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參數(shù)資料
| 型號： | CAT5116ZI-T3 |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC POT DPP 100TAP LOG U/D 8MSOP |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 系列： | DPP |
| 接片： | 100 |
| 電阻（歐姆）： | 32k |
| 電路數(shù)： | 1 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)值 300 ppm/°C |
| 存儲器類型： | 非易失 |
| 接口： | 3 線串行（芯片選擇，遞增，增/減） |
| 電源電壓： | 2.5 V ~ 6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
CAT5116
http://onsemi.com
2
Functional Diagram
Figure 1. General
Figure 2. Block Diagram
Figure 3. Potentiometer
Schematic
165
11
10.4
LOG
TAPER
Control
and
Memory
Power On
GND
Interface
&
Wiper
Control
EEPROM
GND
Potentiometer
R = 32 k
VCC
RH
RW
RL
Recall
U/D
INC
CS
RL
RW
RH
VCC
U/D
INC
CS
RW
RH
RL
RTOT = 32 kW
Pin Description
INC: Increment Control Input
The INC input moves the wiper in the up or down direction
determined by the condition of the U/D input.
U/D: Up/Down Control Input
The U/D input controls the direction of the wiper movement.
When in a high state and CS is low, any high-to-low
transition on INC will cause the wiper to move one
increment toward the RH terminal. When in a low state and
CS is low, any high-to-low transition on INC will cause the
wiper to move one increment towards the RL terminal.
RH: High End Potentiometer Terminal
RH is the high end terminal of the potentiometer. It is not
required that this terminal be connected to a potential greater
than the RL terminal. Voltage applied to the RH terminal
cannot exceed the supply voltage, VCC or go below ground,
GND.
RW: Wiper Potentiometer Terminal
RW is the wiper terminal of the potentiometer. Its position on
the resistor array is controlled by the control inputs, INC,
U/D and CS. Voltage applied to the RW terminal cannot
exceed the supply voltage, VCC or go below ground, GND.
RL: Low End Potentiometer Terminal
RL is the low end terminal of the potentiometer. It is not
required that this terminal be connected to a potential less
than the RH terminal. Voltage applied to the RL terminal
cannot exceed the supply voltage, VCC or go below ground,
GND. RL and RH are electrically interchangeable.
CS: Chip Select
The chip select input is used to activate the control input of
the CAT5116 and is active low. When in a high state, activity
on the INC and U/D inputs will not affect or change the
position of the wiper.
Device Operation
The CAT5116 operates like a digitally controlled
potentiometer with RH and RL equivalent to the high and low
terminals and RW equivalent to the mechanical
potentiometer’s wiper. There are 100 tap positions including
the resistor end points, RH and RL. There are 99 resistor
elements connected in series between the RH and RL
terminals. The wiper terminal is connected to one of the 100
taps and controlled by three inputs, INC, U/D and CS. These
inputs control a seven-bit up/down counter whose output is
decoded to select the wiper position. The selected wiper
position can be stored in nonvolatile memory using the INC
and CS inputs.
With CS set LOW the CAT5116 is selected and will
respond to the U/D and INC inputs. HIGH to LOW
transitions on INC will increment or decrement the wiper
(depending on the state of the U/D input and seven-bit
counter). The wiper, when at either fixed terminal, acts like
its mechanical equivalent and does not move beyond the last
position. The value of the counter is stored in nonvolatile
memory whenever CS transitions HIGH while the INC input
is also HIGH. When the CAT5116 is powered-down, the last
stored wiper counter position is maintained in the
nonvolatile memory. When power is restored, the contents
of the memory are recalled and the counter is set to the value
stored.
With INC set low, the CAT5116 may be deselected and
powered down without storing the current wiper position in
nonvolatile memory. This allows the system to always
power up to a preset value stored in nonvolatile memory.
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