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參數(shù)資料
| 型號： | CAT525W |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封裝： | LEAD-FREE, SOIC-20 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 97K |
| 代理商： | CAT525W |
CAT525
5
Doc. No. 2001, Rev. E
PIN DESCRIPTION
Pin
Name
Function
1VREFH2
Maximum DPP 2 output voltage
2VREFH1
Maximum DPP 1 output voltage
3VDD
Power supply positive
4
CLK
Clock input pin
5
RDY/
BSY
Ready/Busy output
6
CS
Chip select
7
DI
Serial data input pin
8
DO
Serial data output pin
9
PROG
Non-volatile Memory Programming
Enable Input
10
GND
Power supply ground
11
VREFL1
Minimum DPP 1 output voltage
12
VREFL2
Minimum DPP 2 output voltage
13
VREFL3
Minimum DPP 3 output voltage
14
VREFL4
Minimum DPP 4 output voltage
15
VOUT4
DPP 4 output
16
VOUT3
DPP 3 output
17
VOUT2
DPP 2 output
18
VOUT1
DPP 1 output
19
VREFH4
Maximum DPP 4 output voltage
20
VREFH3
Maximum DPP 3 output voltage
DEVICE OPERATION
The CAT525 is a quad 8-bit configured digitally
programmable potentiometer (DPP/CDPP) whose
outputs can be programmed to any one of 256 individual
voltage steps. Once programmed, these output settings
are retained in non-volatile memory and will not be lost
when power is removed from the chip. Upon power up
the DPPs return to the settings stored in non-volatile
memory. Each confitured DPP can be written to and
read from independently without effecting the output
voltage during the read or write cycle. Each output can
also be
adjusted without altering the stored output
setting, which is useful for testing new output settings
before storing them in memory.
DIGITAL INTERFACE
The CAT525 employs a 3 wire serial, Microwire-like
control interface consisting of Clock (CLK), Chip Select
(CS) and Data In (DI) inputs. For all operations, address
and data are shifted in LSB first. In addition, all digital
data must be preceded by a logic “1” as a start bit. The
DPP address and data are clocked into the DI pin on the
clock’s rising edge. When sending multiple blocks of
information a minimum of two clock cycles is required
between the last block sent and the next start bit.
Multiple devices may share a common input data line by
selectively activating the CS control of the desired IC.
Data Outputs (DO) can also share a common line
because the DO pin is Tri-Stated and returns to a high
impedance when not in use.
CHIP SELECT
Chip Select (CS) enables and disables the CAT525’s
read and write operations. When CS is high data may be
read to or from the chip, and the Data Output (DO) pin is
active. Data loaded into the DPP wiper control registers
will remain in effect until CS goes low. Bringing CS to a
logic low returns all DPP outputs to the settings stored in
non-volatile memory and switches DO to its high
impedance Tri-State mode.
Because CS functions like a reset the CS pin has been
desensitized with a 30 ns to 90 ns filter circuit to prevent
noise spikes from causing unwanted resets and the loss
of volatile data.
CLOCK
The CAT525’s clock controls both data flow in and out of
the IC and non-volatile memory cell programming. Serial
data is shifted into the DI pin and out of the DO pin on the
clock’s rising edge. While it is not necessary for the clock
to be running between data transfers, the clock must be
operating in order to write to non-volatile memory, even
though the data being saved may already be resident in
the DPP wiper control register.
No clock is necessary upon system power-up. The
CAT525’s internal power-on reset circuitry loads data
from non-volatile memory to the DPPs without using the
external clock.
CDPP/DPP addressing is as follows:
DPP OUTPUT
A0
A1
VOUT1
00
VOUT2
10
VOUT3
01
VOUT4
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT525WI | 功能描述:數(shù)字電位計 IC Ind Temp 28K 3-Wire RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| CAT525WI-T1 | 功能描述:數(shù)字電位計 IC DPP,NV,256 taps Quad 3 wire,w/Buf RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| CAT5261WI00 | 功能描述:數(shù)字電位計 IC DPP NV Dual 256 taps SPI RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| CAT5261WI-00 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT5261WI-00-T1 | 功能描述:數(shù)字電位計 IC DPP NV DUAL 256 TAP SPI RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
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