AD5233_15 Datasheet, PDF (1/32 Pages) Analog Devices – Nonvolatile Memory, Quad 64-Position Digital Potentiometer

Nonvolatile Memory, Quad
64-Position Digital Potentiometer
AD5233
FEATURES
Nonvolatile memory stores wiper setting
4-channel independent programmable
64-position resolution
Power-on refreshed with EEMEM settings
EEMEM restore time: 140 μs typical
Full monotonic operation
10 kΩ, 50 kΩ, and 100 kΩ terminal resistance
Permanent memory write protection
Wiper setting readback
Predefined linear increment/decrement instructions
Predefined ±6 dB/step log taper increment/decrement
instructions
SPI-compatible serial interface with readback function
2.7 V to 5.5 V single supply or ±2.5 V dual supply
11 bytes extra nonvolatile memory for user-defined data
100-year typical data retention, TA = 55°C
APPLICATIONS
Mechanical potentiometer replacement
Instrumentation: gain, offset adjustment
Programmable voltage-to-current conversion
Programmable filters, delays, time constants
Programmable power supply
Sensor calibration
GENERAL DESCRIPTION
The AD5233 is a quad-channel nonvolatile memory,¹ digitally
controlled potentiometer² with a 64-step resolution. The device
performs the same electronic adjustment function as a mechanical
potentiometer with enhanced resolution, solid-state reliability,
and remote controllability. The AD5233 has versatile program-
ming using a serial peripheral interface (SPI) for 16 modes of
operation and adjustment, including scratchpad programming,
memory storing and restoring, increment/decrement, ±6 dB/step
log taper adjustment, wiper setting readback, and extra EEMEM
for user-defined information such as memory data for other
components, look-up tables, or system identification
information.
1 _{The terms nonvolatile memory and EEMEM are used interchangeably.}
2 _{The terms digital potentiometer and RDAC are used interchangeably.}
FUNCTIONAL BLOCK DIAGRAM
CS
CLK
SDI
SDO
ADDR
DECODE
SDI SERIAL
INTERFACE
SDO
RDAC1
AD5233
V_DD
REGISTER
A1
W1
EEMEM1
B1
RDAC1
WP
RDY
EEMEM
CONTROL
11 BYTES
USER EEMEM
RDAC2
REGISTER
EEMEM2
A2
W2
B2
RDAC2
O1
O2
PR
GND
DIGITAL
OUTPUT
BUFFER
2
DIGITAL 5
REGISTER
EEMEM5
RDAC3
REGISTER
EEMEM3
RDAC4
REGISTER
EEMEM4
Figure 1.
A3
W3
B3
RDAC3
A4
W4
B4
RDAC4
V_SS
In the scratchpad programming mode, a specific setting can
be programmed directly to the RDAC register, which sets the
resistance between Terminal W to Terminal A and Terminal W
to Terminal B. This setting can be stored into the EEMEM and
is transferred automatically to the RDAC register during system
power-on.
The EEMEM content can be restored dynamically or through
external PR strobing. A WP function protects EEMEM contents.
To simplify the programming, independent or simultaneous
increment or decrement commands can be used to move the
RDAC wiper up or down, one step at a time. For logarithmic
±6 dB step changes in wiper settings, the left or right bit shift
command can be used to double or halve the RDAC wiper
setting.
The AD5233 is available in a thin 24-lead TSSOP package. The
part is guaranteed to operate over the extended industrial
temperature range of −40°C to +85°C.
Rev. B
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