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参数资料
| 型号： | AD5254EVAL |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 通用总线功能 |
| 英文描述： | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| 中文描述： | 双路、256抽头、非易失、I2C接口、数字电位器 |
| 文件页数： | 17/28页 |
| 文件大小： | 834K |
| 代理商： | AD5254EVAL |
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AD5253/AD5254
Rev. 0 | Page 17 of 28
1 READ
0
S
0
1
0
1
1
A
D
1
A
D
0
1
A
P
A
RDAC_N OR EEMEM_N
REGISTER DATA
RDAC_N + 1 OR EEMEM_N + 1
REGISTER DATA
SLAVE ADDRESS
(N BYTES + ACKNOWLEDGE)
A
Figure 29. RDAC Current Read. Restricted to Previously Selected Address Stored in the Register.
P
S
SLAVE ADDRESS
0 WRITE
SLAVE ADDRESS
INSTRUCTIONAL AND
ADDRESS
A
1
S
0
REPEATED START
1 READ
A
0
A
(N BYTES + ACKNOWLEDGE)
RDAC OR
EEMEM DATA
A/A
Figure 30. RDAC or EEMEM Random Read
0 WRITE
0
1 CMD
S
0
1
0
1
1
A
D
1
A
D
0
0
A
C
3
C
2
C
1
C
0
A
2
A
1
A
0
A
P
RDAC SLAVE ADDRESS
CMD/
REG
Figure 31. RDAC Quick Command Write (Dummy Write)
From Master to Slave
From Slave to Master
S = Start Condition
P = Stop Condition
A = Acknowledge (SDA Low)
A = Not Acknowledge (SDA High)
AD1, AD0 = I
2
C Device Address Bits. Must match with the logic states at Pins AD1, AD0.
R/W
= Read Enable Bit, Logic High/Write Enable Bit, Logic Low
CMD/REG
= Command Enable Bit, Logic High/Register Access Bit, Logic Low
C3, C2, C1, C0 = Command Bits
A2, A1, A0 = RDAC/EEMEM Register Addresses
Table 9. RDAC-to-EEMEM Interface and RDAC Operation
Quick Command Bits (CMD/REG = 1, A2 = 0)
C3
C2
C1
C0
Command Description
0
0
0
0
NOP
0
0
0
1
Restore EEMEM (A1, A0) to RDAC (A1, A0)
1
0
0
1
0
Store RDAC (A1, A0) to EEMEM (A1, A0)
0
0
1
1
Decrement RDAC (A1, A0) 6 dB
0
1
0
0
Decrement All RDACs 6 dB
0
1
0
1
Decrement RDAC (A1, A0) One Step
0
1
1
0
Decrement All RDACs One Step
0
1
1
1
Reset: Restore EEMEMs to All RDACs
1
0
0
0
Increment RDACs (A1, A0) 6 dB
1
0
0
1
Increment All RDACs 6 dB
1
0
1
0
Increment RDACs (A1, A0) One Step
1
0
1
1
Increment All RDACs One Step
1
1
0
0
Reserved
:
:
:
:
1
1
1
1
Reserved
RDAC/EEMEM Quick Commands
AD5253/AD5254 feature 12 quick commands that facilitate
easy manipulation of RDAC wiper settings as well as provide
RDAC-to-EEMEM storing and restoring functions. The
command format is shown in Figure 31, and the command
descriptions are shown in Table 9.
When using a quick command, issuing a third byte is not
needed but is allowed. The quick commands Reset and Store
RDAC to EEMEM require acknowledge polling to determine
whether the command has finished executing.
1
This command leaves the device in the EEMEM read power state, which
consumes power. Issue the NOP command to return the device to the idle
state.
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