CAT5138SDI-10GT3 [ONSEMI]
数字电位计 (POT)，128 抽头，I2C 接口;
| 型号： | CAT5138SDI-10GT3 |
| 厂家： | 
ONSEMI |
| 描述： | 数字电位计 (POT)，128 抽头，I2C 接口 光电二极管 转换器 数字电位计 |
| 文件： | 总11页 (文件大小：245K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CAT5136, CAT5137,
CAT5138
Digital Potentiometers (POTs)
with 128 Taps and
I2C Interface
http://onsemi.com
Description
CAT5136, CAT5137, and CAT5138 are a family of digital POTs
operating like mechanical potentiometers in various configurations.
The tap points between the 127 equal resistive elements are connected
to the wiper output via CMOS switches. The switches are controlled
SC−70
SD SUFFIX
CASE 419AD
2
by a 7-bit Wiper Control Register (WCR) via the I C serial bus.
CAT5136 is configured as a variable resistor. CAT5137 and CAT5138
are resistive voltage dividers, with one terminal of the potentiometer
connected to GND. CAT5137 and CAT5138 have different device IDs,
2
PIN CONNECTIONS
(for low pin count devices)
which makes it possible to use both on the same I C bus. Upon
power-up, the WCR is set to mid-scale (1000000).
VDD
GND
SCL
1
2
3
RL
6
5
4
Features
Single Linear Digital Potentiometer with 128 Taps
End-to-End Resistance of 10 kW, 50 kW and 100 kW
RW
SDA
2
I C Interface
Wiper goes to Midscale at Power-up
CAT5136
Digital Supply Range (V ): 2.7 V to 5.5 V
Low Standby Current
Industrial Temperature Range: −40C to +85C
6-pin SC−70 Package
DD
VDD
GND
SCL
1
2
3
6
5
4
RH
RW
SDA
These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
CAT5137
CAT5138
Typical Applications
(Top Views)
LCD Screen Adjustment
Volume Control
See detailed pin function descriptions on page 2.
Mechanical Potentiometer Replacement
Gain Adjustment
Line Impedance Matching
VCOM Setting Adjustments
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
Semiconductor Components Industries, LLC, 2013
1
Publication Order Number:
July, 2013 − Rev. 1
CAT5136/D
CAT5136, CAT5137, CAT5138
VDD
VDD
RH
2
2
I C
I C
SCL
SDA
SCL
SDA
Interface
Interface
and
Control
and
RW
RW
RL
Control
Power On
Midscale
Power On
Midscale
GND
GND
(CAT5136)
(CAT5137, CAT5138)
Figure 1. Block Diagram
Table 1. PIN FUNCTION DESCRIPTION
Pin No.
CAT5136
CAT5137/CAT5138
Pin Name
VDD
Description
1
2
3
1
2
3
Digital Supply Voltage (2.7 V to 5.5 V)
GND
Ground
2
SCL
Serial Bus Clock input for the I C Serial Bus. This clock is used to clock all data
transfers into and out of the CAT5136−8
4
4
SDA
Serial Data Input/Output − Bidirectional Serial Data pin used to transfer data into
and out of the CAT5136−8. This is an Open-Drain I/O and can be wire OR’d with
other Open-Drain (or Open Collector) I/Os.
5
6
−
5
−
6
RW
RL
Wiper Terminal for the potentiometer
Low Reference Terminal for the potentiometer
High Reference Terminal for the potentiometer
RH
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Range
Unit
C
C
V
Temperature Under Bias
−55 to +125
−65 to 150
Storage Temperature Range
T
STG
Voltage on any SDA, SCL, A0 & A1 pins with respect to Ground (Note 1)
Voltage on RH, RL & RW pins with respect to Ground
−0.3 to V + 0.3
DD
−0.3 to V + 0.3
V
DD
V
with respect to Ground
−0.3 to +6
6
V
DD
Wiper Current (10 sec)
mA
C
Lead Soldering temperature (10 sec)
+300
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Latch-up protection is provided for stresses up to 100 mA on address and data pins from −0.3 V to V +0.3 V.
