X40430V14I-C [INTERSIL]
Triple Voltage Monitor with Integrated CPU Supervisor; 三重电压监控器，集成了CPU监控
| 型号： | X40430V14I-C |
| 厂家： | 
Intersil |
| 描述： | Triple Voltage Monitor with Integrated CPU Supervisor |
| 文件： | 总24页 (文件大小：379K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
X40430, X40431, X40434, X40435
®
4Kbit EEPROM
Data Sheet
July 29, 2005
FN8251.0
DESCRIPTION
Triple Voltage Monitor with Integrated
CPU Supervisor
The X40430, X40431, X40434, X40435 combines
power-on reset control, watchdog timer, supply voltage
supervision, second and third voltage supervision,
FEATURES
™
manual reset, and Block Lock protect serial EEPROM
• Monitoring voltages: 5V to 9V
in one package. This combination lowers system cost,
reduces board space requirements, and increases
reliability.
• Independent core voltage monitor
• Triple voltage detection and reset assertion
—Standard reset threshold settings. See selec-
tion table on page 2.
—Adjust low voltage reset threshold voltages
using special programming sequence
Applying voltage to V
activates the power-on reset
CC
circuit which holds RESET/RESET active for a period of
time. This allows the power supply and system oscilla-
tor to stabilize before the processor can execute code.
—Reset signal valid to V = 1V
CC
—Monitor three separate voltages
• Fault detection register
• Selectable power-on reset timeout
(0.05s, 0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval
(25ms, 200ms, 1.4s or off)
• Debounced manual reset input
• Low power CMOS
—25µA typical standby current, watchdog on
—6µA typical standby current, watchdog off
• Memory security
• 4Kbits of EEPROM
—16 byte page write mode
Low V detection circuitry protects the user’s system
CC
from low voltage conditions, resetting the system
when V
falls below the minimum V
point.
CC
TRIP1
RESET/RESET is active until V
returns to proper
CC
operating level and stabilizes. A second and third volt-
age monitor circuit tracks the unregulated supply to
provide a power fail warning or monitors different
power supply voltage. Three common low voltage
combinations are available. However, Intersil’s unique
circuits allows the threshold for either voltage monitor
to be reprogrammed to meet specific system level
requirements or to fine-tune the threshold for applica-
tions requiring higher precision.
—5ms write cycle time (typical)
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Block lock protect 0, or 1/2, of EEPROM
• 400kHz 2-wire interface
A manual reset input provides debounce circuitry for
minimum reset component count.
The Watchdog Timer provides an independent protec-
tion mechanism for microcontrollers. When the micro-
controller fails to restart a timer within a selectable
time out interval, the device activates the WDO signal.
The user selects the interval from three preset values.
Once selected, the interval does not change, even
after cycling the power.
• 2.7V to 5.5V power supply operation
• Available packages
—14-lead SOIC, TSSOP
APPLICATIONS
• Communication Equipment
—Routers, Hubs, Switches
—Disk Arrays, Network Storage
• Industrial Systems
—Process Control
—Intelligent Instrumentation
• Computer Systems
The memory portion of the device is a CMOS Serial
EEPROM array with Intersil’s Block Lock protection.
The array is internally organized as x 8. The device
features a 2-wire interface and software protocol
2
allowing operation on an I C bus.
—Computers
—Network Servers
™
The device utilizes Intersil’s proprietary Direct Write
cell, providing a minimum endurance of 100,000
cycles and a minimum data retention of 100 years.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
1
All other trademarks mentioned are the property of their respective owners.
X40430, X40431, X40434, X40435
BLOCK DIAGRAM
+
V3MON
V3FAIL
V2FAIL
VTRIP3
V3 Monitor
-
V
or
Logic
CC
V2MON*
+
-
V2MON
V2 Monitor
VTRIP2
Logic
Watchdog
and
Fault Detection
Register
Data
WDO
MR
Reset Logic
SDA
WP
Register
Status
Register
Command
Decode Test
& Control
Logic
EEPROM
Array
SCL
RESET
X40430/34
Power-on,
Manual Reset
Low Voltage
Reset
RESET
+
V
CC
X40431/35
VTRIP1
Generation
(V1MON)
V
Monitor
*X40430, X40431=
V2MON
X40434, X40435 =
CC
-
LOWLINE
Logic
V
CC
Expected System
Voltages
POR
(system)
Device
Vtrip1(V)
Vtrip2(V)
Vtrip3(V)
X40430, X40431
2.0–4.75*
4.55–4.65*
4.35–4.45*
2.95–3.05*
1.70–4.75
2.85–2.95
2.55–2.65
2.15–2.25
1.70–4.75
1.65–1.75
1.65–1.75
1.65–1.75
-A
-B
-C
5V; 3V or 3.3V; 1.8V
5V; 3V; 1.8V
3.3V; 2.5V; 1.8V
RESET = X40430
RESET = X40431
X40434, X40435
2.0–4.75*
4.55–4.65*
4.55–4.65*
4.55–4.65*
0.90–3.50*
1.25–1.35*
1.25–1.35*
0.95–1.05*
1.70–4.75
3.05–3.15
2.85–2.95
2.85–2.95
-A
-B
-C
5V; 3.3V; 1.5V
5V; 3V or 3.3V; 1.5V
5V; 3 or 3.3V; 1.2V
RESET = X40434
RESET = X40435
*Voltage monitor requires Vcc to operate. Others are independent of Vcc.
PIN CONFIGURATION
X40431, X40435
14-Pin SOIC, TSSOP
X40430, X40434
14-Pin SOIC, TSSOP
VCC
V2FAIL
V2MON
LOWLINE
NC
VCC
V2FAIL
V2MON
1
2
3
4
14
13
12
11
1
2
3
4
14
13
12
11
WDO
V3FAIL
V3MON
WP
WDO
V3FAIL
V3MON
WP
LOWLINE
NC
MR
RESET
VSS
MR
RESET
VSS
5
6
7
10
9
8
5
6
7
10
9
8
SCL
SCL
SDA
SDA
PIN DESCRIPTION
Pin Name
Function
1
V2FAIL V2 Voltage Fail Output. This open drain output goes LOW when V2MON is less than VTRIP2 and goes
HIGH when V2MON exceeds VTRIP2. There is no power-up reset delay circuitry on this pin.
2
V2MON V2 Voltage Monitor Input. When the V2MON input is less than the VTRIP2 voltage, V2FAIL goes LOW.
This input can monitor an unregulated power supply with an external resistor divider or can monitor a
second power supply with no external components. Connect V2MON to VSS or V when not used. The
CC
V2MON comparator is supplied by V2MON (X40430, X40431) or by the VCC input (X40434, X40435).
