
TERM
Voltage on any VH/RH or VL/RL pin V- V+ V Noise -140 dBV Ref: 1kHz Resolution Absolute linearity Relative linearity Temperature Coefficient of R
(4)
(1)
(2)
TOTAL
1.6 % ±1 MI
±0.2 MI
(3) (3)
±300 ppm/°C
V
w(n)(actual)
V
w(n + 1 )
- [V
- V
w(n) + MI
Ratiometric Temperature Coefficient ±20 ppm/°C
C
/CWPotentiometer Capacitances 10/10/25 pF See Circuit #3,
H/CL
Spice Macromodel
= 5V
CC
w(n)(expected)
]
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X9428
D.C. OPERATING CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.)
Limits
Symbol Parameter
I
CC1
I
CC2
I
SB
I
LI
I
LO
V
IH
V
IL
V
OL
Notes: (1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
VCC supply current (nonvolatile write)
VCC supply current (mov e w i p e r , write, read)
1mAf
Other Inputs = V
100 µA f
Other Inputs = V VCC current (standby) 1 µA SCL = SDA = VCC, Addr. = V Input leakage current 10 µA VIN = VSS to V Output leakage current 10 µA V Input HIGH voltage VCC x 0.7 VCC x 0.5 V Input LOW voltage -0.5 VCC x 0.1 V Output LOW voltage 0.4 V IOL = 3mA
potentiometer.
(2) Relative linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a potentiom-
eter. It is a measure of the error in step size. (3) MI = RTOT/63 or (R (4) Max. = all four arrays cascaded together, Typical = individual array resolutions.
- RL)/63, single pot
H
Test ConditionsMin. Typ. Max. Unit
= 400kHz, SDA = Open,
SCL
SS
= 400kHz, SDA = Open,
SCL
SS
CC
= VSS to V
OUT
CC
SS
ENDURANCE AND DATA RETENTION
Parameter Min. Unit
Minimum endurance 100,000 Data changes per bit per register
Data retention 100 Years
CAPACITANCE
Symbol Test Max. Unit Test Conditions
(5)
C
I/O
(5)
C
IN
Input/output capacitance (SDA) 8 pF V
I/O
= 0V
Input capacitance (A0, A1, A2, A3, and SCL) 6 pF VIN = 0V
POWER-UP TIMING
Symbol Parameter Min. Typ. Max. Unit
(6)
t
PUR
t
PUW
t
RVCC
(6)
(7)
Power-up to initiation of read operation 1 ms Power-up to initiation of write operation 5 ms VCC Power-up ramp rate 0.2 50 V/msec
POWER-UP AND POWER-DOWN
There are no restrictions on the power-up or power-down sequencing of the bias supplies V
, V+, and V- provided
CC
that all three supplies reach their final value s within 1msec of each other. However, at all times, the voltages on the potentiometer pins must be less than V+ and more than V-. The recall of the wiper position from nonvolatile memory is not in effect until all supplies reach their final value.
Notes: (5) This parameter is periodically sampled and not 100% tested
(6) t
(7) Sample tested only.
and t
PUR
instruction can be issued. These parameters are periodically sampled and not 100% tested.
are the delays required from the time the third (last) power supply (VCC, V+ or V-) is stable until the specific
PUW
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X9428
A.C. TEST CONDITIONS
I
nput pulse levels VCC x 0.1 to VCC x 0.9 Input rise and fall times 10ns Input and output timing level V
CC
x 0.5
Circuit #3 SPICE Macro Model
R
R
H
TOTAL
C
H
C
C
L
W
10pF
EQUIVALENT A.C. LOAD CIRCUIT
SDA Output
5V
1533
100pF
10pF
2.7V
100pF
25pF
R
W
AC TIMING (over recommended operating conditions)
Symbol Parameter Min. Max. Unit
f
SCL
t
CYC
t
HIGH
t
LOW
t
SU:STA
t
HD:STA
t
SU:STO
t
SU:DAT
t
HD:DAT
t
R
t
F
t
AA
t
DH
T
I
t
BUF
t
SU:WPA
t
HD:WPA
Clock frequency 100 400 kHz Clock cycle time 2500 ns Clock high time 600 ns Clock low time 1300 ns Start setup time 600 ns Start hold time 600 ns Stop setup time 600 ns SDA data input setup time 100 ns SDA data input hold time 30 ns SCL and SDA rise time 300 ns SCL and SDA fall time 300 ns SCL low to SDA data output valid time 900 ns SDA data output hold time 50 ns Noise suppression time constant at SCL and SDA inputs 50 ns Bus free time (prior to any transmission) 1300 ns WP, A0, A1, A2 and A3 setup time 0 ns WP, A0, A1, A2 and A3 hold time 0 ns
R
L
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X9428
HIGH-VOLTAGE WRITE CYCLE TIMING
Symbol Parameter Typ. Max. Unit
t
WR
XDCP TIMING
Symbol Parameter Min. Max. Unit
t
WRPO
t
WRL
t
WRID
Note: (8) A device must internally provide a hold time of at least 300ns for the SDA signal in order to bridge the undefined region of the falling
edge of SCL.