DD
Table 3. RECOMMENDED OPERATION CONDITIONS
Parameter
Symbol
Value
Unit
V
Digital Supply Voltage
V
DD
+2.7 to +5.5
−40 to +85
Operating Temperature Range
C
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2
CAT5136, CAT5137, CAT5138
Table 4. POTENTIOMETERS CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Limits
Min
Typ
10
Max
Parameter
Symbol
Test Conditions
Units
kW
kW
kW
%
Potentiometer Resistance (10 kW)
Potentiometer Resistance (50 kW)
Potentiometer Resistance (100 kW)
Potentiometer Resistance Tolerance
Power Rating
R
R
R
POT
POT
POT
50
100
R
TOL
20
50
25C
mW
mA
W
Wiper Current
I
W
3
Wiper Resistance
R
W
V
DD
= 3.3 V
85
200
Voltage on R , R or R
V
TERM
GND = 0 V; V = 2.7 V to +5.5 V
GND
V
DD
V
W
H
L
DD
Resolution
RES
INL
0.78
%
Integral Non-Linearity (Note 3)
Differential Non-Linearity (Note 4)
Resistor Integral Non-Linearity
Resistor Differential Non-Linearity
V
− V
1
LSB
(Note 5)
W(n)(actual)
W(n)(expected)
(Notes 6, 7)
DNL
V
R
R
− [V
+LSB] (Notes 6, 7)
1
LSB
(Note 5)
W(n+1)
W(n)
R
− n*LSB (Notes 6, 8)
2
1
LSB
(Note 5)
INL
n
n
R
− [R
+ LSB] (Notes 6, 8)
LSB
(Note 5)
DNL
n−1
Temperature Coefficient of R
T
(Note 2)
(Note 2)
(Note 2)
300
ppm/C
ppm/C
pF
POT
CRPOT
Ratiometric Temperature Coefficient
Potentiometer Capacitances
Frequency Response
T
30
CRatio
C /C /C
H
10/10/25
0.4
L
W
fc
R
MHz
POT
2. This parameter is tested initially and after a design or process change that affects the parameter.
3. Integral Non-Linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as
a potentiometer.
4. Differential Non-Linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a
potentiometer.
5. LSB = (R
− R )/127; where R
and R are the highest and lowest measured values on the wiper terminal.
HM LM
HM
LM
6. n = 1, 2, ..., 127
7. V @ R ; V measured @ R with no load.
DD
H
L
W
W
8. Rw and R in the range of 0 V and V
.
DD
Table 5. D.C. ELECTRICAL CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Parameter
Symbol
Test Conditions
Min
Max
Units
Power Supply Current
(Write/Read)
I
F
= 400 kHz, SDA Open,
= 5.5 V, Input = GND
200
mA
DD
SCL
DD
V
V
V
V
Standby Current
I
= GND or V , SDA = V
DD
0.5
1
mA
mA
mA
V
SB(VDD)
IN
DD
Input Leakage Current
Output Leakage Current
Input Low Voltage
I
= GND to V
DD
−1
−1
LI
IN
I
= GND to V
DD
1
LO
OUT
V
−0.3
V
x 0.3
IL
IH
DD
Input High Voltage
V
V
x 0.7
V
+ 0.3
V
DD
DD
Output Low Voltage (V = 3.0 V)
V
OL
I = 3 mA
OL
0.4
V
DD
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3
CAT5136, CAT5137, CAT5138
Table 6. A.C. CHARACTERISTICS
Parameter (see Figure 6)
Symbol
Min
Typ
Max
400
50
Units
kHz
ns
Clock Frequency
F
SCL
Noise Suppression Time Constant at SCL & SDA Inputs
SCL Low to SDA Data Out and ACK Out
Time the bus must be free before a new transmission can start
Start Condition Hold Time
T (Note 9)
I
t
AA
1
ms
t
(Note 9)
1.2
0.6
1.2
0.6
0.6
100
0
ms
BUF
t
ms
HD:STA
Clock Low Period
t
ms
LOW
Clock High Period
t
ms
HIGH
Start Condition Setup Time (for a Repeated Start Condition)
Data In Setup Time
t
ms
SU:STA
SU:DAT
t
ns
Data in Hold Time
t
ms
HD:DAT
SDA and SCL Rise Time
t
R
(Note 9)
0.3
ms
SDA and SCL Fall Time
t (Note 9)