3
4
LOWLINE Early Low VCC Detect. This CMOS output signal goes LOW when V < VTRIP1 and goes high when
CC
V
> VTRIP1.
CC
NC
No connect.
FN8251.0
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July 29, 2005
X40430, X40431, X40434, X40435
PIN DESCRIPTION (Continued)
Pin Name
Function
5
MR
Manual Reset Input. Pulling the MR pin LOW initiates a system reset. The RESET/RESET pin will re-
main HIGH/LOW until the pin is released and for the tPURST thereafter.
6
RESET/ RESET Output. (X40431, X40435) This open drain pin is an active LOW output which goes LOW when-
ever VCC falls below VTRIP1 voltage or if manual reset is asserted. This output stays active for the pro-
grammed time period (tPURST) on power-up. It will also stay active until manual reset is released and for
tPURST thereafter.
RESET
RESET Output. (X40430, X40434) This pin is an active HIGH CMOS output which goes HIGH when-
ever VCC falls below VTRIP1 voltage or if manual reset is asserted. This output stays active for the pro-
grammed time period (tPURST) on power-up. It will also stay active until manual reset is released and for
tPURST thereafter.
7
8
VSS
Ground
SDA
Serial Data. SDA is a bidirectional pin used to transfer data into and out of the device. It has an open
drain output and may be wire ORed with other open drain or open collector outputs. This pin requires a
pull up resistor and the input buffer is always active (not gated).
Watchdog Input. A HIGH to LOW transition on the SDA (while SCL is toggled from HIGH to LOW and
followed by a stop condition) restarts the Watchdog timer. The absence of this transition within the
watchdog time out period results in WDO going active.
9
SCL
WP
Serial Clock. The Serial Clock controls the serial bus timing for data input and output.
10
Write Protect. WP HIGH prevents writes to any location in the device (including all the registers). It has
an internal pull down resistor (>10MΩ typical).
11 V3MON V3 Voltage Monitor Input. When the V3MON input is less than the VTRIP3 voltage, V3FAIL goes LOW.
This input can monitor an unregulated power supply with an external resistor divider or can monitor a
third power supply with no external components. Connect V3MON to VSS or V when not used. The
CC
V3MON comparator is supplied by the V3MON input.
12 V3FAIL V3 Voltage Fail Output. This open drain output goes LOW when V3MON is less than VTRIP3 and goes
HIGH when V3MON exceeds VTRIP3. There is no power-up reset delay circuitry on this pin.
13
14
WDO
VCC
WDO Output. WDO is an active LOW, open drain output which goes active whenever the watchdog
timer goes active.
Supply Voltage
PRINCIPLES OF OPERATION
Figure 1. Connecting a Manual Reset Push-Button
VCC
X40430, X40434
Power-on Reset
Applying power to the X40430, X40431, X40434,
X40435 activates a Power-on Reset Circuit that pulls
the RESET/RESET pins active. This signal provides
several benefits.
System
Reset
RESET
MR
Manual
Reset
– It prevents the system microprocessor from starting
to operate with insufficient voltage.
– It prevents the processor from operating prior to sta-
bilization of the oscillator.
Manual Reset
– It allows time for an FPGA to download its configura-
tion prior to initialization of the circuit.
By connecting a push-button directly from MR to ground,
the designer adds manual system reset capability. The
MR pin is LOW while the push-button is closed and
RESET/RESET pin remains HIGH/LOW until the push-
– It prevents communication to the EEPROM, greatly
reducing the likelihood of data corruption on power-up.
button is released and for t
thereafter.
PURST
When V exceeds the device V
threshold value
CC
TRIP1
for t
(selectable) the circuit releases the RESET
PURST
(X40431, X40435) and RESET (X40430, X40434) pin
allowing the system to begin operation.
FN8251.0
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July 29, 2005
X40430, X40431, X40434, X40435
Low Voltage V (V1 Monitoring)
Figure 2. Two Uses of Multiple Voltage Monitoring
CC
During operation, the X40430, X40431, X40434,
X40435 monitors the level and asserts
RESET/RESET if supply voltage falls below a preset
minimum V . The RESET/RESET signal prevents
the microprocessor from operating in a power fail or
brownout condition. The RESET/RESET signal
remains active until the voltage drops below 1V. It also
VCC
V
CC
X40431-A
TRIP1
VCC
RESET
V2FAIL
5V
6-10V
1M
System
Reset
3.3V
V2MON
V3MON
(1.7V)
remains active until V
returns and exceeds V
CC
TRIP1
V3FAIL
Power
Fail
Interrupt
390K
for tPURST
.
Low Voltage V2 Monitoring
The X40430 also monitors a second voltage level and
asserts V2FAIL if the voltage falls below a preset mini-
VCC
X40431-B
mum V
. The V2FAIL signal is either ORed with
TRIP2
Unreg.
Supply
5V
RESET to prevent the microprocessor from operating
in a power fail or brownout condition or used to inter-
rupt the microprocessor with notification of an impend-
ing power failure.
VCC
Reg
System
Reset
RESET
V2MON
3.0V
Reg
V2FAIL
V3FAIL
For the X40430 and X40431 the V2FAIL signal
remains active until the V2MON drops below 1V
(V2MON falling). It also remains active until V2MON
1.8V
Reg
V3MON
returns and exceeds V
. This voltage sense cir-
TRIP2
Notice: No external components required to monitor three voltages.
cuitry monitors the power supply connected to V2MON
pin. If V = 0, V2MON can still be monitored.
CC
For the X40434 and X40435, the V2FAIL signal
remains active until V drops below 1V and remains
CC
active until V2MON returns and exceeds V
. This
TRIP2
sense circuitry is powered by V . If V = 0, V2MON
CC
CC
cannot be monitored.
Low Voltage V3 Monitoring
The X40430, X40431, X40434, X40435 also monitors
a third voltage level and asserts V3FAIL if the voltage
falls below a preset minimum V
. The V3FAIL sig-
TRIP3
nal is either ORed with RESET to prevent the micro-
processor from operating in a power fail or brownout
condition or used to interrupt the microprocessor with
notification of an impending power failure. The V3FAIL
signal remains active until the V3MON drops below 1V
(V3MON falling). It also remains active until V3MON
returns and exceeds V
.
TRIP3
This voltage sense circuitry monitors the power supply
connected to V3MON pin. If V = 0, V3MON can still
CC
be monitored.
Early Low V Detection (LOWLINE)
CC
This CMOS output goes LOW earlier than
RESET/RESET whenever V
falls below the V
CC
TRIP1
voltage and returns high when V
exceeds the
CC
V
voltage. There is no power-up delay circuitry
) on this pin.
