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参数资料
| 型号： | 1025UA-42TE13 |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | TSSOP-8 |
| 文件页数： | 5/17页 |
| 文件大小： | 105K |
| 代理商： | 1025UA-42TE13 |
13
Preliminary Information
CAT1024, CAT1025
Doc No. 3008, Rev. G
Immediate/Current Address Read
The CAT1024 and CAT1025 address counter contains
the address of the last byte accessed, incremented by
one. In other words, if the last READ or WRITE access
was to address N, the READ immediately following
would access data from address N+1. For all devices,
N=E=255. The counter will wrap around to Zero and
continue to clock out valid data for the 2K devices. After
the CAT1024 and CAT1025 receives its slave address
information (with the R/
W bit set to one), it issues an
acknowledge, then transmits the 8-bit byte requested.
The master device does not send an acknowledge, but
will generate a STOP condition.
Selective/Random Read
Selective/Random READ operations allow the Master
device to select at random any memory location for a
READ operation. The Master device first performs a
‘dummy’ write operation by sending the START condition,
slave address and byte addresses of the location it
wishes to read. After the CAT1024 and CAT1025
acknowledges, the Master device sends the START
condition and the slave address again, this time with the
R/
W bit set to one. The CAT1024 and CAT1025 then
responds with its acknowledge and sends the 8-bit byte
requested. The master device does not send an
acknowledge but will generate a STOP condition.
Sequential Read
The Sequential READ operation can be initiated by
either the Immediate Address READ or Selective READ
operations. After the CAT1024 and CAT1025 sends the
inital 8-bit byte requested, the Master will responds with
an acknowledge which tells the device it requires more
data. The CAT1024 and CAT1025 will continue to output
an 8-bit byte for each acknowledge, thus sending the
STOP condition.
The data being transmitted from the CAT1024 and
CAT1025 is sent sequentially with the data from address
N followed by data from address N+1. The READ
operation address counter increments all of the CAT1024
and CAT1025 address bits so that the entire memory
array can be read during one operation.
SLAVE
ADDRESS
S
A
C
K
N
O
A
C
K
S
T
O
P
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
BYTE
ADDRESS (n)
S
A
C
K
DATA n
SLAVE
ADDRESS
A
C
K
S
T
A
R
T
Figure 11. Selective Read Timing
BUS ACTIVITY:
MASTER
SDA LINE
DATA n+x
DATA n
A
C
K
A
C
K
DATA n+1
A
C
K
S
T
O
P
N
O
A
C
K
DATA n+2
A
C
K
P
SLAVE
ADDRESS
Figure 12. Sequential Read Timing
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