F
300
ns
Stop Conditions Setup Time
t
0.6
ms
SU:STO
Data Out Hold Time
t
100
ns
DH
9. This parameter is tested initially and after a design or process change that affects the parameter.
Table 7. CAPACITANCE (T = 25C, f = 1.0 MHz, V = 5.0 V)
A
DD
Parameter
Input/Output Capacitance (SDA, SDC)
Symbol
Test Conditions
= 0 V (Note 10)
I/O
Min
Typ
Max
Unit
C
V
10
pF
I/O
10.This parameter is tested initially and after a design or process change that affects the parameter.
Table 8. POWER-UP TIMING (Notes 11, 12)
Symbol
Parameter
Min
Max
Units
ms
t
Power-up to Read Operation
Power-up to Write Operation
1
1
PUR
t
ms
PUW
11. This parameter is tested initially and after a design or process change that affects the parameter.
12.t and t are the delays required from the time V is stable until the specified operation can be initiated.
PUR
PUW
DD
Table 9. WIPER TIMING
Symbol
Parameter
Min
5
Max
10
Units
ms
t
Wiper Response Time After Power Supply Stable
Wiper Response Time After Instruction Issued
WRPO
t
5
10
ms
WRL
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CAT5136, CAT5137, CAT5138
TYPICAL PERFORMANCE CHARACTERISTICS
60
50
40
30
20
90
−40C
80
V
V
= 2.7 V
= 5.5 V
CC
CC
25C
70
90C
60
50
40
30
20
125C
Rheostat Configuration
10
0
T = +25C, R
= 50 kW
A
POT
10
0
0
16
32
48
64
80
96
112
128
2
3
4
5
6
TAP POSITION
V
(V)
CC
Figure 2. Resistance between RW and RL
Figure 3. Power Supply Current
1.0
0.8
1.0
0.8
Potentiometer Configuration
Potentiometer Configuration
T = +25C, R
= 10 kW
A
POT
0.6
0.6
0.4
0.4
0.2
0.2
0
0
−0.2
−0.4
−0.6
−0.2
−0.4
−0.6
V
V
= 2.7 V
= 5.5 V
V
V
= 2.7 V
= 5.5 V
CC
CC
CC
CC
−0.8
−1.0
−0.8
−1.0
0
16
32
48
64
80
96
112
128
0
16
32
48
64
80
96
112 128
TAP POSITION
TAP POSITION
Figure 4. Integral Non−Linearity
Figure 5. Differential Non−Linearity
t
t
F
t
R
HIGH
t
t
LOW
LOW
SCL
t
t
HD:DAT
SU:STA
t
t
t
SU:DAT
HD:STA
SU:STO
SDA IN
t
BUF
t
AA
t
DH
SDA OUT
Figure 6. Bus Timing
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CAT5136, CAT5137, CAT5138
SERIAL BUS PROTOCOL
2
STOP Condition
The following defines the features of the I C bus protocol:
1. Data transfer may be initiated only when the bus is
not busy.
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must end
with a STOP condition (see Figure 7).
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.
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 (see Figure 8).
The CAT513x 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.
When the CAT513x 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
CAT513x 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 CAT513x will be considered a slave device
in all applications.
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 CAT513x monitors the SDA and
SCL lines and will not respond until this condition is met
(see Figure 7).