TRIP1
(t
PURST
FN8251.0
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July 29, 2005
X40430, X40431, X40434, X40435
Figure 3. V
Set/Reset Conditions
TRIPX
VTRIPX
(X = 1, 2, 3)
VCC/V2MON/V3MON
VP
WDO
SCL
7
0
0
7
0
7
SDA
tWC
A0h
00h
WATCHDOG TIMER
Setting a V
Voltage (x = 1, 2, 3)
TRIPx
There are two procedures used to set the threshold
voltages (V ), depending if the threshold voltage
The Watchdog Timer circuit monitors the microproces-
sor activity by monitoring the SDA and SCL pins. A
standard read or write sequence to any slave address
byte restarts the watchdog timer and prevents the
WDO signal going active. A minimum sequence to
reset the watchdog timer requires four microprocessor
instructions namely, a Start, Clock Low, Clock High
and Stop. The state of two nonvolatile control bits in
the Status Register determine the watchdog timer
period. The microprocessor can change these watch-
dog bits by writing to the X40430, X40431, X40434,
X40435 control register (also refer to page 20).
TRIPx
to be stored is higher or lower than the present value.
For example, if the present V is 2.9 V and the
TRIPx
new V
is 3.2 V, the new voltage can be stored
TRIPx
directly into the V
cell. If however, the new setting
TRIPx
is to be lower than the present setting, then it is neces-
sary to “reset” the V
new value.
voltage before setting the
TRIPx
Setting a Higher V
Voltage (x = 1, 2, 3)
TRIPx
To set a V
threshold to a new voltage which is
TRIPx
higher than the present threshold, the user must apply
the desired V threshold voltage to the corre-
Figure 4. Watchdog Restart
TRIPx
sponding input pin Vcc(V1MON), V2MON or V3MON.
Then, a programming voltage (Vp) must be applied to the
WDO pin before a START condition is set up on SDA.
Next, issue on the SDA pin the Slave Address A0h, fol-
.6µs
1.3µs
SCL
SDA
lowed by the Byte Address 01h for V
, 09h for
TRIP1
V
, and 0Dh for V
, and a 00h Data Byte in order
TRIP2
TRIP3
to program V
. The STOP bit following a valid write
TRIPx
Start
Stop
WDT Reset
operation initiates the programming sequence. Pin WDO
must then be brought LOW to complete the operation. To
check if the V
slightly greater than V
Slowly ramp down VXMON and observe when the corre-
sponding outputs (LOWLINE, V2FAIL and V3FAIL)
switch. The voltage at which this occurs is the V
(actual).
has been set, set VXMON to a value
TRIPX
V1, V2 AND V3 THRESHOLD PROGRAM
PROCEDURE (OPTIONAL)
(that was previously set).
TRIPX
The X40430 is shipped with standard V1, V2 and V3
threshold (V ) voltages. These
V
V
TRIP3
TRIP1,
TRIP2,
TRIPX
values will not change over normal operating and stor-
age conditions. However, in applications where the
standard thresholds are not exactly right, or if higher
precision is needed in the threshold value, the X40430,
X40431, X40434, X40435 trip points may be adjusted.
The procedure is described below, and uses the appli-
cation of a high voltage control signal.
FN8251.0
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July 29, 2005
X40430, X40431, X40434, X40435
CASE A
CONTROL REGISTER
Now if the desired V
is greater than the V
The Control Register provides the user a mechanism
for changing the Block Lock and Watchdog Timer set-
tings. The Block Lock and Watchdog Timer bits are
nonvolatile and do not change when power is
removed.
TRIPX
TRIPX
TRIPX
TRIPX
(actual), then add the difference between V
(desired) – V (actual) to the original V
TRIPX
desired. This is your new V
applied to VXMON and the whole sequence should be
repeated again (see Figure 5).
that should be
TRIPX
The Control Register is accessed with a special pream-
ble in the slave byte (1011) and is located at address
1FFh. It can only be modified by performing a byte write
operation directly to the address of the register and only
one data byte is allowed for each register write opera-
tion. Prior to writing to the Control Register, the WEL
and RWEL bits must be set using a two step process,
with the whole sequence requiring 3 steps. See "Writing
to the Control Registers" on page 7.
CASE B
Now if the V
(actual), is higher than the V
TRIPX
TRIPX
(desired), perform the reset sequence as described in
the next section. The new V
to VXMON will now be: V
voltage to be applied
TRIPX
TRIPX
(desired) – (V
TRIPX
(actual) – V
(desired)).
TRIPX
Note: This operation does not corrupt the memory array.
The user must issue a stop, after sending this byte to
the register, to initiate the nonvolatile cycle that stores
WD1, WD0, PUP1, PUP0, and BP. The X40430,
X40431, X40434, X40435 will not acknowledge any
data bytes written after the first byte is entered.
Setting a Lower V
Voltage (x = 1, 2, 3)
TRIPx
In order to set V
to a lower voltage than the
TRIPx
present value, then V
ing to the procedure described below. Once V
must first be “reset” accord-
TRIPx
TRIPx
has been “reset”, then V
can be set to the desired
TRIPx
The state of the Control Register can be read at any
time by performing a random read at address 1FFh,
using the special preamble. Only one byte is read by
each register read operation. The master should
supply a stop condition to be consistent with the bus
protocol.
voltage using the procedure described in “Setting a
Higher V Voltage”.
TRIPx
Resetting the V
Voltage
TRIPx
To reset a V
voltage, apply the programming volt-
TRIPx
age (Vp) to the WDO pin before a START condition is
set up on SDA. Next, issue on the SDA pin the Slave
Address A0h followed by the Byte Address 03h for
7
6
5
4
3
2
1
0
PUP1 WD1 WD0
BP
0
RWEL WEL PUP0
V
, 0Bh for V
, and 0Fh for V
, followed
TRIP1
TRIP2
TRIP3
by 00h for the Data Byte in order to reset V
. The
TRIPx
RWEL: Register Write Enable Latch (Volatile)
STOP bit following a valid write operation initiates the
programming sequence. Pin WDO must then be
brought LOW to complete the operation.
The RWEL bit must be set to “1” prior to a write to the
Control Register.
After being reset, the value of V
nal value of 1.7V or lesser.
becomes a nomi-
TRIPx
Notes: 1. This operation does not corrupt the memory array.
2. Set VCC ≅ 1.5(V2MON or V3MON), when setting
VTRIP2 or VTRIP3 respectively.
Figure 5. Sample V
Reset Circuit
TRIP
VP
Adjust
V2FAIL
µC
1
6
2
7
14
RESET
13
Run
9
X4043X
VTRIP1
Adj.
8
SCL
VTRIP2
Adj.
