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PDF ( 数据手册 , 数据表 ) AD5175

零件编号 AD5175
描述 Digital Rheostat with I2C Interface and 50-TP Memory
制造商 Analog Devices
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AD5175 数据手册, 描述, 功能
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Single-Channel, 1024-Position, Digital Rheostat
with I2C Interface and 50-TP Memory
AD5175
FEATURES
Single-channel, 1024-position resolution
10 kΩ nominal resistance
50-times programmable (50-TP) wiper memory
Rheostat mode temperature coefficient: 35 ppm/°C
2.7 V to 5.5 V single-supply operation
±2.5 V to ±2.75 V dual-supply operation for ac or bipolar
operations
I2C-compatible interface
Wiper setting and memory readback
Power on refreshed from memory
Resistor tolerance stored in memory
Thin LFCSP, 10-lead, 3 mm × 3 mm × 0.8 mm package
Compact MSOP, 10-lead 3 mm × 4.9 mm × 1.1 mm package
APPLICATIONS
Mechanical rheostat replacements
Op-amp: variable gain control
Instrumentation: gain, offset adjustment
Programmable voltage to current conversions
Programmable filters, delays, time constants
Programmable power supply
Sensor calibration
FUNCTIONAL BLOCK DIAGRAM
VDD
POWER-ON
RESET
AD5175
SCL
SDA
ADDR
RESET
I2C
SERIAL
INTERFACE
RDAC
REGISTER
10
50-TP
MEMORY
BLOCK
A
W
VSS EXT_CAP
Figure 1.
GND
GENERAL DESCRIPTION
The AD5175 is a single-channel, 1024-position digital rheostat
that combines industry leading variable resistor performance
with nonvolatile memory (NVM) in a compact package.
This device supports both dual-supply operation at ±2.5 V to
±2.75 V and single-supply operation at 2.7 V to 5.5 V, and offers
50-times programmable (50-TP) memory.
The AD5175 device wiper settings are controllable through the
I2C–compatible digital interface. Unlimited adjustments are
allowed before programming the resistance value into the
50-TP memory. The AD5175 does not require any external
voltage supply to facilitate fuse blow and there are 50 oppor-
tunities for permanent programming. During 50-TP activation,
a permanent blow fuse command freezes the resistance position
(analogous to placing epoxy on a mechanical rheostat).
The AD5175 is available in a 3 mm × 3mm 10-lead LFCSP
package and in a 10-lead MSOP package. The part is guaranteed
to operate over the extended industrial temperature range of
−40°C to +125°C.
Rev. 0
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.







AD5175 pdf, 数据表
AD5175
TYPICAL PERFORMANCE CHARACTERISTICS
0.8
+25°C
–40°C
0.6 +125°C
0.4
0.2
0
–0.2
–0.4
–0.6
0
128 256 384 512 640 768 896 1023
CODE (Decimal)
Figure 6. R-INL in Normal Mode vs. Code vs. Temperature
0.4
+25°C
–40°C
0.3 +125°C
0.2
0.1
0
–0.1
–0.2
–0.3
0
128 256 384 512 640 768 896 1023
CODE (Decimal)
Figure 7. R-DNL in Normal Mode vs. Code vs. Temperature
www.DataSheet4U.com
0.7
VDD/VSS = 5V/0V
0.6
0.5
0.4
0.3
0.2
0.1
0
–0.1
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VOLTAGE (V)
Figure 9. Supply Current (IDD) vs. Digital Input Voltage
500
400 IDD = 5V
300
200
100 IDD = 3V
0
–100
ISS = 3V
–200
–300
ISS = 5V
–400
–500
–40 –30 –20 –10 0
10 20 30 40 50 60 70 80 90 100 110
TEMPERATURE (°C)
Figure 10. Supply Current (IDD, ISS) vs. Temperature
700
600 VDD/VSS = 5V/0V
500
400
300
200
100
0
0 128 256 384 512 640 768 896 1023
CODE (Decimal)
Figure 8. Tempco ΔRWA/ΔT vs. Code
7
VDD/VSS = 5V/0V
6
5
4
3
2
1
0
0 85 170 255 340 425 510 595 680 765 850 935 1023
CODE (Decimal)
Figure 11. Theoretical Maximum Current vs. Code
Rev. 0 | Page 8 of 20







