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參數(shù)資料
| 型號： | AD5170BRM10-RL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | 256-Position Two-Time Programmable I2C Digital Potentiometer |
| 中文描述： | 10K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO10 |
| 封裝： | 3 X 4.90 MM, MO-187BA, MSOP-10 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 900K |
| 代理商： | AD5170BRM10-RL7 |
AD5170
THEORY OF OPERATION
Rev. A | Page 12 of 24
SDA
SCL
A
W
B
FUSES
EN
DAC
REG.
I
2
C INTERFACE
COMPARATOR
ONE-TIME
PROGRAM/TEST
CONTROL BLOCK
MUX
DECODER
FUSE
REG.
0
Figure 30. Detailed Functional Block Diagram
The AD5170 is a 256-position, digitally controlled variable
resistor (VR) that employs fuse link technology to achieve
memory retention of resistance setting.
An internal power-on preset places the wiper at midscale
during power-on. If the OTP function has been activated, the
device powers up at the user-defined permanent setting.
ONE-TIME PROGRAMMING (OTP)
Prior to OTP activation, the AD5170 presets to midscale during
initial power-on. After the wiper is set at the desired position,
the resistance can be permanently set by programming the T bit
high along with the proper coding (see Table 7 and Table 8) and
one time V
DD_OTP
. Note that fuse link technology of the
AD517x family of digital pots requires V
DD_OTP
between 5.25 V
and 5.5 V to blow the fuses to achieve a given nonvolatile
setting. On the other hand, V
DD
can be 2.7 V to 5.5 V during
operation. As a result, system supply that is lower than 5.25 V
requires external supply for one-time programming. Note that
the user is allowed only one attempt in blowing the fuses. If the
user fails to blow the fuses at the first attempt, the fuses’
structures may have changed such that they may never be
blown regardless of the energy applied at subsequent events. For
details, see the Power Supply Considerations section.
The device control circuit has two validation bits, E1 and E0,
that can be read back to check the programming status (see
Table 7). Users should always read back the validation bits to
ensure that the fuses are properly blown. After the fuses have
been blown, all fuse latches are enabled upon subsequent
power-on; therefore, the output corresponds to the stored
setting. Figure 30 shows a detailed functional block diagram.
PROGRAMMING THE VARIABLE RESISTOR AND
VOLTAGE
Rheostat Operation
The nominal resistance of the RDAC between Terminal A and
Terminal B is available in 2.5 k, 10 k, 50 k, and 100 k.
The nominal resistance (R
AB
) of the VR has 256 contact points
accessed by the wiper terminal, plus the B terminal contact. The
8-bit data in the RDAC latch is decoded to select one of 256
possible settings.
A
W
B
A
W
B
A
W
B
0
Figure 31. Rheostat Mode Configuration
Assuming a 10 k part is used, the wiper’s first connection
starts at the B terminal for data 0x00. Because there is a 50
wiper contact resistance, such a connection yields a minimum
of 100 (2 × 50 ) resistance between Terminal W and
Terminal B. The second connection is the first tap point, which
corresponds to 139 (R
WB
= R
AB
/256 + 2 × R
W
= 39 + 2 × 50 )
for data 0x01. The third connection is the next tap point, repre-
senting 178 (2 × 39 + 2 × 50 ) for data 0x02, and so on.
Each LSB data value increase moves the wiper up the resistor
ladder until the last tap point is reached at 10,100 (R
AB
+ 2 × R
W
).
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| AD5170BRM100 | 256-Position Two-Time Programmable I2C Digital Potentiometer |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD5170BRM2.5 | 功能描述:IC DGTL POT 2.5K 256POS 10-MSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
| AD5170BRM2.5 | 制造商:Analog Devices 功能描述:Digital Potentiometer 256POS 2.5KOhm Single 10-Pin MSOP Tube |
| AD5170BRM2.5-RL7 | 功能描述:IC DGTL POT 2.5K 256POS 10-MSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
| AD5170BRM50 | 功能描述:IC DGTL POT 50K 256POS 10-MSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
| AD5170BRM50-RL7 | 功能描述:IC DGTL POT 50K 256POS 10MSOP TR RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
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