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CAT1161LI-42-GT3 Arkusz danych(PDF) 10 Page - Catalyst Semiconductor

Numer części CAT1161LI-42-GT3
Szczegółowy opis  Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer (16K)
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Producent  CATALYST [Catalyst Semiconductor]
Strona internetowa  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT1161LI-42-GT3 Arkusz danych(HTML) 10 Page - Catalyst Semiconductor

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CAT1161, CAT1162
Doc. No. MD-3002 Rev. G
10
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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
CAT1161/2 acknowledges, the Master device sends
the START condition and the slave address again,
this time with the R/W bit set to one. The CAT1161/2
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 CAT1161/2 sends the
inital 8-bit byte requested, the Master will responds
with an acknowledge which tells the device it
requires more data. The CAT1161/2 will continue to
output an 8-bit byte for each acknowledge, thus
sending the STOP condition.
The data being transmitted from the CAT1161/2 is
outputted sequentially with data from address N
followed by data from address N+1. The READ
operation address counter increments all of the
CAT1161/2 address bits so that the entire memory
array can be read during one operation. If more than E
(where E=2047 for the CAT1161/2) bytes are read out,
the counter will ‘wrap around’ and continue to clock out
data bytes.
Manual Reset Operation
The CAT116x RESET or RESET
¯¯¯¯¯¯ pin can also be used
as a manual reset input.
Only the “active” edge of the manual reset input is
internally sensed. The positive edge is sensed if
RESET is used as a manual reset input and the
negative edge is sensed if RESET
¯¯¯¯¯¯ is used as a manual
reset input.
An internal counter starts a 200ms count. During this
time, the complementary reset output will be kept in the
active state. If the manual reset input is forced active for
more than 200ms, the complementary reset output will
switch back to the non active state after the 200ms
expired, regardless for how long the manual reset input
is forced active.
The embedded EEPROM is disabled as long as a reset
condition is maintained on any RESET pin. If the
external forced RESET/RESET
¯¯¯¯¯¯ is longer than internal
controlled time-out period, tPURST, the memory will not
respond with an acknowledge for any access as long as
the manual reset input is active.
Figure 10. Selective Read Timing
Figure 11. Sequential Read Timing
SLAVE
ADDRESS
S
A
C
K
N
O
A
C
K
S
T
O
P
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
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


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