AD5175 equivalent, schematic
AD5175
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RDAC REGISTER
The RDAC register directly controls the position of the digital
rheostat wiper. For example, when the RDAC register is loaded
with all 0s, the wiper is connected to Terminal A of the variable
resistor. It is possible to both write to and read from the RDAC
register using the I2C interface. The RDAC register is a standard
logic register; there is no restriction on the number of changes
allowed.
50-TP MEMORY BLOCK
The AD5175 contains an array of 50-TP programmable
memory registers, which allow the wiper position to be pro-
grammed up to 50 times. Table 11 shows the memory map.
Command 3 in Table 7 programs the contents of the RDAC
register to memory. The first address to be programmed is
Location 0x01, see Table 11, and the AD5175 increments the
50-TP memory address for each subsequent program until
the memory is full. Programming data to 50-TP consumes
approximately 4 mA for 55 ms, and takes approximately
350 ms to complete, during which time the shift register is
locked preventing any changes from taking place. Bit C2 of
the control register in Table 10 can be polled to verify that the
fuse program command was successful. No change in supply
voltage is required to program the 50-TP memory; however, a
1 μF capacitor on the EXT_CAP pin is required as shown in
Figure 29.
Prior to 50-TP activation, the AD5175 presets to midscale on
power-up. It is possible to read back the contents of any of the
50-TP memory registers through the I2C interface by using
Command 5 in Table 7. The lower six LSB bits, D0 to D5 of
the data byte, select which memory location is to be read back.
A binary encoded version address of the most recently pro-
grammed wiper memory location can be read back using
Command 6 in Table 7. This can be used to monitor the
spare memory status of the 50-TP memory block.
WRITE PROTECTION
On power-up, serial data input register write commands for
both the RDAC register and the 50-TP memory registers are
disabled. The RDAC write protect bit (Bit C1) of the control
register (see Table 9 and Table 10), is set to 0 by default. This
disables any change of the RDAC register content regardless
of the software commands, except that the RDAC register can
be refreshed from the 50-TP memory using the software reset,
Command 4, or through the hardware by the RESET pin. To
enable programming of the variable resistor wiper position
(programming the RDAC register), the write protect bit
(Bit C1) of the control register must first be programmed.
This is accomplished by loading the serial data input register
with Command 7 (see Table 7). To enable programming of the
50-TP memory block, Bit C0 of the control register, which is set
to 0 by default, must first be set to 1.
Table 7. Command Operation Truth Table
Command Command[DB13:DB10]
Data[DB9:DB0]1
Number C3 C2 C1 C0
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Operation
0
0 000
X X X X X X X X X X NOP: do nothing.
1
0 001
D9 D8 D7 D6 D5 D4 D3 D2 D1 D Write contents of serial register data
to RDAC.
2
0 010
X X X X X X X X X X Read contents of RDAC wiper register.
3
0 011
X X X X X X X X X X Store wiper setting: store RDAC setting
to 50-TP.
4
0 100
X X X X X X X X X X Software reset: refresh RDAC with the
last 50-TP memory stored value.
52
0 101
X X X X D5 D4 D3 D2 D1 D0 Read contents of 50-TP from the SDO
output in the next frame.
6
0 110
X X X X X X X X X X Read address of the last 50-TP
programmed memory location.
73
0 111
X X X X X X X X D1 D0 Write contents of the serial register data
to the control register.
8
1 000
X X X X X X X X X X Read contents of the control register.
9
1 001
X X X X X X X X X D0 Software shutdown.
D0 = 0; normal mode.
D0 = 1; shutdown mode.
1 X is don’t care.
2 See Table 11 for the 50-TP memory map.
3 See Table 10 for bit details.
Rev. 0 | Page 16 of 20










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