SDA
FN8251.0
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July 29, 2005
X40430, X40431, X40434, X40435
Figure 6. V
Set/Reset Sequence (X = 1, 2, 3)
TRIPX
Vx = VCC, VxMON
VTRIPX Programming
Note: X = 1, 2, 3
Let: MDE = Maximum Desired Error
Desired
No
VTRIPX
<
MDE+
Acceptable
Present Value
Desired Value
YES
Error Range
MDE–
Execute
TRIPX Reset Sequence
V
Error = Actual - Desired
Set VX = desired VTRIPX
New VX applied =
Old VX applied + | Error |
Execute
Set Higher VX Sequence
New VX applied =
Old VX applied - | Error |
Apply VCC and Voltage
Execute Reset VTRIPX
Sequence
> Desired VTRIPX to
VX
NO
Decrease
VX
Output Switches?
YES
V
Error < MDE–
Error > MDE+
Actual
TRIPX -
VTRIPX
Desired
| Error | < | MDE |
DONE
WEL: Write Enable Latch (Volatile)
BP: Block Protect Bits (Nonvolatile)
The WEL bit controls the access to the memory and to
the Register during a write operation. This bit is a vola-
tile latch that powers up in the LOW (disabled) state.
While the WEL bit is LOW, writes to any address,
including any control registers will be ignored (no
acknowledge will be issued after the Data Byte). The
WEL bit is set by writing a “1” to the WEL bit and
zeroes to the other bits of the control register.
The Block Protect Bit BP, determines which blocks of
the array are write protected. A write to a protected
block of memory is ignored. The block protect bit will
prevent write operations to half or none of the array.
Protected Addresses
(Size)
Memory Array
Lock
BP
0
None
None
1
100h – 1FFh (256 bytes)
Upper Half of
Memory Array
Once set, WEL remains set until either it is reset to 0
(by writing a “0” to the WEL bit and zeroes to the other
bits of the control register) or until the part powers up
again. Writes to the WEL bit do not cause a high volt-
age write cycle, so the device is ready for the next
operation immediately after the stop condition.
FN8251.0
July 29, 2005
7
X40430, X40431, X40434, X40435
PUP1, PUP0: Power-up Bits (Nonvolatile)
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.
The Power-up bits, PUP1 and PUP0, determine the
tPURST time delay. The nominal power-up times are
shown in the following table.
PUP1 PUP0
Power-on Reset Delay (tPURST)
0
0
1
1
0
1
0
1
50ms
200ms (factory setting)
400ms
– A read operation occurring between any of the previ-
ous operations will not interrupt the register write
operation.
800ms
WD1, WD0: Watchdog Timer Bits (Nonvolatile)
– The RWEL bit cannot be reset without writing to the
nonvolatile control bits in the control register, power
cycling the device or attempting a write to a write
protected block.
The bits WD1 and WD0 control the period of the
Watchdog Timer. The options are shown below.
WD1
WD0
Watchdog Time Out Period
1.4 seconds
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.
0
0
1
1
0
1
0
1
200 milliseconds
25 milliseconds
disabled (factory setting)
Notes: 1. tPURST is set to 200ms as factory default.
2. Watch Dog Timer bits are shipped disabled.
Writing to the Control Registers
Changing any of the nonvolatile bits of the control and
trickle registers requires the following steps:
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
– Write a 02H to the Control Register to set the Write
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).
7
6
5
4
3
2
1
0
– Write a 06H to the Control Register to set the
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).
LV1F LV2F LV3F WDF MRF
0
0
0
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.
– Write one byte value to the Control Register that has
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
There is no need to set the WEL or RWEL in the
control register to access this FDR.
Figure 7. Valid Data Changes on the SDA Bus
SCL
SDA
Data Stable
Data Change
Data Stable
FN8251.0
8
July 29, 2005
X40430, X40431, X40434, X40435
At power-up, the FDR is defaulted to all “0”. The sys-
SERIAL INTERFACE
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
perform 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.
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 fam-
ily operate as slaves in all applications.
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.
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.
MRF, Manual Reset Fail Bit (Volatile)
The MRF bit will be set to “0” when Manual Reset
input goes active.
Serial Start Condition
WDF, Watchdog Timer Fail Bit (Volatile)
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.
The WDF bit will be set to “0” when the WDO goes
active.
LV1F, Low V Reset Fail Bit (Volatile)
CC
The LV1F bit will be set to “0” when V
(V1MON)
CC
falls below V
.
TRIP1
Serial Stop Condition
LV2F, Low V2MON Reset Fail Bit (Volatile)
The LV2F bit will be set to “0” when V2MON falls
below V
All communications must be terminated by a stop con-
dition, 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.
.
TRIP2
LV3F, Low V3MON Reset Fail Bit (Volatile)
The LV3F bit will be set to “0” when the V3MON falls
below V
.
TRIP3
Figure 8. Valid Start and Stop Conditions
SCL
SDA
Start
Stop
FN8251.0
9
July 29, 2005
X40430, X40431, X40434, X40435
Serial Acknowledge
detected. The master must then issue a stop condition
to return the device to Standby mode and place the
device into a known state.
Acknowledge is a software convention used to indi-
cate successful data transfer. The transmitting device,
either master or slave, will release the bus after trans-
mitting eight bits. During the ninth clock cycle, the
receiver will pull the SDA line LOW to acknowledge
that it received the eight bits of data. See Figure 9.
Serial Write Operations
Byte Write
For a write operation, the device requires the Slave
Address Byte and a Word Address Byte. This gives
the master access to any one of the words in the
array. After receipt of the Word Address Byte, the
device responds with an acknowledge, and awaits the
next eight bits of data. After receiving the 8 bits of the
Data Byte, the device again responds with an
acknowledge. The master then terminates the transfer
by generating a stop condition, at which time the
device begins the internal write cycle to the nonvolatile
memory. During this internal write cycle, the device
inputs are disabled, so the device will not respond to any
requests from the master. The SDA output is at high
impedance. See Figure 10.
The device will respond with an acknowledge after
recognition of a start condition and if the correct
Device Identifier and Select bits are contained in the
Slave Address Byte. If a write operation is selected,
the device will respond with an acknowledge after the
receipt of each subsequent eight bit word. The device
will acknowledge all incoming data and address bytes,
except for the Slave Address Byte when the Device
Identifier and/or Select bits are incorrect.
In the read mode, the device will transmit eight bits of
data, release the SDA line, then monitor the line for an
acknowledge. If an acknowledge is detected and no
stop condition is generated by the master, the device
will continue to transmit data. The device will terminate
further data transmissions if an acknowledge is not
A write to a protected block of memory will suppress
the acknowledge bit.
