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DS1804 の電気的特性と機能

DS1804のメーカーはMaxim Integratedです、この部品の機能は「Nonvolatile Trimmer Potentiometer」です。


製品の詳細 ( Datasheet PDF )

部品番号 DS1804
部品説明 Nonvolatile Trimmer Potentiometer
メーカ Maxim Integrated
ロゴ Maxim Integrated ロゴ 




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DS1804 Datasheet, DS1804 PDF,ピン配置, 機能
19-5876; Rev 6/11
DS1804
Nonvolatile Trimmer Potentiometer
FEATURES
Single 100-Position Taper Potentiometer
Nonvolatile (NV) On-Demand Wiper
Storage
Operates from 3V or 5V Supplies
Up/Down, Increment-Controlled Interface
Available in 8-Pin (300 mils) DIP, 8-Pin
(150 mils) SO, and 8-Pin (118 mils) µSOP
-40°C to +85°C Operating Temperature
Range
Standard Resistance Values:
DS1804-010: 10k
DS1804-050: 50k
DS1804-100: 100k
PIN ASSIGNMENT
INC 1
U/D 2
H3
GND 4
8 VCC
7 CS
6L
5W
DIP (300 mils)
SO (150 mils)
μSOP (118 mils)
PIN DESCRIPTION
H - High-Terminal of Potentiometer
L - Low-Terminal of Potentiometer
W - Wiper of Potentiometer
VCC - 3V or 5V Power Supply
CS - Chip Select
U/ D - Up/Down Control
INC - Increment/Decrement Wiper Control
GND
- Ground
DESCRIPTION
The DS1804 NV trimmer potentiometer is a nonvolatile digital potentiometer that has 100 positions. The
device provides an ideal method for low-cost trimming applications using a CPU or manual control input
with minimal external circuitry. Wiper position of the DS1804 can be stored in EEPROM memory on
demand. The device’s wiper position is manipulated by a three-terminal port that provides an increment/
decrement counter controlled interface. This port consists of the control inputs CS , INC , and U/ D . The
DS1804 is available in three resistor grades, which include a 10k, 50k, and 100k. The device is
provided in an industrial temperature grade. Additionally, the DS1804 will operate from 3V or 5V
supplies and is ideal for portable application requirements. Three packaging options are available and
include the 8-pin (300 mils) DIP, 8-pin (150 mils) SO, and 8-pin (118 mils) μSOP.
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DS1804 pdf, ピン配列
DS1804 BLOCK DIAGRAM Figure 1
DS1804
POWER-UP/POWER-DOWN CONDITIONS
On power-up, the DS1804 will load the value of EEPROM memory into the wiper position register (or 1
of 100 decoder). The value of this register can then be set to another wiper position if desired, by using
the three-terminal control port. On power-up, wiper position will be loaded within a maximum time
period of 500µs once the power-supply is stable. Additionally, the three-terminal interface port will be
active after 50ms.
On power-down, the wiper position register data will be lost. On the next device power-up, the value of
EEPROM memory will be loaded into the wiper position register.
On shipment from the factory, Maxim Integrated Products does not guarantee a specified EEPROM
memory value. This value should be set by the customer as needed.
NONVOLATILE WIPER STORAGE
Wiper position of the DS1804 can be stored using the INC and CS inputs. Storage of the wiper position
takes place whenever the CS input transitions from low-to-high while the INC is high. Once this
condition has occurred the value of the current wiper position will be written to EEPROM memory.
The DS1804 is specified to accept 50,000 writes to EEPROM over 0°C to 70ºC before a wear-out
condition. After wear-out the DS1804 will still function and wiper position can be changed during
powered conditions using the three-terminal control port. However, on power-up the wiper-position will
be indeterminate.
ONE-TIME PROGRAMMABILITY (OTP)
The DS1804 can be easily used as an OTP device. The user of the DS1804 can trim the desired value of
the wiper position and set this position for storage as described above. Any activity through the three-
terminal port can then be prevented by connecting the CS input pin to VCC. Also, an OTP application
does not adversely affect the number of times EEPROM is written, since EEPROM will only be loaded
and not written during a power-up or power-down condition.
On power-up, the DS1804 will load the current value of EEPROM memory into the wiper position
register.
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DS1804 電子部品, 半導体
NOTES:
1) All voltages are referenced to ground.
DS1804
2) Valid for VCC = 5V only.
3) Resistor input voltages cannot go below ground or exceed VCC by the amounts as shown in the table.
4) Maximum current specifications are based on the clock rate of INC input. This specification
represents the current required when changing the wiper position.
5) Standby current levels apply when all inputs are driven to appropriate supply levels. CS , INC , U/ D =
VCC.
6) Wiper load time is specified as the time required for the DS1804 to load the wiper position with the
contents of nonvolatile memory once VCC has reached a stable operating voltage equal to or greater
than 2.7V.
7) The DS1804 is available in three resistor values. These include the DS1804-010, 10k; the DS1804-
050, 50k; and the DS1804-100, 100k.
8) Valid at TA = +25°C only.
9) Absolute linearity is used to compare measured wiper voltage versus expected wiper voltage as
determined by wiper position. The DS1804 is specified to provide an absolute linearity of ±0.60 LSB.
10) Relative linearity is used to determined the change in voltage between successive tap positions. The
DS1804 is specified to provide a relative linearity specification of ±0.25 LSB.
11) -3dB cutoff frequency characteristics for the DS1804 depend on potentiometer total resistance.
DS1804-010, 1MHz; DS1804-050, 200kHz; and DS1804-100, 100kHz.
12) Capacitance values apply at TA = +25°C.
13) See Figure 2.
14) Power-up time is specified as the time required before the three-terminal control becomes active after
a stable power supply level has been reached.
15) At VCC = 2.7V, VIL = 0.8V.
16) The INC low to CS inactive is specified to be 50ns minimum. This is the transition condition which
allows the DS1804 three-terminal port to become inactive without writing the EEPROM memory of
the part.
17) Wiper Storage Time, tWST, is the time require for the DS1804 to write EEPROM memory for storage
of a new wiper position. The maximum time required to accomplish this task is specified at 10ms.
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