DS1267 반도체 회로 부품 판매점
Dual Digital Potentiometer Chip
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 Dallas Semiconducotr |
www.dalsemi.com
DS1267
Dual Digital Potentiometer Chip
FEATURES
§ Ultra-low power consumption, quiet,
pumpless design
§ Two digitally controlled, 256-position
potentiometers
§ Serial port provides means for setting and
reading both potentiometers
§ Resistors can be connected in series to
provide increased total resistance
§ 14-pin DIP, 16-pin SOIC, 20-pin TSSOP
packages
§ Resistive elements are temperature
compensated to ±0.3 LSB relative linearity
§ Standard resistance values:
– DS1267-10 ~ 10 kΩ
– DS1267-50 ~ 50 kΩ
– DS1267-100 ~ 100 kΩ
§ Operating Temperature Range:
– Industrial: -40°C to +85°C
PIN DESCRIPTIONS
L0, L1 - Low End of Resistor
H0, H1 - High End of Resistor
W0, W1 - Wiper Terminal of Resistor
VB
SOUT
- Substrate Bias Voltage
- Stacked Configuration Output
RST - Serial Port Reset Input
DQ - Serial Port Data Input
CLK - Serial Port Clock Input
COUT - Cascade Port Output
VCC - +5 Volt Supply
GND - Ground
NC - No Internal Connection
PIN ASSIGNMENT
VB
NC
H1
L1
W1
RST
CLK
GND
1
2
3
4
5
6
7
8
16 VCC
15 NC
14 SOUT
13 W0
12 H0
11 L0
10 COUT
9 DQ
16-Pin SOIC (300-mil)
See Mech. Drawings Section
VB
H1
L1
W1
RST
CLK
GND
1
2
3
4
5
6
7
14 VCC
13 SOUT
12 W0
11 H0
10 L0
9 COUT
8 DQ
14-Pin DIP (300-mil)
See Mech. Drawings Section
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VB 1
NC 2
H1 3
20 VCC
19 NC
18 NC
L1 4
W1 5
17 SOUT
16 W0
RST
6
15 H0
CLK
NC
NC
GND
7
8
9
10
14 L0
13 COUT
12 NC
11 DQ
20-Pin TSSOP (173-mil)
102199
DS1267
DESCRIPTION
The DS1267 Dual Digital Potentiometer Chip consists of two digitally controlled, solid-state
potentiometers. Each potentiometer is composed of 256 resistive sections. Between each resistive section
and both ends of the potentiometer are tap points which are accessible to the wiper. The position of the
wiper on the resistive array is set by an 8-bit value that controls which tap point is connected to the wiper
output. Communication and control of the device are accomplished via a 3-wire serial port interface.
This interface allows the device wiper position to be read or written.
Both potentiometers can be connected in series (or stacked) for an increased total resistance with the
same resolution. For multiple-device, single-processor environments, the DS1267 can be cascaded or
daisy-chained. This feature provides for control of multiple devices over a single 3-wire bus.
The DS1267 is offered in three standard resistance values which include 10, 50, and 100-kohm versions.
Available packages for the device include a 14-pin DIP, 16-pin SOIC, and 20-pin TSSOP.
OPERATION
The DS1267 contains two 256-position potentiometers whose wiper positions are set by an 8-bit value.
These two 8-bit values are written to a 17-bit I/O shift register that is used to store the two wiper positions
and the stack select bit when the device is powered. A block diagram of the DS1267 is presented in
Figure 1.
Communication and control of the DS1267 are accomplished through a 3-wire serial port interface that
drives an internal control logic unit. The 3-wire serial interface consists of the three input signals: RST ,
CLK, and DQ.
The RST control signal is used to enable the 3-wire serial port operation of the device. The chip is
selected when RST is high; RST must be high to begin any communication to the DS1267. The CLK
signal input is used to provide timing synchronization for data input and output. The DQ signal line is
used to transmit potentiometer wiper settings and the stack select bit configuration to the 17-bit I/O shift
register of the DS1267.
Figure 9(a) presents the 3-wire serial port protocol. As shown, the 3-wire port is inactive when the RST
signal input is low. Communication with the DS1267 requires the transition of the RST input from a low
state to a high state. Once the 3-wire port has been activated, data is entered into the part on the low to
high transition of the CLK signal inputs. Three-wire serial timing requirements are provided in the timing
diagrams of Figure 9(b)-(c).
Data written to the DS1267 over the 3-wire serial interface is stored in the 17-bit I/O shift register (see
Figure 2). The 17-bit I/O shift register contains both 8-bit potentiometer wiper position values and the
stack select bit. The composition of the I/O shift register is presented in Figure 2. Bit 0 of the I/O shift
register contains the stack select bit, which will be discussed in the section entitled "Stacked
Configuration." Bits 1 through 8 of the I/O shift register contain the potentiometer-1 wiper position value.
Bit 1 contains the MSB of the wiper setting for potentiometer-1 and bit 8 the LSB for the wiper setting.
Bits 9 through 16 of the I/O shift register contain the value of the potentiometer-0 wiper position, with the
MSB for the wiper position occupying bit 9 and the LSB bit 16.
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102199
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
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IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
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전력반도체 문의 : 010-3582-2743
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