Figure 9. Acknowledge Response From Receiver
SCL from
Master
1
8
9
Data Output from
Transmitter
Data Output
from Receiver
Start
Acknowledge
Figure 10. Byte Write Sequence
S
t
a
r
t
S
t
o
p
Signals from
Byte
Address
Slave
the Master
Address
Data
SDA Bus
0
A
C
K
A
C
K
A
C
K
Signals from
the Slave
FN8251.0
10
July 29, 2005
X40430, X40431, X40434, X40435
Page Write
Stops and Write Modes
The device is capable of a page write operation. It is
initiated in the same manner as the byte write opera-
tion; but instead of terminating the write cycle after the
first data byte is transferred, the master can transmit
an unlimited number of 8-bit bytes. After the receipt of
each byte, the device will respond with an acknowl-
edge, and the address is internally incremented by
one. The page address remains constant. When the
counter reaches the end of the page, it “rolls over” and
goes back to ‘0’ on the same page.
Stop conditions that terminate write operations must
be sent by the master after sending at least 1 full data
byte plus the subsequent ACK signal. If a stop is
issued in the middle of a data byte, or before 1 full
data byte plus its associated ACK is sent, then the
device will reset itself without performing the write. The
contents of the array will not be effected.
Acknowledge Polling
The disabling of the inputs during high voltage cycles
can be used to take advantage of the typical 5ms write
cycle time. Once the stop condition is issued to indi-
cate the end of the master’s byte load operation, the
device initiates the internal high voltage cycle.
Acknowledge polling can be initiated immediately. To
do this, the master issues a start condition followed by
the Slave Address Byte for a write or read operation. If
the device is still busy with the high voltage cycle then
no ACK will be returned. If the device has completed
the write operation, an ACK will be returned and the
host can then proceed with the read or write operation.
See Figure 13.
This means that the master can write 16 bytes to the
page starting at any location on that page. If the mas-
ter begins writing at location 10, and loads 12 bytes,
then the first 6 bytes are written to locations 10
through 15, and the last 6 bytes are written to locations
0 through 5. Afterwards, the address counter would
point to location 6 of the page that was just written. If
the master supplies more than 16 bytes of data, then
new data overwrites the previous data, one byte at a
time.
The master terminates the Data Byte loading by issuing
a stop condition, which causes the device to begin the
nonvolatile write cycle. As with the byte write operation,
all inputs are disabled until completion of the internal
write cycle. See Figure 11 for the address, acknowl-
edge, and data transfer sequence.
Serial Read Operations
Read operations are initiated in the same manner as
write operations with the exception that the R/W bit of
the Slave Address Byte is set to one. There are three
basic read operations: Current Address Reads, Ran-
dom Reads, and Sequential Reads.
Figure 11. Page Write Operation
(1 ≤ n ≤ 16)
S
S
t
o
p
t
a
r
Signals from
the Master
Byte
Address
Slave
Address
Data
(1)
Data
(n)
t
SDA Bus
1 0 1 0 0 0
0
A
C
K
A
C
K
A
C
K
A
C
K
Signals from
the Slave
Figure 12. Writing 12 bytes to a 16-byte page starting at location 10.
7 Bytes
5 Bytes
address pointer
ends here
Addr = 7
address
10
address
= 6
address
n-1
FN8251.0
11
July 29, 2005
X40430, X40431, X40434, X40435
Current Address Read
Random Read
Internally the device contains an address counter that
maintains the address of the last word read incre-
mented by one. Therefore, if the last read was to
address n, the next read operation would access data
from address n+1. On power-up, the address of the
address counter is undefined, requiring a read or write
operation for initialization.
Random read operation allows the master to access any
memory location in the array. Prior to issuing the Slave
Address Byte with the R/W bit set to one, the master
must first perform a “dummy” write operation. The master
issues the start condition and the Slave Address Byte,
receives an acknowledge, then issues the Word Address
Bytes. After acknowledging receipts of the Word Address
Bytes, the master immediately issues another start con-
dition and the Slave Address Byte with the R/W bit set to
one. This is followed by an acknowledge from the device
and then by the eight bit word. The master terminates the
read operation by not responding with an acknowledge
and then issuing a stop condition. See Figure 16 for the
address, acknowledge, and data transfer sequence.
Upon receipt of the Slave Address Byte with the R/W
bit set to one, the device issues an acknowledge and
then transmits the eight bits of the Data Byte. The
master terminates the read operation when it does not
respond with an acknowledge during the ninth clock
and then issues a stop condition. See figure 15 for the
address, acknowledge, and data transfer sequence.
A similar operation called “Set Current Address” where
the device will perform this operation if a stop is issued
instead of the second start shown in Figure 15. The
device will go into standby mode after the stop and all
bus activity will be ignored until a start is detected.
This operation loads the new address into the address
counter. The next Current Address Read operation will
read from the newly loaded address. This operation
could be useful if the master knows the next address it
needs to read, but is not ready for the data.
Figure 13. Acknowledge Polling Sequence
Byte Load Completed
by Issuing STOP.
Enter ACK Polling
Issue START
Issue Slave Address
Issue STOP
Sequential Read
Byte (Read or Write)
Sequential reads can be initiated as either a current
address read or random address read. The first Data
Byte is transmitted as with the other modes; however,
the master now responds with an acknowledge, indicat-
ing it requires additional data. The device continues to
output data for each acknowledge received. The master
terminates the read operation by not responding with an
acknowledge and then issuing a stop condition.
NO
ACK
Returned?
YES
High Voltage Cycle
Complete. Continue
Command Sequence?
Issue STOP
The data output is sequential, with the data from
address n followed by the data from address n + 1. The
address counter for read operations increments through
all page and column addresses, allowing the entire
memory contents to be serially read during one opera-
tion. At the end of the address space the counter “rolls
over” to address 0000h and the device continues to out-
put data for each acknowledge received. See Figure 17
for the acknowledge and data transfer sequence.
NO
YES
Continue Normal
Read or Write
Command Sequence
PROCEED
It should be noted that the ninth clock cycle of the read
operation is not a “don’t care.” To terminate a read
operation, the master must either issue a stop condi-
tion during the ninth cycle or hold SDA HIGH during
the ninth clock cycle and then issue a stop condition.
FN8251.0
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July 29, 2005
X40430, X40431, X40434, X40435
SERIAL DEVICE ADDRESSING
– last bit of the slave command byte is a R/W bit. The
R/W bit of the Slave Address Byte defines the oper-
ation to be performed. When the R/W bit is a one,
then a read operation is selected. A zero selects a
write operation.
Memory Address Map
CR, Control Register, CR7: CR0
Address: 1FF
hex
FDR, Fault DetectionRegister, FDR7: FDR0
Address: 0FF
Word Address
hex
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.
General Purpose Memory Organization, A8:A0
Address: 000h to 1FFh
General Purpose Memory Array Configuration
Operational Notes
Memory Address
A8:A0
The device powers-up in the following state:
000h
– The device is in the low power standby state.
Lower 256 bytes
0FFh
100h
– The WEL bit is set to ‘0’. In this state it is not possi-
ble to write to the device.
