MAX16067 Datasheet, PDF (31/47 Pages) Maxim Integrated Products – 6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers

6-Channel, Flash-Configurable System Manager
with Nonvolatile Fault Registers
SDA
SDA
SCL
DATA LINE STABLE, CHANGE OF
DATA VALID DATA ALLOWED
Figure 9. Bit Transfer
SCL
1
SCL S
START
CONDITION
P
STOP
CONDITION
Figure 10. START and STOP Conditions
CLOCK PULSE FOR ACKNOWLEDGE
2
8
9
SDA BY
TRANSMITTER
S
SDA BY
RECEIVER
NACK
Figure 11. Acknowledge
REPEATED START Conditions
A REPEATED START can be sent instead of a STOP
condition to maintain control of the bus during a read
operation. The START and REPEATED START conditions
are functionally identical.
Acknowledge
The acknowledge bit (ACK) is the 9th bit attached to
any 8-bit data word. The receiving device always gener-
ates an ACK. The MAX16067 generates an ACK when
receiving an address or data by pulling SDA low during
the 9th clock period (Figure 11). When transmitting data,
ACK
such as when the master device reads data back from
the MAX16067, the device waits for the master device to
generate an ACK. Monitoring ACK allows for detection
of unsuccessful data transfers. An unsuccessful data
transfer occurs if the receiving device is busy or if a sys-
tem fault has occurred. In the event of an unsuccessful
data transfer, the bus master can reattempt communica-
tion at a later time. The MAX16067 generates a NACK
after the command byte received during a software
reboot, while writing to the flash, or when receiving an
illegal memory address.
______________________________________________________________________________________   31