TIMING DIAGRAMS
START and STOP Timing
SCL
SDA
High-voltage write cycle time (store instructions) 5 10 ms
Wiper response time after the third (last) power supply is stable 10 µs Wiper response time after instruction issued (all load instructions) 10 µs Wiper response time from an active SCL/SCK edge (increment/decrement instruction) 10 µs
(START) (STOP)
t
F
t
SU:STO
t
F
t
SU:STA
t
HD:STA
t
R
t
R
Input Timing
SCL
SDA
Output Timing
SCL
SDA
t
CYC
t
SU:DAT
t
HIGH
t
LOW
t
HD:DAT
t
AA
t
DH
t
BUF
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XDCP Timing (for All Load Instructions)
SCL
X9428
(STOP)
SDA
V
W/RW
XDCP Timing (for Increment/Decrement Instruction)
SCL
Wiper Register Address Inc/Dec Inc/Dec
V
W/RW
SDA
Write Protect and Device Address Pins Timing
LSB
t
WRL
t
WRID
SCL
SDA
WP
A0, A2, A3
15
(START) (STOP)
...
(Any Instruction)
... ...
t
SU:WPA
t
HD:WPA
FN8197.0
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APPLICATIONS INFORMATION
Basic Configurations of Electronic Potentiometers
V
R
VW/R
W
Three terminal Potentiometer; Variable voltage divider
Application Circuits
Noninverting Amplifier Voltage Regulator
X9428
+V
R
I
Two terminal Variable Resistor; Variable current
V
S
VO = (1+R2/R1)V
Offset Voltage Adjustment Comparator with Hysteresis
V
S
10k
R
R
1
100k
-12V+12V
+ –
R
1
S
– +
TL072
10k10k
V
O
2
R
2
V
O
IN
VO (REG) = 1.25V (1+R2/R1)+I
V
S
VUL = {R1/(R1+R2)} VO(max) V
= {R1/(R1+R2)} VO(min)
LL
317
I
adj
R
2
– +
}
}
R
R
2
1
R
1
adj R2
VO (REG)V
V
O
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Application Circuits (continued)
Attenuator Filter
R
1
V
S
V
R
3
R
VO = G V
-1/2 G +1/2
Inverting Amplifier Equivalent L-R Circuit
R
R
1
S
}
4
All RS = 10k
S
2
}
– +
– +
X9428
C
V
R
2
V
O
V
O
S
R
G
O
fc = 1/(2πRC)
C
1
V
S
R
1
= 1 + R2/R
+ –
R
1
R
2
+ –
V
O
2
VO = G V G = - R2/R
R
Z
S
1
Function Generator
R
– +
R
}
A
R
}
B
frequency R1, R2, C amplitude R
2
, R
A
IN
ZIN = R2 + s R2 (R1 + R3) C1 = R2 + s Leq (R
R
1
B
1
– +
1
R
3
+ R3) >> R
C
2
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PACKAGING INFORMATION
X9428
14-Lead Plastic, TSSOP, Package Type V
.025 (.65) BSC
0° - 8°
.0075 (.19) .0118 (.30)
.193 (4.9) .200 (5.1)
.019 (.50) .029 (.75)
Detail A (20X)
.169 (4.3) .177 (4.5)
.047 (1.20)
.002 (.05) .006 (.15)
.010 (.25)
Gage Plane
Seating Plane
.252 (6.4) BSC
.031 (.80)
.041 (1.05)
See Detail “A”
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
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PACKAGING INFORMATION
16-Lead Plastic SOIC (300 Mil Body) Package Type S
X9428
PIN 1 INDEX
(4X) 7°
0.050 (1.27)
PIN 1
0.010 (0.25)
0.020 (0.50)
X 45°
0.014 (0.35)
0.020 (0.51)
0.403 (10.2 )
0.413 ( 10.5)
0.290 (7.37)
0.299 (7.60)
0.003 (0.10)
0.012 (0.30)
0.050" Typical
0.393 (10.00)
0.420 (10.65)
0.092 (2.35)
0.105 (2.65)
0° - 8 °
0.0075 (0.19)
0.010 (0.25)
0.015 (0.40)
0.050 (1.27)
0.420"
FOOTPRINT
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
19
0.030" Typical 16 Places
0.050"
Typical
FN8197.0
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Ordering Information
X9428
X9428 P T V
Device
Y
VCC Limits
Blank = 5V ±10%
-2.7 = 2.7 to 5.5V
Temperature Range
Blank = Commercial = 0°C to +70°C I = Industrial = -40°C to +85°C
Package
P = 16-Lead Plastic DIP* S = 16-Lead SOIC V = 14-Lead TSSOP
Potentiometer Organization
Y = 2k W = 10k
*Note: P package only available as X9428WP16I-2.7 for prototyping. Other resistor values not available in package.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
20
FN8197.0
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