Upper 256 bytes
Block Protect Option
1FFh
– SDA pin is the input mode.
– RESET/RESET Signal is active for tPURST
.
Slave Address Byte
Data Protection
Following a start condition, the master must output a
Slave Address Byte. This byte consists of several parts:
The following circuitry has been included to prevent
inadvertent writes:
– a device type identifier that is always ‘101x’. Where
x = 0 is for Array, x = 1 is for Control Register or
Fault Detection Register.
– The WEL bit must be set to allow write operations.
– The proper clock count and bit sequence is required
prior to the stop bit in order to start a nonvolatile
write cycle.
– next two bits are ‘0’.
– next bit that becomes the MSB of the address.
– A three step sequence is required before writing into
the Control Register to change Watchdog Timer or
Block Lock settings.
Figure 14. X40430, X40431, X40434, X40435
Addressing
– The WP pin, when held HIGH, prevents all writes to
the array and all the Register.
Slave Byte
General Purpose Memory
Control Register
1
1
1
0
0
0
1
1
1
0
1
1
0
0
0
0
0
0
R/W
R/W
R/W
A8
1
Fault Detection Register
0
Word Address
General Purpose Memory
Control Register
A0
1
A7 A6 A5 A4 A3 A2 A1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Fault Detection Register
1
Figure 15. Current Address Read Sequence
.
S
Slave
Address
t
S
t
o
p
Signals from
the Master
a
r
t
SDA Bus
1 0 1 0 0 0
1
A
Signals from
the Slave
C
Data
K
FN8251.0
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July 29, 2005
X40430, X40431, X40434, X40435
Figure 16. Random Address Read Sequence
S
t
S
t
S
t
o
p
Slave
Address
Byte
Address
Slave
Address
Signals from
the Master
a
r
a
r
t
t
SDA Bus
1 0 1 0 0
0
1
A
C
K
A
C
K
A
C
K
Signals from
the Slave
Data
Figure 17. Sequential Read Sequence
S
t
o
p
Slave
Address
Signals from
the Master
A
C
K
A
C
K
A
C
K
SDA Bus
1
A
C
K
Signals from
the Slave
Data
(2)
Data
(n-1)
Data
(1)
Data
(n)
(n is any integer greater than 1)
FN8251.0
July 29, 2005
14
X40430, X40431, X40434, X40435
ABSOLUTE MAXIMUM RATINGS
COMMENT
Temperature under bias.................... -65°C to +135°C
Storage temperature ......................... -65°C to +150°C
Voltage on any pin with
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only; functional operation of the
device (at these or any other conditions above those
listed in the operational sections of this specification) is
not implied. Exposure to absolute maximum rating con-
ditions for extended periods may affect device reliability.
respect to V ...................................... -1.0V to +7V
SS
D.C. output current...............................................5mA
Lead temperature (soldering, 10 seconds)........ 300°C
RECOMMENDED OPERATING CONDITIONS
Temperature
Commercial
Industrial
Min.
0°C
Max.
70°C
Chip Supply
Voltage
Monitored*
Voltages
Version
X40430, X40431
X40434, X40435
2.7V to 5.5V
2.7V to 5.5V
1.7V to 5.5V
1.0V to 5.5V
-40°C
+85°C
*See Ordering Info
D.C. OPERATING CHARACTERISTICS
(Over the recommended operating conditions unless otherwise specified)
(4)
Symbol
Parameter
Min
Typ
Max
1.5
Unit
Test Conditions
(1)
ICC1
Active Supply Current (V ) Read
mA VIL = V x 0.1
CC
CC
(1)
VIH = V x 0.9,
fSCL = 400kHz
ICC2
Active Supply Current (V ) Write
3.0
mA
CC
CC
(1)(6)
ISB1
Standby Current (V ) AC (WDT off)
6
10
µA VIL = V x 0.1
CC
CC
VIH = V x 0.9
CC
fSCL, fSDA = 400kHz
(2)(6)
ISB2
Standby Current (V ) DC (WDT on)
25
30
10
10
µA VSDA = VSCL = VCC
Others = GND or VCC
CC
ILI
Input Leakage Current (SCL, MR,
WP)
µA VIL = GND to V
CC
ILO
Output Leakage Current (SDA,
V2FAIL, V3FAIL, WDO, RESET)
µA
VSDA = GND to V
CC
Device is in Standby(2)
(3)
VIL
Input LOW Voltage (SDA, SCL, MR,
WP)
-0.5
V
x 0.3
V
V
CC
(3)
VIH
Input HIGH Voltage (SDA, SCL, MR,
WP)
V
x 0.7
V
+ 0.5
CC
CC
(6)
VHYS
Schmitt Trigger Input Hysteresis
• Fixed input level
0.2
.05 x V
V
V
• V related level
CC
CC
VOL
Output LOW Voltage (SDA, RE-
SET/RESET, LOWLINE, V2FAIL,
V3FAIL, WDO)
0.4
V
I
OL = 3.0mA (2.7-5.5V)
IOL = 1.8mA (2.7-3.6V)
VOH
Output (RESET, LOWLINE) HIGH
Voltage
V
V
– 0.8
– 0.4
V
I
OH = -1.0mA (2.7-5.5V)
CC
CC
IOH = -0.4mA (2.7-3.6V)
FN8251.0
July 29, 2005
15
X40430, X40431, X40434, X40435
D.C. OPERATING CHARACTERISTICS (Continued)
(Over the recommended operating conditions unless otherwise specified)
(4)
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
VCC Supply
(5)
VTRIP1
V
Trip Point Voltage Range
2.0
4.75
4.65
V
V
CC
4.55
4.6
X40430, X40431-A, X40434,
X40435
4.35
2.85
4.4
2.9
4.45
2.95
V
V
X40430, X40431-B
X40430, X40431-C
Second Supply Monitor
IV2
V2MON Current
15
µA
(5)
VTRIP2
V2MON Trip Point Voltage Range
1.7
0.9
4.75
3.5
V
V
x40430, X40431
x40434, X40435
2.85
2.55
2.15
1.25
0.95
2.9
2.6
2.2
1.3
1.0
2.95
2.65
2.25
1.35
1.05
5
V
V
X40430, X40431-A
X40430, X40431-B
X40430, X40431-C
X40434, X40435-A&B
X40434, X40435-C
V
V
V
(6)
tRPD2
VTRIP2 to V2FAIL
µs
Third Supply Monitor
IV3
V3MON Current
V3MON Trip Point Voltage Range
15
4.75
1.75
3.15
2.95
5
µA
V
(5)
VTRIP3
1.7
1.65
3.05
2.85
1.7
3.1
2.9
V
X40430, X40431
V
X40434, X40435-A
X40434, X40435-B&C
V
(6)
tRPD3
VTRIP3 to V3FAIL
µs
Notes: (1) The device enters the Active state after any start, and remains active until: 9 clock cycles later if the Device Select Bits in the Slave
Address Byte are incorrect; 200ns after a stop ending a read operation; or tWC after a stop ending a write operation.
