13 FN7874.0 June 21, 2011 Functional Pin Descriptions Potentiometers Pins RHI
參數(shù)資料
型號(hào)： ISL23445UFVZ-TK
廠商： Intersil
文件頁(yè)數(shù)： 5/20頁(yè)
文件大?。?/td> 0K
描述： IC DGTL POT 256POS 50K 20TSSOP
產(chǎn)品培訓(xùn)模塊： Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝： 1,000
系列： XDCP™
接片： 256
電阻（歐姆）： 50k
電路數(shù)： 4
溫度系數(shù)： 標(biāo)準(zhǔn)值 65 ppm/°C
存儲(chǔ)器類型： 易失
接口： 4 線 SPI（芯片選擇）
電源電壓： 1.2 V ~ 5.5 V，1.7 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： *
封裝/外殼： *
供應(yīng)商設(shè)備封裝： *
包裝： *
ISL23445
13
FN7874.0
June 21, 2011
Functional Pin Descriptions
Potentiometers Pins
RHI AND RLI
The high (RHi, i = 0, 1, 2, 3) and low (RLi, i = 0, 1, 2, 3) terminals
of the ISL23445 are equivalent to the fixed terminals of a
mechanical potentiometer. RHi and RLi are referenced to the
relative position of the wiper and not the voltage potential on the
terminals. With WRi set to 255 decimal, the wiper will be closest
to RHi, and with the WRi set to 0, the wiper is closest to RLi.
RWI
RWi (i = 0, 1, 2, 3) is the wiper terminal, and it is equivalent to the
movable terminal of a mechanical potentiometer. The position of
the wiper within the array is determined by the WRi register.
Power Pins
VCC
Power terminal for the potentiometer section analog power
source. Can be any value needed to support the voltage range of
the DCP pins, from 1.7V to 5.5V, independent of the VLOGIC
voltage.
Bus Interface Pins
SERIAL CLOCK (SCK)
This input is the serial clock of the SPI serial interface.
SERIAL DATA INPUT (SDI)
The SDI is a serial data input pin for SPI interface. It receives
operation code, wiper address and data from the SPI remote
host device. The data bits are shifted in at the rising edge of the
serial clock SCK, while the CS input is low.
FIGURE 21. WIPER LARGE SIGNAL SETTLING TIME
FIGURE 22. POWER-ON START-UP IN VOLTAGE DIVIDER MODE
FIGURE 23. 10k
Ω -3dB CUT OFF FREQUENCY
FIGURE 24. STANDBY CURRENT vs TEMPERATURE
Typical Performance Curves (Continued)
1V/DIV
0.2s/DIV
WIPER
CS
0.5V/DIV
20s/DIV
VCC
WIPER
0.5V/DIV, 0.2s/DIV
-3dB FREQUENCY = 1.437MHz AT MIDDLE TAP
CH1: RH TERMINAL
CH2: RW TERMINAL
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
-40
-15
10
35
60
85
110
VCC = 1.7V, VLOGIC = 1.2V
VCC = 5.5V, VLOGIC = 5.5V
S
T
A
N
D
B
Y
C
U
R
E
N
T
I C
C
(
A
)
TEMPERATURE (°C)
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