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参数资料
| 型号： | EVAL-ADG2128EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADG2128 |
| 产品变化通告： | Interface Change Notice 12/Apr/2010 |
| 标准包装： | 1 |
| 主要目的： | 接口，交叉点开关/多路复用器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADG2128 |
| 主要属性： | 8 x 12 模拟多路复用器，8 ~ 12V 或 +/- 5V |
| 次要属性： | 图形用户界面 |
| 已供物品： | 板 |
| 相关产品： | ADG2128BCPZ-REEL7TR-ND - IC CROSSPOINT SWIT 8X12 32LFCSP ADG2128BCPZ-REEL-ND - IC CROSSPOINT SWIT 8X12 32LFCSP ADG2128YCPZ-HS-RL7DKR-ND - IC CROSSPOINT SWIT 8X12 32LFCSP ADG2128BCPZ-HS-RL7DKR-ND - IC CROSSPOINT SWIT 8X12 32LFCSP ADG2128YCPZ-HS-RL7CT-ND - IC CROSSPOINT SWIT 8X12 32LFCSP ADG2128BCPZ-HS-RL7CT-ND - IC CROSSPOINT SWIT 8X12 32LFCSP ADG2128YCPZ-HS-RL7TR-ND - IC CROSSPOINT SWIT 8X12 32LFCSP ADG2128BCPZ-HS-RL7TR-ND - IC CROSSPOINT SWIT 8X12 32LFCSP ADG2128YCPZ-REEL7TR-ND - IC CROSSPOINT SWIT 8X12 32LFCSP ADG2128YCPZ-REEL-ND - IC CROSSPOINT SWIT 8X12 32LFCSP |
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ADG2128
Data Sheet
Rev. D | Page 22 of 28
WRITE OPERATION
When writing to the ADG2128, the user must begin with an
address byte and R/W bit, after which the switch acknowledges
that it is prepared to receive data by pulling SDA low. This
address byte is followed by the two 8-bit words. The write
operations for the switch array are shown in Figure 34. Note
that it is only the condition of the switch corresponding to the
bits in the data bytes that changes state. All other switches retain
their previous condition.
READ OPERATION
Readback on the ADG2128 has been designed to work as a tool
for debug and can be used to output the status of any of the 96
switches of the device. The readback function is a 2-step
sequence that works as follows:
1.
Select the relevant X line that you wish to read back from.
Note that there are eight switches connecting that X line to
the eight Y lines. The next step involves writing to the
ADG2128 to tell the part that you would like to know the
status of those eight switches.
a. Enter the I2C address of the ADG2128, and set the
R/W bit to 0 to indicate that you are writing to the
device.
b. Enter the readback address for the X line of interest,
the addresses of which are shown in Table 8. Note that
the ADG2128 is expecting a 2-byte write; therefore, be
sure to enter another byte of don’t cares. (see Figure 35).
c. The ADG2128 then places the status of those eight
switches in a register that can be read back.
2.
The second step involves reading back from the register
that holds the status of the eight switches associated with
your X line of choice.
a. As before, enter the I2C address of the ADG2128. This
time, set the R/W bit to 1 to indicate that you would
like to read back from the device.
b. As with a write to the device, the ADG2128 outputs a
2-byte sequence during readback. Therefore, the first
eight bits of data out that are read back are all 0s. The
next eight bits of data that come back are the status of
the eight Y lines attached to that particular X line. If
the bit is a 1, then the switch is closed (on); similarly,
if it is a 0, the switch is open (off).
The entire read sequence is shown in Figure 35.
05464-
005
DATA
AX3
AX2
AX1
AX0
AY2
AY1
AY0
A0
R/W
A1
A2
x
SCL
SDA
DATA BYTE
ACK
BY
SWITCH
STOP
COND
BY
MASTER
START
COND
BY
MASTER
ADDRESS BYTE
ACK
BY
SWITCH
ACK
BY
SWITCH
LDSW
Figure 34. Write Operation
Table 8. Readback Addresses for Each X Line
X Line
RB7
RB6
RB5
RB4
RB3
RB2
RB1
RB0
X0
0
1
0
1
0
X1
0
1
0
X2
0
1
0
1
0
X3
0
1
0
X4
0
1
0
1
0
1
X5
0
1
0
1
X6
0
1
0
1
0
1
X7
0
1
0
1
X8
0
1
0
1
0
X9
0
1
0
X10
0
1
0
1
0
X11
0
1
0
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