DS1678 Datasheet, PDF (24/25 Pages) Maxim Integrated Products – Real-Time Event Recorder

Figure 6. Data Transfer on I²C Serial Bus
DS1678 Real-Time Event Recorder
SDA
SCL
START
CONDITION
MSB
1
slave address
2
6
R/W
direction
bit
acknowledgement
signal from receiver
7
8
9
1
ACK
acknowledgement
signal from receiver
2
3-8
8
repeated if more bytes
are transferred
9
ACK
STOP CONDITION
OR
REPEATED
START CONDITION
Figure 7. I²C Serial Communication with DS1678
W rite to Mem ory Address Pointer
SCL
SDA
S 1 0 0 1 0 1 0 W A A7 A6 A5 A4 A3 A2 A1 A0 A P
S ta rt
Device Address Byte
DS1678
ACK
W rite to Mem ory Location (Single Byte)
Mem ory Address Byte
DS1678 Stop
ACK
SCL
SDA
S 1 0 0 1 0 1 0 W A A7 A6 A5 A4 A3 A2 A1 A0 A D7 D6 D5 D4 D3 D2 D1 D0 A P
Start
Device Address Byte
DS1678 M em ory Address Byte
ACK
DS1678
ACK
Read Single Byte from Current M em ory Address Pointer Location
SCL
SDA
S 1 0 0 1 0 1 0 Rd A D7 D6 D5 D4 D3 D2 D1 D0 N
P
Data Byte
DS1678 Stop
ACK
Start
Device Address Byte
DS1678
ACK
Data Byte
Master Stop
NACK
Read M ultiple Bytes from Current M em ory Address Pointer Location
SCL
SDA
S 1 0 0 1 0 1 0 Rd A D7 D6 D5 D4 D3 D2 D1 D0 A D7 D6 D5 D4 D3 D2 D1 D0 N
P
Start
Device Address Byte
DS1678
ACK
M ost Significant
Data Byte
Read Single Byte from New M em ory Address Pointer Location
M as ter
ACK
Least Significant
Data Byte
Master Stop
NACK
SCL
SDA
S 1 0 0 1 0 1 0 W A A7 A6 A5 A4 A3 A2 A1 A0 A
R 1 0 0 1 0 1 0 Rd A
Start
SCL
SDA
Device Address Byte
DS1678 Mem ory Address Byte
ACK
DS1678 Repeated
ACK Start
Device Address
B yte
DS1678
ACK
D7 D6 D5 D4 D3 D2 D1 D0 N
P
Data Byte
Master Stop
NACK
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