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X40430SX Datasheet(PDF) 9 Page - Xicor Inc.

Part # X40430SX
Description  4kbit EEPROM, Triple Voltage Monitor with Integrated CPU Supervisor
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X40430SX Datasheet(HTML) 9 Page - Xicor Inc.

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X40430/X40431 – Preliminary Information
Characteristics subject to change without notice.
9 of 24
REV 1.2.3 11/28/00
www.xicor.com
Figure 7. Valid Data Changes on the SDA Bus
SCL
SDA
Data Stable
Data Change
Data Stable
At power-up, the FDR is defaulted to all “0”. The sys-
tem needs to initialize this register to all “1” before the
actual monitoring can take place. In the event of any
one of the monitored sources fail. The corresponding
bit in the register will change from a “1” to a “0” to indi-
cate the failure. At this moment, the system should per-
form a read to the register and note the cause of the
reset. After reading the register the system should
reset the register back to all “1” again. The state of the
FDR can be read at any time by performing a random
read at address 0FFh, using the special preamble.
The FDR can be read by performing a random read at
0FFh address of the register at any time. Only one byte
of data is read by the register read operation.
MRF, Manual Reset Fail Bit (Volatile)
The MRF bit will be set to “0” when Manual Reset input
goes active.
WDF, Watchdog Timer Fail Bit (Volatile)
The WDF bit will be set to “0” when the WDO goes
active.
LV1F, Low VCC Reset Fail Bit (Volatile)
The LV1F bit will be set to “0” when VCC (V1MON) falls
below VTRIP1.
LV2F, Low V2MON Reset Fail Bit (Volatile)
The LV2F bit will be set to “0” when V2MON falls below
VTRIP2.
LV3F, Low V3MON Reset Fail Bit (Volatile)
The LV3F bit will be set to “0” when the V3MON falls
below VTRIP3.
Interface Conventions
The device supports a bidirectional bus oriented proto-
col. The protocol defines any device that sends data
onto the bus as a transmitter, and the receiving device
as the receiver. The device controlling the transfer is
called the master and the device being controlled is
called the slave. The master always initiates data
transfers, and provides the clock for both transmit and
receive operations. Therefore, the devices in this family
operate as slaves in all applications.
Serial Clock and Data
Data states on the SDA line can change only during
SCL LOW. SDA state changes during SCL HIGH are
reserved for indicating start and stop conditions. See
Figure 7.
Serial Start Condition
All commands are preceded by the start condition,
which is a HIGH to LOW transition of SDA when SCL is
HIGH. The device continuously monitors the SDA and
SCL lines for the start condition and will not respond to
any command until this condition has been met. See
Figure 8.
Serial Stop Condition
All communications must be terminated by a stop condi-
tion, which is a LOW to HIGH transition of SDA when
SCL is HIGH. The stop condition is also used to place
the device into the Standby power mode after a read
sequence. A stop condition can only be issued after the
transmitting device has released the bus. See Figure 8.


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