參數(shù)資料
型號(hào)： AD5254BRU1-RL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 8/32頁(yè)
文件大?。?/td> 0K
描述： IC DGTL POT QUAD 1K 20-TSSOP
標(biāo)準(zhǔn)包裝： 1,000
接片： 256
電阻（歐姆）： 1k
電路數(shù)： 4
溫度系數(shù)： 標(biāo)準(zhǔn)值 650 ppm/°C
存儲(chǔ)器類型： 非易失
接口： I²C（設(shè)備位址）
電源電壓： 2.7 V ~ 5.5 V，±2.25 V ~ 2.75 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 20-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 20-TSSOP
包裝： 帶卷 (TR)
AD5253/AD5254
Data Sheet
Rev. C | Page 16 of 32
RDAC/EEMEM Write
Setting the wiper position requires an RDAC write operation.
The single write operation is shown in Figure 27, and the
consecutive write operation is shown in Figure 28. In the
consecutive write operation, if the RDAC is selected and the
address starts at 0, the first data byte goes to RDAC0, the second
data byte goes to RDAC1, the third data byte goes to RDAC2,
and the fourth data byte goes to RDAC3. This operation can be
continued for up to eight addresses with four unused addresses;
it then loops back to RDAC0. If the address starts at any of the
eight valid addresses, N, the data first goes to RDAC_N,
RDAC_N + 1, and so on; it loops back to RDAC0 after the
eighth address. The RDAC address is shown in Table 6.
While the RDAC wiper setting is controlled by a specific
RDAC register, each RDAC register corresponds to a specific
EEMEM location, which provides nonvolatile wiper storage
functionality. The addresses are shown in Table 7. The single
and consecutive write operations also apply to EEMEM write
operations.
There are 12 nonvolatile memory locations: EEMEM4 to
EEMEM15. Users can store 12 bytes of information, such as
memory data for other components, look-up tables, or system
identification information.
In a write operation to the EEMEM registers, the device disables
the I2C interface during the internal write cycle. Acknowledge
polling is required to determine the completion of the write
cycle. See the EEMEM Write-Acknowledge Polling section.
RDAC/EEMEM Read
The AD5253/AD5254 provide two different RDAC or EEMEM
read operations. For example, Figure 29 shows the method of
reading the RDAC0 to RDAC3 contents without specifying the
address, assuming Address RDAC0 was already selected in the
previous operation. If an RDAC_N address other than RDAC0
was previously selected, readback starts with Address N,
followed by N + 1, and so on.
Figure 30 illustrates a random RDAC or EEMEM read
operation. This operation allows users to specify which RDAC
or EEMEM register is read by issuing a dummy write command
to change the RDAC address pointer and then proceeding with
the RDAC read operation at the new address location.
Table 7. Addresses for Writing (Storing) RDAC Settings and
User-Defined Data to EEMEM Registers
(R/W = 0, CMD/REG = 0, EE/RDAC = 1)
A4
A3
A2
A1
A0
Data Byte Description
0
Store RDAC0 setting to EEMEM01
0
1
Store RDAC1 setting to EEMEM11
0
1
0
Store RDAC2 setting to EEMEM21
0
1
Store RDAC3 setting to EEMEM31
0
1
0
Store user data to EEMEM4
0
1
0
1
Store user data to EEMEM5
0
1
0
Store user data to EEMEM6
0
1
Store user data to EEMEM7
0
1
0
Store user data to EEMEM8
0
1
0
1
Store user data to EEMEM9
0
1
0
1
0
Store user data to EEMEM10
0
1
0
1
Store user data to EEMEM11
0
1
0
Store user data to EEMEM12
0
1
0
1
Store user data to EEMEM13
0
1
0
Store user data to EEMEM14
0
1
Store user data to EEMEM15
Table 8. Addresses for Reading (Restoring) RDAC Settings
and User Data from EEMEM
(R/W = 1, CMD/REG = 0, EE/RDAC = 1)
A4
A3
A2
A1
A0
Data Byte Description
0
Read RDAC0 setting from EEMEM0
0
1
Read RDAC1 setting from EEMEM1
0
1
0
Read RDAC2 setting from EEMEM2
0
1
Read RDAC3 setting from EEMEM3
0
1
0
Read User data from EEMEM4
0
1
0
1
Read user data from EEMEM5
0
1
0
Read user data from EEMEM6
0
1
Read user data from EEMEM7
0
1
0
Read user data from EEMEM8
0
1
0
1
Read user data from EEMEM9
0
1
0
1
0
Read user data from EEMEM10
0
1
0
1
Read user data from EEMEM11
0
1
0
Read user data from EEMEM12
0
1
0
1
Read user data from EEMEM13
0
1
0
Read user data from EEMEM14
0
1
Read user data from EEMEM15
1 Users can store any of the 64 RDAC settings for AD5253 or any of the 256
RDAC settings for the AD5254 directly to the EEMEM. This is not limited to
current RDAC wiper setting.
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