X40430 INTERSIL [Intersil Corporation], X40430 Datasheet - Page 8

• Manufacturer Part Number: X40430
• Description: Triple Voltage Monitor with Integrated CPU Supervisor
• Manufacturer: INTERSIL [Intersil Corporation]

PUP1, PUP0: Power-up Bits (Nonvolatile)
The Power-up bits, PUP1 and PUP0, determine the
t
shown in the following table.
WD1, WD0: Watchdog Timer Bits (Nonvolatile)
The bits WD1 and WD0 control the period of the
Watchdog Timer. The options are shown below.
Writing to the Control Registers
Changing any of the nonvolatile bits of the control and
trickle registers requires the following steps:
– Write a 02H to the Control Register to set the Write
– Write a 06H to the Control Register to set the
– Write one byte value to the Control Register that has
Figure 7. Valid Data Changes on the SDA Bus
PURST
PUP1
WD1
Enable Latch (WEL). This is a volatile operation, so
there is no delay after the write. (Operation pre-
ceded by a start and ended with a stop).
Register Write Enable Latch (RWEL) and the WEL
bit. This is also a volatile cycle. The zeros in the data
byte are required. (Operation proceeded by a start
and ended with a stop).
all the control bits set to the desired state. The Con-
trol register can be represented as qxys 001r in
binary, where xy are the WD bits, s is the BP bit and
qr are the power-up bits. This operation proceeded
by a start and ended with a stop bit. Since this is a
0
0
1
1
0
0
1
1
time delay. The nominal power-up times are
PUP0
WD0
0
1
0
1
0
1
0
1
SDA
SCL
Power-on Reset Delay (
Watchdog Time Out Period
disabled (factory setting)
200ms (factory setting)
8
200 milliseconds
25 milliseconds
1.4 seconds
400ms
800ms
50ms
Data Stable
X40430, X40431, X40434, X40435
t
PURST
)
Data Change
– A read operation occurring between any of the previ-
– The RWEL bit cannot be reset without writing to the
To illustrate, a sequence of writes to the device con-
sisting of [02H, 06H, 02H] will reset all of the nonvola-
tile bits in the Control Register to 0. A sequence of
[02H, 06H, 06H] will leave the nonvolatile bits
unchanged and the RWEL bit remains set.
Notes: 1. t
FAULT DETECTION REGISTER
The Fault Detection Register (FDR) provides the user
the status of what causes the system reset active. The
Manual Reset Fail, Watchdog Timer Fail and Three
Low Voltage Fail bits are volatile
The FDR is accessed with a special preamble in the
slave byte (1011) and is located at address 0FFh. It
can only be modified by performing a byte write opera-
tion directly to the address of the register and only one
data byte is allowed for each register write operation.
There is no need to set the WEL or RWEL in the
control register to access this FDR.
LV1F
nonvolatile write cycle it will take up to 10ms (max.)
to complete. The RWEL bit is reset by this cycle and
the sequence must be repeated to change the non-
volatile bits again. If bit 2 is set to ‘1’ in this third step
(qxys 011r) then the RWEL bit is set, but the WD1,
WD0, PUP1, PUP0, and BP bits remain unchanged.
Writing a second byte to the control register is not
allowed. Doing so aborts the write operation and
returns a NACK.
ous operations will not interrupt the register write
operation.
nonvolatile control bits in the control register, power
cycling the device or attempting a write to a write
protected block.
7
2. Watch Dog Timer bits are shipped disabled.
LV2F LV3F WDF
Data Stable
PURST
6
is set to 200ms as factory default.
5
4
MRF
3
2
0
1
0
July 29, 2005
FN8251.0
0
0