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CAT15002 Datasheet(PDF) 9 Page - Catalyst Semiconductor

Part No. CAT15002
Description  Voltage Supervisor with 2-Kb and 4-Kb SPI Serial CMOS EEPROM
Download  15 Pages
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Maker  CATALYST [Catalyst Semiconductor]
Homepage  http://www.catalyst-semiconductor.com
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CAT15002 Datasheet(HTML) 9 Page - Catalyst Semiconductor

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CAT15002, CAT15004
© 2007 Catalyst Semiconductor, Inc.
9
Doc. No. 1126 Rev. A
Characteristics subject to change without notice
Byte Write
Once the WEL bit is set, the user may execute a write
sequence, by sending a WRITE instruction, an 8-bit
address and data as shown in Figure 6 (for the
CAT15004, bit 3 of the Write instruciton opcode
contains address bit A8). Internal programming will
start after the low to high CS
¯¯ transition. During an
internal write cycle, all commands, except for RDSR
(Read Status Register) will be ignored. The RDY
¯¯¯¯ bit
will indicate if the internal write cycle is in progress
(RDY
¯¯¯¯ high), or the the device is ready to accept
commands (RDY
¯¯¯¯ low).
Page Write
After sending the first data byte to the CAT15002/04,
the host may continue sending data, up to a total of 32
bytes, according to timing shown in Figure 7. After
each data byte, the lower order address bits are
automatically incremented, while the higher order
address bits (page address) remain unchanged. If
during this process the end of page is exceeded, then
loading will “roll over” to the first byte in the page, thus
possibly overwriting previoualy loaded data. Following
completion of the write cycle, the CAT15002/04 is
automatically returned to the write disable state.
Figure 6. Byte WRITE Timing
Notes:
* X = 0 for CAT15002; X = A8 for CAT15004
Dashed Line = mode (1, 1) - - - - - -
Figure 7. Page WRITE Timing
Notes:
* X = 0 for CAT15002; X = A8 for CAT15004
Dashed Line = mode (1, 1) - - - - - -
SCK
SI
SO
00
00
00
1
0
BYTE ADDRESS
D7 D6 D5 D4 D3 D2 D1 D0
0
1
2
3
4
5
6
7
8
131415
1617
1819
20
2122
23
CS
OPCODE
DATA IN
HIGH IMPEDANCE
X*
A7
A0
SCK
SI
SO
00
00
00
10
BYTE ADDRESS
Data
Byte 1
01234
5678
13
14
15 16-23 24-31
Data
Byte 2
Data
Byte 3
Data Byte N
CS
OPCODE
7..1
0
16+(N-1)x8-1..16+(N-1)x8 16+Nx8-1
DATA IN
HIGH IMPEDANCE
A7
A0
X*


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