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AD5232BRUZ100 参数 Datasheet PDF下载

AD5232BRUZ100图片预览
型号: AD5232BRUZ100
PDF下载: 下载PDF文件 查看货源
内容描述: 非易失性内存,双256位数字电位计 [Nonvolatile Memory,Dual 256-Position Digital Potentiometer]
分类和应用: 数字电位计
文件页数/大小: 24 页 / 867 K
品牌: AD [ ANALOG DEVICES ]
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Data Sheet
FEATURES
Nonvolatile Memory,
Dual 256-Position Digital Potentiometer
FUNCTIONAL BLOCK DIAGRAM
V
DD
ADDR
DECODE
SERIAL
INTERFACE
EEMEM1
RDAC1
CS
CLK
SDI
SDO
Dual-channel, 256-position resolution
10 kΩ, 50 kΩ, and 100 kΩ nominal terminal resistance
Nonvolatile memory maintenance of wiper settings
Predefined linear increment/decrement instructions
Predefined ±6 dB step log taper increment/decrement
instructions
SPI-compatible serial interface
Wiper settings and EEMEM readback
3 V to 5 V single-supply operation
±2.5 V dual-supply operation
14 bytes of general-purpose user EEMEM
Permanent memory write protection
100-year typical data retention (T
A
= 55°C)
AD5232
RDAC1
REGISTER
A1
W1
B1
PR
POWER-ON
RESET
RDAC2
REGISTER
A2
W2
B2
EEMEM2
RDAC2
WP
RDY
EEMEM
CONTROL
APPLICATIONS
Mechanical potentiometer replacement
Instrumentation: gain and offset adjustment
Programmable voltage-to-current conversion
Programmable filters, delays, and time constants
Programmable power supply
Low resolution DAC replacement
Sensor calibration
GND
14 BYTES
USER
EEMEM
02618-001
V
SS
Figure 1.
GENERAL DESCRIPTION
The
device provides a nonvolatile, dual-channel,
digitally controlled variable resistor (VR) with 256-position
resolution. This device performs the same electronic adjustment
function as a mechanical potentiometer with enhanced resolution,
solid state reliability, and superior low temperature coefficient
performance. The versatile programming of the
per-
ormed via a microcontroller, allows multiple modes of operation
and adjustment.
In the direct program mode, a predetermined setting of the RDAC
registers (RDAC1 and RDAC2) can be loaded directly from the
microcontroller. Another important mode of operation allows
the RDACx register to be refreshed with the setting previously
stored in the corresponding EEMEM register (EEMEM1 and
EEMEM2). When changes are made to the RDACx register to
establish a new wiper position, the value of the setting can be
saved into the EEMEMx register by executing an EEMEM save
operation. After the settings are saved in the EEMEMx register,
these values are automatically transferred to the RDACx register
to set the wiper position at system power-on. Such operation is
enabled by the internal preset strobe. The preset strobe can also
be accessed externally.
Rev. C
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2001–2013 Analog Devices, Inc. All rights reserved.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
All internal register contents can be read via the serial data
output (SDO). This includes the RDAC1 and RDAC2 registers,
the corresponding nonvolatile EEMEM1 and EEMEM2 registers,
and the 14 spare USER EEMEM registers that are available for
constant storage.
The basic mode of adjustment is the increment and decrement
command instructions that control the wiper position setting
register (RDACx). An internal scratch pad RDACx register can
be moved up or down one step of the nominal resistance between
Terminal A and Terminal B. This step adjustment linearly changes
the wiper to Terminal B resistance (R
WB
) by one position segment
of the device’s end-to-end resistance (R
AB
). For exponential/
logarithmic changes in wiper setting, a left/right shift command
instruction adjusts the levels in ±6 dB steps, which can be useful
for audio and light alarm applications.
The
is available in a thin, 16-lead TSSOP package.
All parts are guaranteed to operate over the extended industrial
temperature range of −40°C to +85°C. An evaluation board, the
is available.