參數(shù)資料
型號(hào)： AD5174BRMZ-10
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 0K
描述： IC DGTL POT 1024POS 10K 10MSOP
產(chǎn)品變化通告： AD5174 Pin Requirement 14/Dec/2010
標(biāo)準(zhǔn)包裝： 50
接片： 1024
電阻（歐姆）： 10k
電路數(shù)： 1
溫度系數(shù)： 標(biāo)準(zhǔn)值 35 ppm/°C
存儲(chǔ)器類型： 非易失
接口： 4 線串行
電源電壓： 2.7 V ~ 5.5 V，±2.5 V ~ 2.75 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 10-MSOP
包裝： 管件
AD5174
Rev. B | Page 15 of 20
Table 10. Memory Map
Data Byte[DB9:DB0]1
Command Number
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Register Contents
X
0
Reserved
X
0
1
1st programmed wiper location (0x01)
X
0
1
0
2nd programmed wiper location (0x02)
X
0
1
3rd programmed wiper location (0x03)
X
0
1
0
4th programmed wiper location (0x04)
…
X
0
1
0
1
0
10th programmed wiper location (0xA)
…
X
0
1
0
1
0
20th programmed wiper location (0x14)
…
X
0
1
0
30th programmed wiper location (0x1E)
…
X
0
1
0
1
0
40th programmed wiper location (0x28)
…
X
0
1
0
1
0
50th programmed wiper location (0x32)
…
X
0
1
0
1
MSB resistance tolerance (0x39)
5
X
0
1
0
1
0
LSB resistance tolerance (0x3A)
1 X is don’t care.
SDO PIN AND DAISY-CHAIN OPERATION
The serial data output pin (SDO) serves two purposes: it can be
used to read the contents of the wiper setting and 50-TP values
using Command 2 and Command 5, respectively (see Table 6)
or the SDO pin can be used in daisy-chain mode. Data is
clocked out of SDO on the rising edge of SCLK. The SDO pin
contains an open-drain N-channel FET that requires a pull-up
resistor. To place the pin in high impedance and minimize the
power dissipation when the pin is used, the 0x8001 data word
followed by Command 0 should be sent to the part. Table 11
provides a sample listing for the sequence of the serial data
input (DIN). Daisy chaining minimizes the number of port pins
required from the controlling IC. As shown in Figure 26, users
need to tie the SDO pin of one package to the DIN pin of the
next package. Users may need to increase the clock period,
because the pull-up resistor and the capacitive loading at the
SDO-to-DIN interface may require additional time delay
between subsequent devices. When two AD5174 devices are
daisy-chained, 32 bits of data are required. The first 16 bits go to
U2, and the second 16 bits go to U1.
Table 11. Minimize Power Dissipation at SDO Pin
DIN
Action
0xXXXX
Last user command sent to the digipot
0x8001
0xXXXX
Prepares the SDO pin to be placed in
high impedance mode
0x0000
High
Impedance
The SDO pin is placed in high
impedance
1 X is don’t care.
Keep the SYNC pin low until all 32 bits are clocked into their
respective serial registers. The SYNC pin is then pulled high to
complete the operation.
DIN
MOSI
SS
SCLK
SDO
SCLK
DIN
SDO
AD5174
U1
AD5174
U2
SYNC
SCLK
SYNC
VDD
C
RP
2.2k
08
71
8-
0
06
Figure 26. Daisy-Chain Configuration Using SDO
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