(2) The device goes into Standby: 200ns after any stop, except those that initiate a high voltage write cycle; tWC after a stop that initiates a high
voltage cycle; or 9 clock cycles after any start that is not followed by the correct Device Select Bits in the Slave Address Byte.
(3) VIL Min. and VIH Max. are for reference only and are not tested.
(4) At 25°C, VCC = 3V
(5) See ordering information for standard programming levels. For custom programmed levels, contact factory.
(6) Based on characterization data.
EQUIVALENT INPUT CIRCUIT FOR VxMON (x = 1, 2, 3)
R
∆V = 100mV
VxMON
∆V
Vref
+
–
Output Pin
VREF
C
tRPDX = 5µs worst case
CAPACITANCE
Symbol
Parameter
Max
Unit
Test Conditions
(1)
COUT
Output Capacitance (SDA, RESET/RESET, LOWLINE,
V2FAIL,V3FAIL, WDO)
8
pF
VOUT = 0V
(1)
CIN
Input Capacitance (SCL, WP, MR)
6
pF
VIN = 0V
Note: (1) This parameter is not 100% tested.
FN8251.0
July 29, 2005
16
X40430, X40431, X40434, X40435
EQUIVALENT A.C. OUTPUT LOAD CIRCUIT FOR
SYMBOL TABLE
V
= 5V
CC
WAVEFORM
INPUTS
OUTPUTS
VCC
5V
V2MON, V3MON
Must be
steady
Will be
steady
4.6kΩ
4.6kΩ
May change
from LOW
to HIGH
Will change
from LOW
to HIGH
2.06kΩ
RESET
WDO
V2FAIL,
V3FAIL
SDA
May change
from HIGH
to LOW
Will change
from HIGH
to LOW
30pF
30pF
30pF
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
A.C. TEST CONDITIONS
N/A
Center Line
is High
Input pulse levels
V
x 0.1 to V x 0.9
Impedance
CC
CC
Input rise and fall times
10ns
Input and output timing levels
Output load
V
x 0.5
CC
Standard output load
A.C. CHARACTERISTICS
Symbol
Parameter
Min
Max
Unit
kHz
ns
µs
µs
µs
µs
µs
µs
ns
µs
µs
ns
ns
ns
µs
µs
pF
fSCL
tIN
SCL Clock Frequency
400
Pulse width Suppression Time at inputs
SCL LOW to SDA Data Out Valid
Time the bus free before start of new transmission
Clock LOW Time
50
tAA
0.1
0.9
tBUF
1.3
tLOW
tHIGH
tSU:STA
tHD:STA
tSU:DAT
tHD:DAT
tSU:STO
tDH
1.3
Clock HIGH Time
0.6
Start Condition Setup Time
Start Condition Hold Time
Data In Setup Time
0.6
0.6
100
Data In Hold Time
0
Stop Condition Setup Time
Data Output Hold Time
0.6
50
20 +.1Cb(1)
20 +.1Cb(1)
0.6
tR
SDA and SCL Rise Time
SDA and SCL Fall Time
WP Setup Time
300
300
tF
tSU:WP
tHD:WP
Cb
WP Hold Time
0
Capacitive load for each bus line
400
Note: (1) Cb = total capacitance of one bus line in pF.
FN8251.0
17
July 29, 2005
X40430, X40431, X40434, X40435
TIMING DIAGRAMS
Bus Timing
tF
tHIGH
tLOW
tR
SCL
tSU:STA
SDA IN
tSU:DAT
tHD:DAT
tSU:STO
tHD:STA
tAA tDH
tBUF
SDA OUT
WP Pin Timing
START
SCL
SDA IN
WP
Clk 1
Clk 9
Slave Address Byte
tSU:WP
tHD:WP
Write Cycle Timing
SCL
8th Bit of Last Byte
ACK
SDA
tWC
Stop
Start
Condition
Condition
Nonvolatile Write Cycle Timing
Symbol
Parameter
Min
Typ
Max
10
Unit
(1)
tWC
Write Cycle Time
5
ms
Note: (1) tWC is the time from a valid stop condition at the end of a write sequence to the end of the self-timed internal nonvolatile write cycle. It is
the minimum cycle time to be allowed for any nonvolatile write by the user, unless Acknowledge Polling is used.
FN8251.0
18
July 29, 2005
X40430, X40431, X40434, X40435
Power Fail Timings
tR
VTRIPX
VCC
tRPDL
tRPDX
tRPDL
tRPDX
V2MON or
[ ]
V3MON
tRPDL
tRPDX
tF
LOWLINE or
V2FAIL or
[ ]
VRVALID
V3FAIL
X = 2, 3
RESET/RESET/MR Timings
VTRIP1
VCC
tPURST
tPURST
tRPD1
tF
tR
RESET
VRVALID
RESET
MR
tMD
tIN1
LOW VOLTAGE AND WATCHDOG TIMINGS PARAMETERS (@25°C, V = 5V)
CC
Symbol
Parameters
Min Typ (1)
Max
Unit
(2)
tRPD1
VTRIP1 to RESET/RESET (Power-down only)
VTRIP1 to LOWLINE
5
µs
tRPDL
t LR
LOWLINE to RESET/RESET delay (Power-down only) [= tRPD1-tRPDL
]
500
ns
µs
(2)
tRPDX
VTRIP2 to V2FAIL, or VTRIP3 to V3FAIL (x = 2, 3)
5
tPURST
Power-on Reset delay:
PUP1 = 0, PUP0 = 0
PUP1 = 0, PUP0 = 1 (factory setting)
PUP1 = 1, PUP0 = 0
50(2)
200
ms
ms
ms
ms
400(2)
800(2)
PUP1 = 1, PUP0 = 1
tF
VCC, V2MON, V3MON, Fall Time
VCC, V2MON, V3MON, Rise Time
20
20
1
mV/µs
mV/µs
V
tR
VRVALID Reset Valid VCC
(2)
tMD
MR to RESET/ RESET delay (activation only)
500
ns
FN8251.0
19
July 29, 2005
X40430, X40431, X40434, X40435
LOW VOLTAGE AND WATCHDOG TIMINGS PARAMETERS (@25°C, V
= 5V) (CONTINUED)
CC
Symbol
tin1
Parameters
Min Typ (1)
Max
Unit
Pulse width for MR
5
µs
tWDO
Watchdog Timer Period:
WD1 = 0, WD0 = 0
WD1 = 0, WD0 = 1
WD1 = 1, WD0 = 0
1.4(2)
200(2)
25
s
ms
ms
WD1 = 1, WD0 = 1 (factory setting)
OFF
tRST1
Watchdog Reset Time Out Delay
WD1 = 0, WD0 = 0
100
200
300
ms
WD1 = 0, WD0 = 1
tRST2
tRSP
Watchdog Reset Time Out Delay WD1 = 1, WD0 = 0
Watchdog timer restart pulse width
12.5
1
25
37.5
ms
µs
Notes: (1) VCC = 5V at 25°C.
