x40015 Intersil Corporation, x40015 Datasheet - Page 13

• Manufacturer Part Number: x40015
• Description: Dual Voltage Monitor With Integrated Cpu Supervisor
• Manufacturer: Intersil Corporation

Word Address
The word address is either supplied by the master or
obtained from an internal counter. The internal counter
is undefined on a power up condition.
Operational Notes
The device powers-up in the following state:
– The device is in the low power standby state.
– The WEL bit is set to ‘0’. In this state it is not possi-
– SDA pin is the input mode.
– RESET/RESET Signal is active for
Figure 14. Sequential Read Sequence
ble to write to the device.
Signals from
Signals from
the Master
the Slave
SDA Bus
13
Address
Slave
1
A
C
K
t
X40010, X40011, X40014, X40015
PURST
Data
(1)
.
C
A
K
Data
(2)
Data Protection
The following circuitry has been included to prevent
inadvertent writes:
– The WEL bit must be set to allow write operations.
– The proper clock count and bit sequence is required
– A three step sequence is required before writing into
prior to the stop bit in order to start a nonvolatile
write cycle.
the Control Register to change Watchdog Timer or
Block Lock settings.
A
C
K
(n is any integer greater than 1)
Data
(n-1)
C
A
K
Data
(n)
March 28, 2005
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FN8111.0