SMM766B_11 Datasheet, PDF (21/39 Pages) Summit Microelectronics, Inc. – Six-Channel Active DC Output Controller, Monitor, Marginer and Sequencer with Sequence-Link™

SMM766B
APPLICATIONS INFORMATION (CONTINUED)
AUTO-MONITOR FUNCTION
The auto-monitor function is used for monitoring all
supplies throughout the power-on and power-off
sequencing, force shutdown operation, and monitor
mode. The auto-monitor function is paused during an
I²C transaction. This function is re-enabled by several
methods as described in the diagrams below.
Pausing Auto-Monitor: I²C Transaction Addressing the SMM766B
SDA
Start
SA3
SA2
SA1
SA0
BA2
BA1
BA0
R/W
ACK
SCL
AUTO-MONITOR
Figure 9A: Auto-monitor is paused on the falling edge of SCL during the R/W bit following a valid slave address.
Re-Enabling Auto-Monitor: I²C Read Transaction
SDA
SCL
RD3
RD2
RD1
RD0
NACK
from Host
Stop
SYSTEM CLOCK
(T=5us)
AUTO-MONITOR
Figure 9B: At the end of an I²C read transaction, auto-monitor is re-enabled on the falling edge of the
internal system clock after the Stop.
Summit Microelectronics, Inc
2122 3.1 5/24/2011
21