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NV34C02WF Arkusz danych(PDF) 7 Page - ON Semiconductor

Numer części NV34C02WF
Szczegółowy opis  EEPROM SPD 2-kb I2C
Download  11 Pages
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
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NV34C02WF Arkusz danych(HTML) 7 Page - ON Semiconductor

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NV34C02WF
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7
18
9
1
8
BYTE ADDRESS
DATA
SCL
SDA
WP
Figure 9. WP Timing
tHD:WP
tSU:WP
A0
A7
D7
D0
Read Operations
Immediate Address Read
In standby mode, the NV34C02WF internal address
counter points to the data byte immediately following the
last byte accessed by a previous operation. If that ‘previous’
byte was the last byte in memory, then the address counter
will point to the 1st memory byte, etc.
When, following a START, the NV34C02WF is presented
with a Slave address containing a ‘1’ in the R/W bit position
(Figure 10), it will acknowledge (ACK) in the 9th clock cycle,
and will then transmit data being pointed at by the internal
address counter. The Master can stop further transmission by
issuing a NoACK, followed by a STOP condition.
Selective Read
The Read operation can also be started at an address
different from the one stored in the internal address counter.
The address counter can be initialized by performing a
‘dummy’ Write operation (Figure 11). Here the START is
followed by the Slave address (with the R/W bit set to ‘0’)
and the desired byte address. Instead of following up with
data, the Master then issues a 2nd START, followed by the
‘Immediate Address Read’ sequence, as described earlier.
Sequential Read
If the Master acknowledges the 1st data byte transmitted
by the NV34C02WF, then the device will continue
transmitting as long as each data byte is acknowledged by
the Master (Figure 12). If the end of memory is reached
during sequential Read, then the address counter will
‘wrap−around’ to the beginning of memory, etc. Sequential
Read works with either ‘Immediate Address Read’ or
‘Selective Read’, the only difference being the starting byte
address.
SCL
SDA
8th Bit
STOP
NO ACK
DATA OUT
8
SLAVE
ADDRESS
S
A
C
K
DATA
N
O
A
C
K
S
T
O
P
P
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
Figure 10. Immediate Address Read Timing
9


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