SDA
SCL
START CONDITION
STOP CONDITION
Figure 7. Start/Stop Condition
BUS RELEASE DELAY (TRANSMITTER)
BUS RELEASE DELAY (RECEIVER)
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
ACK SETUP ( t
)
SU:DAT
START
ACK DELAY ( t
)
AA
Figure 8. Acknowledge Condition
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CAT5136, CAT5137, CAT5138
DEVICE DESCRIPTION
Slave Address Instruction Byte Description
Only the device with slave address matching the input
byte will be accessed by the master.
The last bit is the READ/WRITE bit and determines the
function to be performed. If it is a “1” a read command is
initiated and if it is a “0” a write is initiated.
After the Master sends a START condition and the slave
address byte, the CAT513x monitors the bus and responds
with an acknowledge when its address matches the
transmitted slave address.
The first byte sent to the CAT513x from the master
processor is called the Slave Address Byte. The most
significant seven bits of the slave address are a device type
identifier. For CAT5136 and CAT5137 these bits are fixed
at 0101110. For CAT5138, they are 0111110. This allows
both CAT5137 and CAT5138, which are functionally
identical, to reside on the same bus (refer to Table 10).
Table 10. BYTE 1 SLAVE ADDRESS AND INSTRUCTION BYTE
Device Type Identifier
ID6
ID5
1
ID4
0
ID3
1
ID2
1
ID1
1
ID0
0
Device
CAT5136
CAT5137
CAT5138
Read/Write
R/W
0
0
0
1
0
1
1
1
0
R/W
1
1
1
1
1
0
R/W
(MSB)
(LSB)
Wiper Control Register (WCR) Description
A write operation (see Table 11) requires a Start condition,
The CAT513x contains a 7-bit volatile Wiper Control
Register which is decoded to select one of the 128 switches
along its resistor array. The Wiper Control Register loses its
contents when the CAT513x is powered-down. At
power-up, the register is loaded with the midscale value 40h.
The contents of the WCR may be read or changed directly
followed by a valid slave address byte, a valid address byte
00h, a data byte and a STOP condition. After each of the
three bytes, the CAT513x responds with an acknowledge.
After the third byte, the data is written to the Wiper Control
Register, and the wiper changes position accordingly.
A read operation (see Table 12) requires a Start condition,
followed by a valid slave address byte for write, a valid
address byte 00h, a second START and a second slave
address byte for read. After each of the three bytes, the
CAT513x responds with an acknowledge and then the
device transmits the data byte. The master terminates the
read operation by issuing a STOP condition following the
last bit of Data byte.
2
by the host using a READ/WRITE command on the I C bus
(see Table 1 to access WCR). Since the CAT513x will only
make use of the 7 LSB bits, the first data bit, or MSB, is
ignored on write instructions and will always come back as
a “0” on read commands.
Table 11. WRITE OPERATION
CAT5136 and CAT5137
1st byte
2nd byte
3rd byte
SLAVE
ADDRESS
ADDRESS
BYTE
DATA BYTE IN
S
S
0 1 0 1 1 1 0
0
0
A 0 0 0 0 0 0 0 0 A
X
X
D6 D5 D4 D3 D2 D1 D0
A
A
P
P
CAT5138
1st byte
2nd byte
3rd byte
SLAVE
ADDRESS
ADDRESS
BYTE
DATA BYTE IN
0 1 1 1 1 1 0
A 0 0 0 0 0 0 0 0 A
D6 D5 D4 D3 D2 D1 D0
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CAT5136, CAT5137, CAT5138
Table 12. READ OPERATION
CAT5136 and CAT5137
1st byte
2nd byte
3rd byte
4th byte
SLAVE
ADDRESS
ADDRESS
BYTE
SLAVE ADDRESS
R
1
OUTPUT DATA BYTE
S
S
0 1 0 1 1 1 0
0
0
A 0 0 0 0 0 0 0 0 A
S
S
0
0
1
0
1
1
1
0
0
A 0 D6 D5 D4 D3 D2 D1 D0 NA
P
P
CAT5138
3rd byte
1st byte
2nd byte
4th byte
SLAVE
ADDRESS
ADDRESS
BYTE
SLAVE ADDRESS
R
1
OUTPUT DATA BYTE
0 1 1 1 1 1 0
A 0 0 0 0 0 0 0 0 A
1
1
1
1
1
A 0 D6 D5 D4 D3 D2 D1 D0 NA
POTENTIOMETER OPERATION
CAT5136, CAT5137, CAT5138 are a family of a
128-position, digital controlled potentiometers. When V
wiper register which is decoded to select one of these 128
contact points.
