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参数资料
型号： CAT521W
元件分类： 模拟信号调理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO14
封装： LEAD-FREE, SOIC-14
文件页数： 8/10页
文件大小： 71K
代理商： CAT521W
CAT521
7
Doc. No. 2003, Rev. F
Figure 3. Temporary Change in Output
the same as that which had been there previously no
change in the DPP’s output is noticed. Had the value
held in the control register been different from that stored
in non-volatile memory then a change would occur at the
read cycle’s conclusion.
TEMPORARILY CHANGE OUTPUT
The CAT521 allows temporary changes in the DPP’s
output to be made without disturbing the settings retained
in non-volatile memory.
This feature is particularly
useful when testing for a new output setting and allows
for user adjustment of preset or default values without
losing the original factory settings.
Figure 3 shows the control and data signals needed to
effect a temporary output change. DPP settings may be
changed as many times as required. The temporary
setting remains in effect long as CS remains high. When
CS returns low the DPP will return to the output value
stored in non-volatile memory.
When it is desired to save a new setting acquired using
this feature, the new value must be reloaded into the
DPP wiper control register prior to programming. This is
because the CAT521’s internal control circuitry discards
from the programming register the new data two clock
cycles after receiving it if no PROG signal is received.
Amplified DPP Output
APPLICATION CIRCUITS
Bipolar DPP Output
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
D0
D1
D2
D3
D4
D5
D6
D7
1
NEW DPP DATA
CURRENT DPP DATA
DO
DI
CS
PROG
DPP
OUTPUT
t
1
2
3
4
5
6
7
8
9
10
11
12
N
N+1 N+2
o
CURRENT
DPP VALUE
NON-VOLATILE
NEW
DPP VALUE
VOLATILE
CURRENT
DPP VALUE
NON-VOLATILE
RDY/BSY
MSB
LSB
1111
—— (.98 VREF) + .01 VREF= .990 V
V
= +4.90V
1000
0000
—— (.98 VREF) + .01 VREF= .502 V
V
= +0.02V
0111
1111
—— (.98 VREF) + .01 VREF= .498 V
V
= -0.02V
0000
0001
—— (.98 VREF + .01 VREF = .014 V
V
= -4.86V
0000
—— (.98 VREF) + .01 VREF = .010 V
V
= -4.90V
REF
IF
V
= 5V
REF
255
OUT
DPP INPUT
DPP OUTPUT
ANALOG
R = R
OUTPUT
REF
OUT
128
255
127
255
REF
OUT
1
255
REF
OUT
REF
OUT
0
255
VFS
= 0.99 V
V
= 0.01 V
ZERO
V
= ——— (V
- V
) + V
DPP
CODE
255
FS
ZERO
GND
VDD
CONTROL
& DATA
+
–
OP 07
-15V
+15V
+5V
RR
i
F
For R =
I
RF
V
= 2V
-V
OUT
I
DPP
Vi
VOUT
VOUT =
VDPP (RI+RF)-VIRF
RI
VREFH
VREFL
CAT521
GND
VDD
VREFH
VREFL
CONTROL
& DATA
+
–
OP 07
VOUT
-15V
+15V
+5V
RR
I
F
V
= (1 + –––) V
OUT
DPP
RF
RI
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相关代理商/技术参数
参数描述
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CAT5221WI00 制造商:ON Semiconductor 功能描述:DPP, NV, QUAD 64 TAPS, I2C - Rail/Tube
CAT5221WI-00 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述:
CAT5221WI-00-T1 功能描述:数字电位计 IC DPP NV QUAD 64 TAPS I2C RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel
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