(2) Values based on characterization data only.
Watchdog Time Out For 2-Wire Interface
Start
Start
Clockin (0 or 1)
tRSP
< tWDO
SCL
SDA
tRST
tWDO
tRST
WDO
WDT
Restart
Start
Minimum Sequence to Reset WDT
SCL
SDA
FN8251.0
20
July 29, 2005
X40430, X40431, X40434, X40435
V
Set/Reset Conditions
TRIPX
(VTRIPX
)
VCC/V2MON/V3MON
tTHD
VP
tTSU
WDO
tVPS
tVPO
tVPH
7
SCL
SDA
0
0
7
0
7
*
tWC
A0h
00h
Start
resets VTRIP1
resets VTRIP2
*0Fh resets VTRIP3
*01h
*09h
*0Dh
*03h
*0Bh
sets VTRIP1
sets VTRIP2
sets VTRIP3
* all others reserved
V
, V
, V
Programming Specifications: V = 2.0 - 5.5V; Temperature = 25°C
TRIP1
TRIP2
TRIP3
CC
Parameter
tVPS
Description
Min.
Max. Unit
WDO Program Voltage Setup time
WDO Program Voltage Hold time
VTRIPX Level Setup time
10
10
10
10
10
1
µs
µs
tVPH
tTSU
µs
tTHD
VTRIPX Level Hold (stable) time
µs
tWC
VTRIPX Program Cycle
ms
ms
tVPO
Program Voltage Off time before next cycle
Programming Voltage
VP
15
2.0
1.7
0.9
1.7
-25
10
18
V
V
VTRAN1
VTRAN2
VTRAN2A
VTRAN3
Vtv
VTRIP1 Set Voltage Range
4.75
4.75
3.5
VTRIP2 Set Voltage Range – X40430, X40431
VTRIP2 Set to Voltage Range – X40434, X40435
VTRIP3 Set Voltage Range
V
V
4.75
+25
V
VTRIPX Set Voltage variation after programming (-40 to +85°C).
WDO Program Voltage Setup time
mV
µs
tVPS
FN8251.0
21
July 29, 2005
X40430, X40431, X40434, X40435
PACKAGING INFORMATION
14-Lead Plastic Small Outline Gullwing Package Type S
0.150 (3.80) 0.228 (5.80)
0.158 (4.00) 0.244 (6.20)
Pin 1 Index
Pin 1
0.014 (0.35)
0.020 (0.51)
0.336 (8.55)
0.345 (8.75)
(4X) 7°
0.053 (1.35)
0.069 (1.75)
0.004 (0.10)
0.010 (0.25)
0.050 (1.27)
0.050"Typical
0.010 (0.25)
X 45°
0.020 (0.50)
0.050"Typical
0° – 8°
0.250"
0.0075 (0.19)
0.010 (0.25)
0.016 (0.410)
0.037 (0.937)
0.030"Typical
14 Places
FOOTPRINT
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
FN8251.0
22
July 29, 2005
X40430, X40431, X40434, X40435
PACKAGING INFORMATION
14-Lead Plastic, TSSOP, Package Type V
.025 (.65) BSC
.169 (4.3)
.177 (4.5)
.252 (6.4) BSC
.193 (4.9)
.200 (5.1)
.047 (1.20)
.0075 (.19)
.0118 (.30)
.002 (.05)
.006 (.15)
.010 (.25)
Gage Plane
0° - 8°
Seating Plane
.019 (.50)
.029 (.75)
Detail A (20X)
.031 (.80)
.041 (1.05)
See Detail “A”
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
FN8251.0
23
July 29, 2005
X40430, X40431, X40434, X40435
ORDERING INFORMATION
Monitored
Operating
V
V
V
V
TRIP3
Temperature Part Number Part Number
CC
TRIP1
TRIP2
Supplies
Range
Range
Range
Package
Range
with RESET
with RESET
1.7-5.5
4.6V±50mV 2.9V±50mV 1.7V±50mV
4.4V±50mV 2.6V±50mV 1.7V±50mV
2.9V±50mV 2.2V±50mV 1.7V±50mV
4.6V±50mV 1.3V±50mV 3.1V±50mV
4.6V±50mV 1.3V±50mV 2.9V±50mV
4.6V±50mV 1.0V±50mV 2.9V±50mV
14L SOIC
0°C–70°C
X40430S14-A X40431S14-A
-40°C–85°C X40430S14I-A X40431S14I-A
0°C–70°C X40430V14-A X40431V14-A
-40°C–85°C X40430V14I-A X40431V14I-A
0°C–70°C X40430S14-B X40431S14-B
-40°C–85°C X40430S14I-B X40431S14I-B
0°C–70°C X40430V14-B X40431V14-B
-40°C–85°C X40430V14I-B X40431V14I-B
0°C–70°C X40430S14-C X40431S14-C
-40°C–85°C X40430S14I-C X40431S14I-C
0°C–70°C X40430V14-C X40431V14-C
-40°C–85°C X40430V14I-C X40431V14I-C
0°C–70°C X40434S14-A X40435S14-A
-40°C–85°C X40434S14I-A X40435S14I-A
0°C–70°C X40434V14-A X40435V14-A
-40°C–85°C X40434V14I-A X40435V14I-A
0°C–70°C X40434S14-B X40435S14-B
-40°C–85°C X40434S14I-B X40435S14I-B
0°C–70°C X40434V14-B X40435V14-B
-40°C–85°C X40434V14I-B X40435V14I-B
0°C–70°C X40434S14-C X40435S14-C
-40°C–85°C X40434S14I-C X40435S14I-C
0°C–70°C X40434V14-C X40435V14-C
-40°C–85°C X40434V14I-C X40435V14I-C
14L TSSOP
14L SOIC
1.7-5.5
1.7-3.6
1.3-5.5
1.3-5.5
1.0-5.5
14L TSSOP
14L SOIC
14L TSSOP
14L SOIC
14L TSSOP
14L SOIC
14L TSSOP
14L SOIC
14L TSSOP
PART MARK INFORMATION
14-Lead Package
0/1/4/5
X4043XX
YYWWXX
Package - S/V
A, B, or C
I – Industrial
Blank – Commercial
WW – Workweek
YY – Year
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN8251.0
24
July 29, 2005
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