DD
is applied, the device automatically turns on at the mid-point
wiper location (64).
At power-down, it is recommended to turn-off first the
signals on RH, RW and RL, followed by VDD, in order to
avoid unexpected transitions of the wiper and uncontrolled
current overload of the potentiometer.
The end-to-end nominal resistance of the potentiometer
has 128 contact points linearly distributed across the total
resistor. Each of these contact points is addressed by the 7 bit
Each contact point generates a linear resistive value
between the 0 position and the 127 position. These values
can be determined by dividing the end-to-end value of the
potentiometer by 127. In the case of the 50 kW
potentiometer ~390 W is the resistance between each wiper
position. However in addition to the ~390 W for each
resistive segment of the potentiometer, a wiper resistance
offset must be considered. Table 13 shows the effect of this
value and how it would appear on the wiper terminal.
Table 13. POTENTIOMETER RESISTANCE AND WIPER RESISTANCE OFFSET EFFECTS
Position
00
Typical RW to RL Resistance for 50 kW Digital Potentiometer
70 W or
460 W or
0 W + 70 W
01
390 W + 70 W
24,800 W + 70 W
50,000 W + 70 W
63
24,870 W or
50,070 W or
127
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CAT5136, CAT5137, CAT5138
Table 14. ORDERING INFORMATION
Specific
Device Order
Package
Type
Resistance
Lead
Finish
Device
†
Number
(kW)
Marking
Temperature Range
Shipping
CAT5136SDI−50GT3
P64
P72
P75
P82
SC−70−6
SC−70−6
SC−70−6
SC−70−6
I = Industrial
50
NiPdAu
NiPdAu
NiPdAu
NiPdAu
3,000 / Tape & Reel
3,000 / Tape & Reel
3,000 / Tape & Reel
3,000 / Tape & Reel
(−40C to +85C)
CAT5137SDI−10GT3
(Note 14)
I = Industrial
(−40C to +85C)
10
100
10
CAT5137SDI−00GT3
I = Industrial
(−40C to +85C)
CAT5138SDI−10GT3
I = Industrial
(−40C to +85C)
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
13.For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device
Nomenclature document, TND310/D, available at www.onsemi.com
14.Contact factory for availability.
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MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
SC−88 (SC−70 6 Lead), 1.25x2
CASE 419AD
ISSUE A
DATE 07 JUL 2010
1
SYMBOL
MIN
NOM
MAX
D
0.80
A
1.10
e
e
A1
A2
0.00
0.80
0.10
1.00
b
c
0.15
0.10
1.80
1.80
1.15
0.30
0.18
2.20
2.40
1.35
D
2.00
2.10
E1
E
E
E1
e
1.25
0.65 BSC
0.36
L
0.26
0.46
L1
L2
0.42 REF
0.15 BSC
TOP VIEW
0º
4º
8º
θ
10º
θ1
q1
A2
A1
A
q
L
b
L1
q1
c
L2
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-203.
Electronic versions are uncontrolled except when accessed directly from the Document Repository.
Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.
DOCUMENT NUMBER:
DESCRIPTION:
98AON34266E
SC−88 (SC−70 6 LEAD), 1.25X2
PAGE 1 OF 1
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相关型号：
SI9130DB
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