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參數(shù)資料
| 型號： | MAX5479EUD+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 0K |
| 描述： | IC POT DGTL DUAL 256-TAP 14TSSOP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 接片： | 256 |
| 電阻（歐姆）： | 100k |
| 電路數(shù)： | 2 |
| 溫度系數(shù)： | 標準值 70 ppm/°C |
| 存儲器類型： | 非易失 |
| 接口： | I²C（設(shè)備位址） |
| 電源電壓： | 2.7 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 帶卷 (TR) |
MAX5477/MAX5478/MAX5479
Dual, 256-Tap, Nonvolatile, I2C-Interface,
Digital Potentiometers
10
______________________________________________________________________________________
Detailed Description
The MAX5477/MAX5478/MAX5479 contain two resistor
arrays with 255 elements in each array. The MAX5477
has a total end-to-end resistance of 10k
, the
MAX5478 has an end-to-end resistance of 50k
, and
the MAX5479 has an end-to-end resistance of 100k
.
The MAX5477/MAX5478/MAX5479 provide access to
the high, low, and wiper terminals for a standard volt-
age-divider configuration. Connect H_, L_, and W_ in
any desired configuration as long as their voltages
remain between GND and VDD.
A simple 2-wire I2C-compatible serial interface moves
the wiper among the 256 tap points (Figure 2). A non-
volatile memory stores the wiper position and recalls
the stored wiper position upon power-up. The non-
volatile memory is guaranteed for 50 years for wiper
data retention and up to 200,000 wiper store cycles.
Analog Circuitry
The MAX5477/MAX5478/MAX5479 consist of two resistor
arrays with 255 resistive elements; 256 tap points are
accessible to the wipers, along the resistor string
between H_ and L_. The wiper tap point is selected by
programming the potentiometer through the I2C inter-
face. An address byte, a command byte, and 8 data bits
program the wiper position for each potentiometer. The
H_ and L_ terminals of the MAX5477/MAX5478/
MAX5479 are similar to the two end terminals of a
mechanical potentiometer. The MAX5477/MAX5478/
MAX5479 feature power-on reset circuitry that loads the
wiper position from the nonvolatile memory at power-up.
256-POSITION
DECODER
H_
L_
R255
S255
S254
S3
S2
S1
S256
R254
R2
R1
W_
RW
WIPER
CODE 02h
Figure 2. Potentiometer Configuration
ADDRESS INPUTS
A2
A1
A0
SLAVE ADDRESS
GND
0101000
GND
VDD
0101001
GND
VDD
GND
0101010
GND
VDD
0101011
VDD
GND
0101100
VDD
GND
VDD
0101101
VDD
GND
0101110
VDD
0101111
Table 1. Slave Addresses
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